List of auxiliary Interstate Highways

Dwight D. Eisenhower National System of Interstate and Defense Highways
	Highway shield for Interstate 295
	Interstate Highways in the 48 contiguous states
System information
Formed	June 29, 1956[1]
Highway names
Interstates	Interstate X (I-X)
System links
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future;

The auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards (with rare exceptions), they receive the same percentage of federal funding (90%), and they comply with other federal standards.

Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat these as bypasses.

These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer interstates may have many such supplemental routes, the numbers may repeat from state to state along their route, but they will not repeat within a state.

Terminology and guidelines

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used.

Spur route

A spur route's number usually has an odd number for its first digit.^[2] It is usually one of the following:

It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street/avenue or at a substandard freeway, such as I-180 in Lincoln, Nebraska.
It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
It may connect two unrelated Interstate highways—such as I-390 in New York State and I-355 in Illinois do.
- Note that states differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.

Examples include:

I-110 in California links I-10 with the Port of Los Angeles. This freeway was built before Interstate Highways as the Harbor Freeway. Later, it was adopted into the Interstate Highway System.
I-180 in North-Central Pennsylvania connects Williamsport and Lycoming County with I-80 in Milton, which does not actually enter Lycoming County. I-180 also serves as a connection to those traveling to New York and I-86 via U.S. Route 15 and the Future I-99 Corridor at its western terminus.
I-190 in New York connects the cities of Niagara Falls and Buffalo with I-90.

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples include:

I-380 in Northern California is located at the San Francisco Bay Area. This highway begins at I-280, and it connects with US 101 and San Francisco International Airport.
I-190 in Massachusetts branches off from I-290 near Worcester.
I-795 in Baltimore County, Maryland branches off from I-695.

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.^[2]

Examples include:

I-215 in Utah travels part of the perimeter of Salt Lake City.
I-220 in Louisiana serves as a bypass of downtown Shreveport.
I-440 forms a loop around the south side of Nashville.

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini; however, they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.^[2]

Some examples of beltways include:

I-275 in Ohio, Kentucky and Indiana encircles the city of Cincinnati.
I-465 in Indiana encircles the city of Indianapolis.
I-495 in Maryland and Virginia encircles the city of Washington, D.C. and is referred to as "The Capital Beltway".

Auxiliary Interstates

Note: the table sorts the route numbers by parent highway.

Number	Length (mi)^[3]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
01Hawaii-2 !H-201	4.10	6.60	H-1 in Halawa, HI	H-1 in Honolulu, HI	01989-01-011989^[4]	current	Signed as Route 78 until 2004
05California-1 !I-105	17.32	27.87	SR 1 in El Segundo, CA	I-605 in Norwalk, CA	01963-01-011963	current	Replaced segments of SR 42
05California-2 !I-205	12.97	20.87	I-580 near Tracy, CA	I-5 near Tracy, CA	01970-01-011970	current
05California-3 !I-305	6.00	9.66	I-80 in West Sacramento, CA	I-80 Bus/US 50/SR 99 in Sacramento, CA	01981-01-011981	current	Unsigned
05California-4 !I-405	72.15	116.11	I-5 in Irvine, CA	I-5 in Mission Hills, CA	01964-01-011964	current
05California-5 !I-505	32.98	53.08	I-80 in Vacaville, CA	I-5 in Dunnigan, CA	01977-01-011977	current	Originally part of I-5W
05California-6 !I-605	27.40	44.10	I-405 in Seal Beach, CA	I-210 in Irwindale, CA	01964-01-011964	current
05California-8 !I-805	28.02	45.09	I-5 in San Ysidro, CA	I-5 in Sorrento Valley, CA	01959-01-011959	current
05California-9 !I-905	8.96^[5]	14.42	I-5 in San Ysidro, CA	Fed. 2 at the United States-Mexico border in Otay Mesa, CA	proposed	—	Currently SR 905, proposed to be signed as an Interstate
05OR-1 !I-105	3.49	5.62	OR 99 in Eugene, OR	I-5 in Springfield, OR	02011-01-012011	current
05OR-4 !I-405	3.53	5.68	I-5 in Portland, OR	I-5 in Portland, OR	—	—
05Washington-2 !I-205	36.64	58.97	I-5 in Tualatin, OR	I-5 in Salmon Creek, WA	01975-01-011975	current
0WA5-4 !I-405	30.30	48.76	I-5/SR 518 in Tukwila, WA	I-5/SR 525 in Lynnwood, WA	01964-01-011964	current
05Washington-6 !I-605	—	—	—	—	proposed	—	Proposed to bypass Seattle, WA
05Washington-7 !I-705	1.50	2.41	I-5/SR 7 in Tacoma, WA	—	01990-01-011990	current	Schuster Parkway in Tacoma
10-2 !I-210	—	—	I-10 in Mobile, AL (original southern terminus)	I-65 in Prichard, AL	—	—	Currently I-165, the route number was decommissioned because it had no connection to I-10
10-4 !I-410	—	—	I-10/I-17 in Phoenix, AZ	I-10 in Phoenix, AZ	—	—	Now part of I-10 in Phoenix, AZ
10-5 !I-510	—	—	I-10/SR 51 in Phoenix, AZ	SR 101 in Phoenix, AZ	—	—	Currently designated as SR 51 (Piestewa Freeway)
10-7 !I-710	—	—	I-10 in Tucson, AZ	North Campbell Avenue/East 6th Street in Tucson, AZ	—	—	Mostly never built freeway that was to connect to University of Arizona campus from I-10
10California-1 !I-110	20.43	32.88	SR 47 in San Pedro, CA	I-10/SR 110 in Los Angeles, CA	01978-01-011978	current	Originally part of US 66, then signed as SR 11
10California-2 !I-210	48.72	78.41	I-5 in Sylmar, CA	SR 57/SR 210 in Glendora, CA	01964-01-011964	current	Segment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
10California-7 !I-710	19.66	31.64	Terminal Island in Long Beach, CA	Valley Boulevard in Alhambra, CA	01983-01-011983	current	Originally signed as SR 7
10Florida-1 !I-110	6.94	11.17	US 98 Bus. near Pensacola, FL	I-10 near Pensacola, FL	01969-01-011969	current
10Louisiana-1 !I-110	8.89	14.31	I-10 in Baton Rouge, LA	US 61 in Baton Rouge, LA	01964-01-011964	current
10Louisiana-2 !I-210	12.40	19.96	I-10 west of Lake Charles, LA	I-10 east of Lake Charles, LA	01964-01-011964	current
10Louisiana-3 !I-310	11.25	18.11	US 90/LA 3127 in Boutte, LA	I-10 west of Kenner, LA	01983-01-011983	current
10Louisiana-3 !I-310	2.70	4.35	US 90 Bus. in New Orleans, LA	I-10 in New Orleans, LA	01964-01-011964	01969-01-011969	Cancelled Vieux Carré Riverfront Expressway
10Louisiana-4 !I-410	1.90	3.06	LA 67 in Baton Rouge, LA	I-10 in Baton Rouge, LA	01961-01-011961	01964-01-011964	Renumbered as I-110
10Louisiana-4 !I-410	—	—	I-10 west of New Orleans, LA	I-10 in New Orleans, LA	01969-01-011969	01977-01-011977	Cancelled southern bypass of New Orleans
10Louisiana-5 !I-510	3.04	4.89	LA 47 in New Orleans, LA	I-10/LA 47 in New Orleans, LA	01992-01-011992	current
10Louisiana-6 !I-610	4.52	7.27	I-10 at Metairie–New Orleans, LA, line	I-10 in New Orleans, LA	01965-01-011965	current
10Louisiana-9 !I-910	9.70	15.61	US 90 Bus. in Marrero, LA	I-10/US 90 Bus. in New Orleans, LA	01999-01-011999	current	Signed as part of US 90 Bus. and Future I-49
10Mississippi-1 !I-110	4.10	6.60	US 90 in Biloxi, MS	I-10 in D'Iberville, MS	01988-01-011988	current
10Mississippi-3 !I-310	—	—	US 90 near the Port of Gulfport, MS	I-10 in Gulfport, MS	proposed	—	Future spur into Gulfport, MS
10Texas-1 !I-110	0.92	1.48	Av Abraham Lincoln at the United States-Mexico border in El Paso, TX	I-10 in El Paso, TX	01967-01-011967	current	Shortest signed Interstate in the country
10Texas-4 !I-410	49.49	79.65	Beltway around San Antonio, TX		01959-01-011959	current
10Texas-6 !I-610	37.97	61.11	Beltway around Houston, TX		01975-01-011975	current
15California-2 !I-215	54.50	87.71	I-15 in Murrieta, CA	I-15 in Devore, CA	01982-01-011982	current	Originally signed as I-15E, then SR 215
15Montana-1 !I-115	1.19	1.92	I-15/I-90 in Butte, MT	Iron Street in Butte, MT	01971-01-011971	current
15Montana-3 !I-315	0.83	1.34	I-15 in Great Falls, MT	I-15 Bus/US 89 in Great Falls, MT	01960-10-201960	current	Unsigned
15Nevada-2 !I‑215	11.10	17.86	I-15/Clark County Route 215 near Paradise, NV	I-515/US 93/SR 564 in Henderson, NV	01996-01-011996	current
15Nevada-5 !I‑515	20.54	33.06	US 93/US 95 in Henderson, NV	I-15/US 93/US 95 in Las Vegas, NV	01976-01-011976	current	Not signed until 1994, this route is entirely concurrent with US 93/US 95
15Utah-2 !I-215	29.02	46.70	I-80 in Salt Lake City, UT	I-15 in North Salt Lake, UT	01963-01-011963	current
15Utah-2 !I-415	2.39	3.85	I-80 in Salt Lake City, UT	4430 S in Holladay, Utah	01965-01-011965	01969-01-011969	Designation was scrapped to provide a single route number 215 for the entire route.
16Georgia-5 !I-516	6.49	10.44	SR 21/SR 204 in Savannah, GA	SR 21 in Garden City, GA	01985-01-011985	current
20Georgia-4 !I-420	5.40	8.69	I-285 in College Park, GA	I-20 in Atlanta, GA	01983-01-011983	01986-01-011986	Never built, was planned to bypass Atlanta, GA
20Georgia-5 !I-520	16.14	25.97	I-20 in Augusta, GA	I-20 in North Augusta, SC	01980-01-011980	current
20Louisiana-2 !I-220	17.62	28.36	I-20/LA 3132 in Shreveport, LA	I-20 in Bossier City, LA	01979-01-011979	current
20Louisiana-4 !I-420	10.20	16.42	I-20 in West Monroe, LA	I-20 in Monroe, LA	01957-01-011957	01964-01-011964	Cancelled bypass of Monroe
20Mississippi-2 !I-220	12.01	19.33	I-20 in Jackson, MS	I-55 in Ridgeland, MS	01981-01-011981	current
20Texas-8 !I-820	35.17	56.60	I-20 in Fort Worth, TX	I-20/US 287 in Fort Worth, TX	01959-01-011959	current
22Alabama-2 !I-222	—	—	I-22 near Birmingham, AL	I-422 near Birmingham, AL	proposed	—
22Alabama-4 !I-422	—	—	I-20/I-59/I-459/US 11 in Bessemer, AL	I-59 in Argo, AL	proposed	—	If built, it will have no direct connections to I-22.
24Tennessee-1 !I-124	1.97	3.17	I-24 in Chattanooga, TN	US 27 in Chattanooga, TN	01960-01-011960	current	Unsigned
25Colorado-2 !I-225	12.00	19.31	I-25 in Denver, CO	I-70 in Aurora, CO	01976-01-011976	current
26South Carolina-1 !I-126	3.68	5.92	I-26 in Columbia, SC	US 21/US 76/US 176/US 321 in Columbia, SC	01961-01-011961	current
26South Carolina-3 !I-326	5.24	8.43	I-26 in Cayce, SC	SC 48 in Columbia, SC	01976-01-011976	01995-01-011995	Now part of I-77, formerly unsigned
26South Carolina-5 !I-526	19.26	31.00	US 17 in Charleston, SC	I-526 Bus./US 17 in Mount Pleasant, SC	01989-01-011989	current
29Iowa-1 !I-129	3.48	5.60	US 20/US 75/US 77 in South Sioux City, NE	I-29/US 20/US 75 in Sioux City, IA	01976-01-011976	current
29Missouri-2 !I-229	14.97	24.09	I-29 in St. Joseph, MO	I-29/US 59/US 71 in St. Joseph, MO	01986-01-011986	current
29South Dakota-2 !I-229	11.33	18.23	I-29 in Sioux Falls, SD	I-90 near Sioux Falls, SD	01966-01-011966	current
30Arkansas-1 !I-130	5	8	I-30/I-49 in Texarkana, AR	US 59/US 71 near Texarkana, AR	02000-01-012000	02014-01-012014	Now part of I-49
30Arkansas-4 !I-430	12.93	20.81	I-30/US 67 in Little Rock, AR	I-40/US 65 in Little Rock, AR	01980-01-011980	current
30Arkansas-5 !I-530	46.65	75.08	US 65 in Pine Bluff, AR	I-30/I-440 in Little Rock, AR	01999-01-011999	current
30Arkansas-6 !I-630	7.40	11.91	I-430 near Little Rock, AR	I-30 in Little Rock, AR	01985-01-011985	current
35Iowa-2 !I-235	13.78	22.18	I-35/I-80 in West Des Moines, IA	I-35/I-80 near Des Moines, IA	01961-01-011961	current
35Kansas-1 !I-135	95.74	154.08	Kansas Turnpike/I-35 in Wichita, KS	I-70/US 81 in Salina, KS	01976-01-011976	current
35Kansas-2 !I-235	16.52	26.59	I-135/US 81 in Wichita, KS	I-135/US 81/K-15/K-254 in Wichita, KS	01965-01-011965	current
35Kansas-3 !I-335	50.13	80.68	I-35/Kansas Turnpike/US 50 in Emporia, KS	I-470/Kansas Turnpike in Topeka, KS	01987-01-011987	current
35Kansas-4 !I-435	80.81	130.05	Beltway around Kansas City, KS, and Kansas City, MO		01965-01-011965	current
35Kansas-6 !I-635	8.90	14.32	I-35 in Overland Park, KS	I-29/US 71 in Kansas City, MO	01968-01-011968	current
35Minnesota 3 !I-335	2.74^[6]	4.41	I-94 in Minneapolis, MN	I-35W in Minneapolis, MN	01964-01-011964	01978-01-011978	Cancelled
35Minnesota-5 !I-535	2.78	4.47	I-35/US 53 in Duluth, MN	US 53/WIS 35 in Superior, WI	01971-01-011971	current
35Oklahoma-2 !I-235	5.36	8.63	I-35/I-40 in Oklahoma City, OK	I-44 in Oklahoma City, OK	01989-01-011989	current
35Texas-6 !I-635	37.00	59.55	SH 121 in Grapevine, TX	I-20 in Balch Springs, TX	01959-01-011959	current
38-2 !I-238	2.23	3.59	I-880 in San Leandro, CA	I-580/SR 238 in Castro Valley, CA	01983-01-011983	current	Considered an auxiliary route of I-80 in California; there is no I-38
40Arkansas-4 !I-440	9.96	16.03	I-30/I-530 near Little Rock, AR	I-40/AR 440 near Little Rock, AR	02003-01-012003	current
40Arkansas-5 !I-540	15.87	25.54	US 271/AR 253 near Fort Smith, AR	I-40 in Van Buren, AR	01965-01-011965	current
40North Carolina-1 !I-140	6.79	10.93	US 17 near Winnabow, NC	I-40/US 17 in Wilmington, NC	02008-01-012008	current
40North Carolina-2 !I-240	9.54	15.35	I-26/I-40/US 74 near Asheville, NC	I-40/US 74A in Asheville, NC	01980-01-011980	current
40North Carolina-4 !I-440	16.77	26.99	I-40/US 1/US 64 near Cary, NC	I-40 near Raleigh, NC	01991-01-011991	current
40North Carolina-5 !I-540	25.84	41.59	I-40 near Durham, NC	I-87/US 64/US 264 near Knightdale, NC	01997-01-011997	current
40North Carolina-8 !I-840	5.77	9.29	I-40/I-73/US 421 in Greensboro, NC	I-40/I-85/I-785/I-85 Bus. in Greensboro, NC	02011-01-012011	current
40Oklahoma-2 !I-240	16.22	26.10	I-44/US 62 in Oklahoma City, OK	I-40/US 270 in Oklahoma City, OK	01965-01-011965	current
40-4 !I-440	9.96	16.03	I-40/I-240 near Oklahoma, OK	I-35 in Oklahoma City, OK	—	—	Now part of I-44
40Tennessee-1 !I-140	11.17	17.98	I-40 near Farragut, TN	US 129 near Alcoa, TN	01987-01-011987	current
40Tennessee-2 !I-240	19.27	31.01	I-40 in Memphis, TN	I-40 in Memphis, TN	01970-01-011970	current
40Tennessee-4 !I-440	7.64	12.30	I-40 in Nashville, TN	I-24 in Nashville, TN	01987-01-011987	current
40Tennessee-6 !I-640	7.03	11.31	I-40 in Knoxville, TN	I-40 in Knoxville, TN	01982-01-011982	current
40Tennessee-8 !I-840	77.28^[7]	124.37	I-40 near Dickson, TN	I-40 near Lebanon, TN	02016-01-012016	current
44Oklahoma-2 !I-244	15.75	25.35	I-44 in Tulsa, OK	I-44 in Tulsa, OK	01970-01-011970	current
44Oklahoma-4 !I-444	2.51	4.04	I-244 in Tulsa, OK	I-244 in Tulsa, OK	01970-01-011970	current	Unsigned
45-3 !I-345	1.40	2.25	I-30/I-45 in Dallas, TX	US 75 in Dallas, TX	01973-01-011973	current	Unsigned
55Arkansas-5 !I-555	49.80	80.15	I-55 in Turrell, AR	AR 91 in Jonesboro, AR	02016-01-012016	current
55Illinois-1 !I-155	32.13	51.71	I-74 in Morton, IL	I-55 in Lincoln, IL	01992-01-011992	current
55Illinois-2 !I-255	30.82	49.60	I-55/I-270 in Mehlville, MO	I-270/IL 255 in Pontoon Beach, IL	01986-01-011986	current
55Illinois-3 !I-355	32.51	52.32	I-80 in New Lenox, IL	I-290 in Itasca, IL	01989-01-011989	current
55Tennessee-1 !I-155	15.93	25.64	I-55 near Hayti, MO	US 51 at Dyersburg, TN	01980-01-011980	current
55Tennessee-2 !I-255	—	—	I-55/I-240 in Memphis, TN	I-40 in Memphis, TN	—	—	Now part of I-55 and I-240
59Alabama-3 !I-359	2.30	3.70	I-20/I-59 in southern Tuscaloosa, AL	15th Street in downtown Tuscaloosa, AL	01983-01-011983	current
49Alabama-4 !I-459	32.80	52.79	I-20/I-59 in Bessemer, AL	I-59 in Trussville, AL	01984-01-011984	current
59Alabama-7 !I-759	4.50	7.24	I-59 in Attalla, AL	US 411/SR 759 in Gadsden, AL	01986-01-011986	current
64Indiana-1 !I-164	21.39^[8]	34.42	US 41/Veterans Memorial Parkway in Evansville, IN	I-69 in Evansville, IN	01990-01-011990	02014-01-012014	Decommissioned; now part of I-69^[9]
64Kentucky-2 !I-264	22.93	36.90	I-64 in Louisville, KY	I-71 in Louisville, KY	01956-01-011956	current
64Virginia-2 !I-264	25.07	40.35	I-64/I-664 in Chesapeake, VA	Parks Ave in Virginia Beach, VA	01960-01-011960	current
64Virginia-4 !I-464	4.71	7.58	I-64 in Chesapeake, VA	I-264 in Norfolk, VA	01960-01-011960	current
65Virginia-5 !I-564	3.03	4.88	SR 337	I-64 in Norfolk, VA	01970-01-011970	current
64Virginia-6 !I-664	20.21	32.52	I-64/I-264 in Norfolk, VA	I-64 in Hampton, VA	01971-01-011971	current
65Alabama-1 !I-165	4.90	7.89	US 43 in Mobile, AL	I-65 in Mobile, AL	01994-01-011994	current
65Alabama-5 !I-565	21.40	34.44	I-65/US 72/SR 20 in Decatur, AL	US 72 in Huntsville, AL	01991-01-011991	current
65Indiana-1 !I-165	2.70	4.35	I-65/I-70 in Indianapolis, IN	38th Street in Indianapolis, IN	01978-01-011978	01981-01-011981	Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
65Indiana-2 !I-265	6.73	10.83	I-64 in New Albany, IN	SR 62/SR 265 in Clarksville, IN	01977-01-011977	current	Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
65Indiana-4 !I-465	52.79	84.96	Beltway around Indianapolis		01970-01-011970	current
65Indiana-8 !I-865	4.72	7.60	I-65 near Indianapolis, IN	I-465 near Indianapolis	02002-01-012002	current
65Kentucky-2 !I-265	24.48	39.40	I-65/KY 841 in Heritage Creek, KY	I-71/KY 841 in Prospect, KY	01977-01-011977	current	Connected with I-265 in Indiana on December 18, 2016, with the completion of the East End Bridge
65Tennessee-2 !I-265	—	—	I-40 in Nashville, TN	I-65 in Nashville, TN	—	—	Now part of I-65
65Kentucky-5 !I-165	72.18	116.16	US 60/US 231 in Owensboro, KY	I-65 in Bowling Green, KY	proposed	—	Proposed for designation along William H. Natcher Parkway once updated to Interstate standards
66DC-2 !I‑266	1.79	2.88	—	—	—	01972-01-011972	Proposed loop route of I-66 between the District, and Arlington County; if built, would have been the only auxiliary route of I-66; cancelled in the face of community opposition during Washington's freeway revolts
69Kentucky-1 !I-169	34.27	55.15	I-24 near Hopkinsville, KY	I-69 in Nortonville, KY	02017-05-072017	current	New designation along the former Pennyrile Parkway
69Kentucky-3 !I-369	23.441	37.725	I-69/Pennyrile Parkway in Henderson, KY	US 60 in Owensboro, KY	proposed	—	Proposed for designation along Audubon Parkway once upgraded to Interstate standards
69Mississippi-2 !I-269	4.20	6.76	I-55/I-69 in Hernando, MS	I-69 in Millington, TN	02015-01-012015	current	Currently under construction; partially open
69Tennessee-1 !I-169	18.7	30.1	US 45W/US 51 in Union City, TN	US 45E/SR 43 in Martin, TN	proposed	—	Proposed for designation along SR 22 once upgraded to Interstate standards
69Indiana-4 !I-469	30.83	49.62	I-69 in Fort Wayne, IN	I-69 in Fort Wayne, IN	01995-01-011995	current
69Texas-1 !I-169	1.50	2.41	I-69E/US 77/US 83 in Olmito, TX	Port of Brownsville main entrance in Brownsville, TX	02015-01-012015	current	Currently under construction; partially open and co-signed with SH 550
69Texas-3 !I-369	3.50	5.63	Tenaha, TX	Texarkana, TX	02013-01-012013	current	Partially completed in 2013. Eventually, it will surpass I-476 as the longest Auxiliary Interstate in the country.
70Colorado-2 !I-270	5.31	8.55	I-25/US 36 at Welby, CO	I-70/US 36 at Denver, CO	01965-01-011965	current
70Colorado-4 !I-470	—	—	Beltway around Denver Metro, CO		—	—	Now part of SH 470
70Illinois-2 !I-270	50.59	81.42	I-55/Interstate 255	I-55/I-70 near Troy, IL	01956-01-011956	current
70Kansas-4 !I-470	13.72	22.08	I-70 in Topeka, KS	I-70/Kansas Turnpike in Topeka, KS	01960-01-011960	current
70Kansas-6 !I-670	2.81	4.52	I-70 in Kansas City, KS	I-70 in Kansas City, MO	01968-01-011968	current
70MD-1 !I-170	2.30	3.70	I-70 in Baltimore, MD	US 40 in Baltimore, MD	01969-01-011969	01983-01-011983	Cancelled
70MD-2 !I-270	32.60	52.46	I-70 near Frederick, MD	I-495 north of Bethesda, MD	01975-01-011975	current
70MD-2S !I-270 Spur	2.10^[10]	3.38	I-270 east of Potomac, MD	Interstate 495I-495 northwest of Bethesda, MD	01975-01-011975	current	Serves as an alternate connector for Virginia travelers
70MD-3 !I-370	2.54	4.09	I-270 in Gaithersburg, MD	MD 200 in Derwood, MD	01988-01-011988	current
70Missouri-1 !I-170	11.17	17.98	I-64/US 40 in Richmond Heights, MO	I-270 in Hazelwood, MO	01956-01-011956	current
70Missouri-4 !I-470	16.72	26.91	I-49/I-435 in Kansas City, MO	I-70 in Independence, MO	01983-01-011983	current
70Ohio-2 !I-270	54.97	88.47	Beltway around Columbus, OH		01964-01-011964	current
70Ohio-4 !I-470	6.69	10.77	I-70 near Blaine, OH	I-70 in Elm Grove, WV	01976-01-011976	current
70Ohio-6 !I-670	9.37	15.08	I-70 in Columbus, OH	I-270 near John Glenn Columbus International Airport	02003-01-012003	current
71Ohio-2 !I-271	46.06	74.13	I-71 near Medina, OH	I-90 in Willoughby Hills, OH	01964-01-011964	current
71Ohio-4 !I-471	5.75	9.25	I-275 near Newport, KY	I-71 in Cincinnati, OH	01981-01-011981	current
72Illinois-1 !I-172	19.69	31.69	I-72 in Quincy, IL	US 24 in Quincy, IL	01995-01-011995	current
74Illinois-4 !I-474	14.88	23.95	I-74 in Peoria, IL	I-74 in Morton, IL	01973-01-011973	current
74North Carolina-2 !I-274	—	—	—	—	proposed	—	Proposed route in Winston-Salem, NC
75Florida-1 !I-175	1.44	2.32	I-275 in St. Petersburg, FL	SR 687 in St. Petersburg, FL	01980-01-011980	current
75Florida-2 !I-275	60.64	97.59	I-75 near Memphis, FL	I-75 in Wesley Chapel, FL	01973-01-011973	current
75Florida-3 !I-375	1.34	2.16	I-275 in St. Petersburg, FL	US 92 in St. Petersburg, FL	01979-01-011979	current
75-1 !I-175	—	—	US 82 in Albany, GA	I-75 in Cordele, GA	—	—	Now part of SR 300
75Georgia-4 !I-475	15.83	25.48	I-75 in Macon, GA	I-75 in Macon, GA	01965-01-011965	current
75Georgia-5 !I-575	30.97	49.84	I-75 in Kennesaw, GA	SR 5 west of Nelson, GA	01985-01-011985	current
75Georgia-6 !I-675	11.04	17.77	I-75 in Stockbridge, GA	I-285 southeast of Atlanta, GA	01987-01-011987	current
75Indiana-2 !I-275	83.71	134.72	Beltway around Cincinnati, OH		01962-01-011962	current	Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
75Michigan-2 !I-275	35.01^[11]^{[lower-alpha 1]}	56.34	I-75 near Monroe, MI	I-96, I-696 and M-5 in Farmington Hills, MI	01977-01-011977	current
75Michigan-3 !I-375	1.06	1.71	BS I-375 in Detroit, MI	I-75 in Detroit, MI	01964-01-011964	current
75Michigan-4 !I-475	16.99	27.34	I-75 near Grand Blanc, MI	I-75/US 23 near Mount Morris, MI	01973-01-011973	current	Runs east and north of Flint, MI
75Michigan-6 !I-675	7.72	12.42	I-75/US 23 near Saginaw, MI	I-75/US 23 near Zilwaukee, MI	01971-01-011971	current
75Ohio-4 !I-475	20.37	32.78	I-75 in Perrysburg, OH	I-75 in Toledo, OH	01964-01-011964	current
75Ohio-6 !I-675	26.53	42.70	I-75 near Miamisburg, OH	I-70 near Medway, OH	01987-01-011987	current
75-1 !I-175	—	—	I-75 in Chattanooga, TN	I-75 in Lexington, KY	—	—
75Tennessee-2 !I-275	2.98	4.80	I-40 in Knoxville, TN	I-75/I-640 in Knoxville, TN	01982-01-011982	current
75-4 !I-475	—	—	I-40/I-75 near Knoxville, TN	I-75 near Knoxville, TN	—	—	Cancelled
76New Jersey-6 !I-676	6.90	11.10	I-76/US 30 in Philadelphia, PA	I-76 in Camden, NJ	01991-01-011991	current
76Pennsylvania-1 !I-176	11.33	18.23	I-76/Pennsylvania Turnpike in Morgantown, PA	US 422 near Reading, PA	01964-01-011964	current
76Pennsylvania-2 !I-276	32.65	52.55	I-76 in King of Prussia, PA	I-95/I-295 in Bristol Township, PA	01964-01-011964	current
76Pennsylvania-3 !I-376	78.70	126.66	I-80 near Hermitage, PA	I-76/US 22 in Monroeville, PA	01972-01-011972	current
76Pennsylvania-4 !I-476	129.61	208.59	I-95 near Chester, PA	I-81/US 6/US 11 near Clarks Summit, PA	01992-01-011992	current
76Pennsylvania-5 !I-576	—	—	—	—	proposed	—	Proposed Southern Beltway route from Pittsburgh International Airport to I-376
76Pennsylvania-8 !I-876	—	—	—	—	01971-01-011971	01972-01-011972	Short lived renumbering of I-479, now I-579
77North Carolina-2 !I-277	4.46	7.18	Beltway around uptown Charlotte, NC		01981-01-011981	current
77Ohio-2 !I-277	4.14	6.66	I-76 in Akron, OH	I-77 in Akron, OH	01970-01-011970	current
78Pennsylvania-1 !I-178	—	—	—	—	—	01971-01-011971	Cancelled
78Pennsylvania-3 !I-378	—	—	—	—	01968-01-011968	01971-01-011971	Replaced by PA Route 378
78New Jersey-2 !I-278	35.62	57.32	US 1/9 in Linden, NJ	Bruckner Interchange in Bronx, NY	01961-01-011961	current
75New York-4 !I-478	2.14	3.44	I-278 in Brooklyn, NY	NY 9A in Manhattan, NY	01971-01-011971	current	Unsigned
78New York-6 !I-678	14.33	23.06	John F. Kennedy International Airport in Queens, NY	Bruckner Interchange in Bronx, NY	01965-01-011965	current
78New York-8 !I-878	0.70	1.13	I-678 in Queens, NY, near John F. Kennedy International Airport	JFK Expressway in Queens, NY, near JFK Airport	01970-01-011970	current	Unsigned
79Pennsylvania-1 !I-179	—	—	McKean Township, PA	Erie, PA	01958-01-011958	01968-01-011968	Replaced by its parent route, I-79
79Pennsylvania-2 !I-279	13.32	21.44	I-376/US 22/US 30 in Pittsburgh, PA	I-79 in Franklin Park, PA	01972-01-011972	current
79Pennsylvania-4 !I-479	—	—	—	—	01966-01-011966	01971-01-011971	Early number for I-579
79Pennsylvania-5 !I-579	1.57	2.53	PA 885 in Pittsburgh, PA	I-279/PA 28 in Pittsburgh	01962-01-011962	current
80California-1 !I-180	—	—	US 101 in San Rafael, CA	I-80 near Berkeley, CA	01978-01-011978	01991-01-011991	Temporary designation of what was formerly part of SR 17, now part of I-580
80California-2 !I-280	57.22	92.09	I-680/US 101 in San Jose, CA	King Street in San Francisco, CA	01964-01-011964	current
80California-3 !I-380	1.671	2.689	I-280 in San Bruno, CA	US 101 in San Bruno, CA	01964-01-011964	current
80California-4 !I-480	—	—	I-80 in San Francisco, CA	Sansome Street in San Francisco, CA	01957-01-011957	01968-01-011968	Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
80California-5 !I-580	75.63	121.71	US 101 in San Rafael, CA	I-5 near Westley, CA	01964-01-011964	current	Segments were originally part of I-5W
80California-6 !I-680	70.52	113.49	I-280/US 101 in San Jose, CA	I-80 in Cordelia, CA	01955-01-011955	current	Originally SR 21
80California-7 !I-780	6.50	10.46	I-80 in Vallejo, CA	I-680 in Benicia, CA	01955-01-011955	current	Originally part of I-680
80California-8 !I-880	47.22	75.99	I-280/SR 17 in San Jose, CA	I-80/I-580 in Oakland, CA	01983-01-011983	current	Originally part of SR 17
80California-8 !I-880	—	—	I-80 in West Sacramento, CA	I-80 in Sacramento, CA	01971-01-011971	01983-01-011983	Now part of I-80
80California-9 !I-980	2.03	3.27	I-880 in Oakland, CA	I-580/SR 24 in Oakland, CA	01981-01-011981	current
80Nevada-5 !I‑580	30.09	48.43	US 50 in Carson City, NV	I-80 in Reno, NV	02012-01-012012	current	Runs concurrently with US 395
80Illinois-1 !I-180	13.19	21.23	IL 26/IL 71 in Hennepin, IL	I-80 near Princeton, IL	01969-01-011969	current
80Illinois-2 !I-280	26.98	43.42	I-80 near Davenport, IA	I-74/I-80 near Colona, IL	01990-01-011990	current
80Iowa-3 !I-380	73.05	117.56	I-80 near Iowa City, IA	US 218 in Waterloo, IA	01985-01-011985	current	Connects Cedar Rapids, IA, with I-80
80Iowa=4 !I-480	4.90	7.89	I-80/US 75 in Omaha, NE	I-29/US 6 in Council Bluffs, IA	01966-01-011966	current
80Iowa=6 !I-680	42.86	68.98	I-80 in Omaha, NE	I-80 near Neola, IA	01966-01-011966	current
80Nebraska-1 !I-180	3.18	5.12	US 34 in Lincoln, NE	I-80/US 34/US 77 in Lincoln, NE	01965-01-011965	current
80Nebraska 5 !I-280	—	—	—	—	01958-01-011958	01965-01-011965	Now designated as I-680
80Nebraska 5 !I-580	1.60	2.57	I-480 in Omaha, NE	Lake Street in Omaha, NE	01976-01-011976	01982-01-011982	Now part of US 75
80New Jersey-2 !I-280	17.85	28.73	I-80 in Parsippany-Troy Hills, NJ	I-95/New Jersey Turnpike in Kearny, NJ	01958-01-011958	current
80Ohio-2 !I-280	12.41	19.97	I-75 in Toledo, OH	I-80/I-90/Ohio Turnpike in Lake Township, OH	01959-01-011959	current
80Ohio-3 !I-380	—	—	I-76/I-77 in Akron, OH	I-271 in Macedonia, OH	proposed	—
80Ohio-4 !I-480	41.77	67.22	I-80/Ohio Turnpike in North Ridgeville, OH	I-80/Ohio Turnpike in Streetsboro, OH	01971-01-011971	current
80Ohio-6 !I-680	16.43	26.44	I-76/Ohio Turnpike in North Lima, OH	I-80/SR 11 near Mineral Ridge, OH	01964-01-011964	current
80Pennsylvania-1 !I-180	28.85	46.43	US 15/US 220 in Williamsport, PA	I-80/PA 147 near Milton, PA	01984-01-011984	current
80Pennsylvania-1 !I-180	—	—	—	—	—	—	Now part of I-176
80Pennsylvania-2 !I-280	—	—	—	—	01958-01-011958	01964-01-011964	Now part of Pennsylvania Turnpike
80Pennsylvania-3 !I-380	24.76	39.85	I-80 in Tunkhannock Township, PA	I-81/I-84/US 6 in Dunmore, PA	01973-01-011973	current
80Pennsylvania-4 !I-480	—	—	—	—	—	—	Now part of I-476
80Pennsylvania-6 !I-680	—	—	—	—	01958-01-011958	01964-01-011964	Now I-676
80Wyoming-1 !I-180	1.09	1.75	I-80 in Cheyenne, WY	I-80 Bus./US 30 in Cheyenne, WY	01984-01-011984	current	Not built to Interstate Highway standards
81New York-4 !I-481	15.04	24.20	I-81 in Onondaga, NY	I-81/NY 481 in North Syracuse, NY	01970-01-011970	current
81New York-7 !I-781	4.30	6.92	I-81 in Pamelia, NY	Fort Drum main gate in Le Ray, NY	02012-01-012012	current
81Virginia-3 !I-381	1.67	2.69	SR 381 in Bristol, VA	I-81 in Bristol, VA	01961-01-011961	current
81Virginia-5 !I-581	6.64	10.69	US 220/SR 24 in Roanoke, VA	I-81 near Hollins, VA	—	—
82Washington-1 !I-182	15.19	24.45	I-82/US 12 near Richland, WA	US 12/US 395 in Pasco, WA	01986-01-011986	current
83Pennsylvania-2 !I-283	2.91	4.68	I-76/Pennsylvania Turnpike near Highspire, PA	I-83/US 322/Capital Beltway near Harrisburg, PA	01972-01-011972	current
84Connecticut-3 !I-384	8.20	13.20	I-84/US 6 in East Hartford, CT	US 6/US 44 in Bolton, CT	01984-01-011984	current
84Connecticut-6 !I-684	28.47	45.82	I-287 near White Plains, NY	NY 22 near Brewster, NY	01974-01-011974	current	Also crosses into Connecticut
84Idaho-1 !I-184	3.62	5.83	I-84 in Boise, ID	US 20/US 26	01990-01-011990	current
85Alabama-6 !I-685	14.00	22.53	I-65 in downtown Montgomery, AL	I-85 in Montgomery, AL	proposed	—
85Georgia-1 !I-185	49.30	79.34	US 27/US 280/SR 520 in Columbus, GA	I-85 near LaGrange, GA	01979-01-011979	current
85Georgia-2 !I-285	63.98	102.97	Beltway around Atlanta, GA		01969-01-011969	current
85Georgia-4 !I-485	5.9	9.5	I-75/I-85 in Atlanta, GA	I-85 in Atlanta	01964-01-011964	01975-01-011975	Now Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
85Georgia-9 !I-985	24.04	38.69	I-85 near Buford, GA	SR 369 near Gainesville, GA	01985-01-011985	current
85North Carolina-2 !I-285	—	—	I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC	I-40/US 52/US 311/NC 8 in Winston-Salem, NC	proposed	—
85North Carolina-4 !I-485	66.68	107.31	Beltway around Charlotte, NC		01988-01-011988	current
85North Carolina-7 !I-785	2.21	3.56	I-40/I-85/I-840/I-85 Bus. in Greensboro, NC	US 70 in Greensboro, NC	02013-01-012013	current	Future northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
85North Carolina-8 !I-885	—	—	—	—	proposed	—
85South Carolina-1 !I-185	17.70	28.49	I-385 near Mauldin, SC	US 29 in Greenville, SC	01955-01-011955	current
85South Carolina-3 !I-385	42.16	67.85	I-26 near Clinton, SC	US 276 in Greenville, SC	01962-01-011962	current
85South Carolina-5 !I-585	2.25	3.62	US 176/US 221/SC 9 in Spartanburg, SC	I-85 Bus./US 176 near Spartanburg, SC	01962-01-011962	current
87New Jersey-2 !I-287	98.72	158.87	I-95/New Jersey Turnpike in Edison, NJ	I-95 in Rye, NY	01961-01-011961	current
87New York-5 !I-587	1.21	1.95	I-87/New York State Thruway/NY 28 in Kingston, NY	NY 28/NY 32 in Kingston, NY	01960-01-011960	current
87North Carolina-5 !I-587	—	—	Future I-87 (current US 64) near Zebulon, NC	US 264 near Greenville, NC	proposed^[14]	—
87New York-7 !I-787	10.16	16.35	I-87/New York State Thruway in Albany, NY	NY 7 in Green Island, NY	01968-01-011968	current
89-1 !I-189	1.49	2.40	US 7 in South Burlington, VT	I-89 in South Burlington, VT	01980-01-011980	current
90Illinois-1 !I-190	3.07	4.94	O'Hare International Airport in Chicago, IL	I-90 in Chicago, IL	01978-01-011978	current
90Illinois-2 !I-290	29.84	48.02	I-90/IL 53 in Rolling Meadows, IL	I-90/I-94/Congress Parkway in Chicago, IL	01972-01-011972	current
90Illinois-4 !I-490	—	—	I-294	I-90	proposed	—	Proposed route number for the O'Hare West Bypass^[15]
90Massachusetts-1 !I‑190	19.26	31.00	I-290 in Worcester, MA	Route 2 in Leominster, MA	01983-01-011983	current
90Massachusetts-2 !I‑290	20.16	32.44	I-395 in Auburn, MA	I-495 in Marlborough, MA	01970-01-011970	current
90New York-1 !I-190	28.34	45.61	I-90/New York State Thruway in Cheektowaga, NY	Highway 405 at Lewiston, NY	01959-01-011959	current
90New York-2 !I-290	9.80	15.77	I-190 in Tonawanda, NY	I-90/New York State Thruway in Williamsville, NY	01964-01-011964	current
90New York-3 !I-390	76.06	122.41	I-86/NY 17 in Avoca, NY	I-490 in Gates, NY	01973-01-011973	current
90New York-4 !I-490	37.40	60.19	I-90/New York State Thruway in Bergen, NY	I-90/New York State Thruway in Victor, NY	01970-01-011970	current
90New York-5 !I-590	5.31	8.55	I-390 in Brighton, NY	I-490/NY 590 in Rochester, NY	01980-01-011980	current
90New York-6 !I-690	14.19	22.84	I-90/New York State Thruway/NY 690 in Van Buren, NY	I-481 in East Syracuse, NY	01962-01-011962	current
90New York-7 !I-790	2.41	3.88	I-90/New York State Thruway in Deerfield, NY	NY 5A/NY 55 in Utica, NY	01961-01-011961	current
90New York-8 !I-890	9.35	15.05	I-90/New York State Thruway in Rotterdam, NY	I-90/New York State Thruway in Guilderland, NY	01962-01-011962	current
90New York-9 !I-990	6.35	10.22	I-290 in Amherst, NY	NY 263 near Lockport, NY	01985-01-011985	current	Highest numbered Interstate in the Interstate system
90Ohio-4 !I-490	2.43	3.91	I-71/I-90 in Cleveland, OH	East 55th Street in Cleveland, OH	01990-01-011990	current
90South Dakota-1 !I-190	1.72	2.77	I-90 in Rapid City, SD	US 16 in Rapid City, SD	01962-01-011962	current
91Connecticut-2 !I-291	6.02	9.69	I-91 in Windsor, CT	I-84 in Manchester, CT	01994-01-011994	current
91Connecticut-6 !I-691	8.38	13.49	I-84 at the Southington-Cheshire, CT, town line	I-91 in Meriden, CT	01988-01-011988	current
91Massachusetts-2 !I‑291	5.44	8.75	I-91 in Springfield, MA	I-90/Massachusetts Turnpike in Chicopee, MA	01972-01-011972	current
91Massachusetts-3 !I‑391	4.46	7.18	I-91 in Chicopee, MA	High Street in Holyoke, MA	01970-01-011970	current
93-2 !I‑293	11.18	17.99	I-93/NH 101 in Manchester, NH	I-93/Everett Turnpike in Hooksett, NH	02008-01-012008	current
93-3 !I‑393	4.60	7.40	I-93 in Concord, NH	NH 9 in Pembroke, NH	01979-01-011979	current
94Illinois-2 !I-294	53.42	85.97	I-80/I-94 in South Holland, IL	I-94 in Deerfield, IL	01968-01-011968	current
94Michigan-1 !I-194	3.38	5.44	I-94 in Battle Creek, MI	M-66 in Battle Creek, MI	01961-01-011961	current
94Minnesota-3 !I-394	9.75	15.69	I-494/US 12 in Minnetonka, MN	4th Street in Minneapolis, MN	01991-01-011991	current
94Minnesota-4 !I-494	42.94	69.11	I-94/I-694 in Maple Grove, MN	I-94/I-694 in Woodbury, MN	01985-01-011985	current	Western and southern half of the Minneapolis–St. Paul beltway
94Minnesota-6 !I-694	22.62	36.40	I-94/I-494 in Maple Grove, MN	I-94/I-494 in Woodbury, MN	01970-01-011970	current	Northern and eastern half of the Minneapolis–St. Paul beltway
94North Dakota-1 !I-194	1.20	1.93	McKenzie Drive near Bismarck, ND	I-94 near Mandan, ND	—	—	Unsigned
94Wisconsin-7 !I-794	3.75	6.04	I-43/I-94 in Milwaukee, WI	WIS 794 in Milwaukee, WI	01980-01-011980	current
94Wisconsin-8 !I-894	4.70	7.56	I-41/I-94 in Milwaukee, WI	I-41/I-43/I-94 in Milwaukee, WI	01966-01-011966	current	Completely concurrent with I-41
95Connecticut-3 !I-395	54.69	88.02	I-95 in East Lyme, CT	I-290 in Auburn, MA	01983-01-011983	current
95Delaware-2 !I-295	92.30	148.54	I-95/I-495 in New Castle, DE	I-95 in Bristol Township, PA	01994-01-011994	current	Extended into Pennsylvania in 2018
95Delaware-4 !I-495	11.47	18.46	I-95/I-295 in Newport, DE	I-95 in Lower Chichester Township, PA	01977-01-011977	current
95Delaware-8 !I-895	—	—	—	—	01979-01-011979	01980-01-011980	Now part of I-95
95DC-3 !I‑395	13.39	21.55	I-95/I-495 in Springfield, VA	US 50 in Washington, DC	01977-01-011977	current	Original route of I-95 that was proposed to continue through Washington, DC
95District-4 !I‑495	31.41	50.55	Beltway around Washington, DC		01961-01-011961	current	Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
95DC-6 !I‑695	2.00	3.22	I-395 in Washington, DC	I-295 in Washington, DC^[16]	01958-01-011958	current
95Florida-1 !I-195	4.42	7.11	I-95/SR 112 in Miami, FL	SR 905 in Miami Beach, FL	01961-01-011961	current
95Florida=2 !I-295	61.04	98.23	Beltway around Jacksonville, FL		01970-01-011970	current
95Florida-3 !I-395	1.29	2.08	I-95 in Miami, FL	MacArthur Causeway at Watson Island, Miami, FL	01971-01-011971	current
95Florida-5 !I-595	12.86	20.70	I-75/SR 869 in Weston, FL	US 1 in Fort Lauderdale, FL	01990-01-011990	current
95Florida-7 !I-795	—	—	I-95 south of Jacksonville, FL	I-295 in Jacksonville, FL	proposed	—	Currently under construction; partially open as SR 9B but not yet signed as I-795
95Maine-1 !I‑195	1.55	2.49	I-95/Maine Turnpike in Saco, ME	SR 5 in Saco, ME	01980-01-011980	current
95Maine-2 !I‑295	53.11	85.47	I-95/Maine Turnpike in Scarborough, ME	I-95/Maine Turnpike in Gardiner, ME	01960-01-011960	current
95Maine-3 !I‑395	4.99	8.03	I-95/US 2/SR 100 in Bangor, ME	US 1A in Brewer, ME	02008-01-012008	current
95Maine-4 !I‑495	3.70	5.95	I-95/Maine Turnpike in Portland, ME	I-295/US 1 in Falmouth, ME	02004-01-012004	current	Unsigned
95Maryland-1 !I-195	4.71^[17]	7.58	I-95/MD 166 near Catonsville, MD	Baltimore-Washington International Airport	01990-01-011990	current
95Maryland-3 !I-395	1.98	3.19	I-95 in South Baltimore, MD	West Pratt Street in Baltimore, MD	01981-01-011981	current
95Maryland-5 !I-595	19.97	32.14	I-95/I-495/US 50 near Washington, DC	US 50/US 301/MD 70 in Annapolis, MD	02011-01-012011	current	Unsigned designation for US 50
95Maryland-6 !I-695	30.57	49.20	Beltway around Baltimore, MD		01958-01-011958	current
95Maryland-7 !I-795	8.99	14.47	I-695 in Pikesville, MD	MD 140 in Reisterstown, MD	01985-01-011985	current
95Maryland-8 !I-895	11.44	18.41	I-95 near Elkridge, MD	I-95 in Baltimore, MD	01979-01-011979	current
95DC-2 !I‑295	8.05	12.96	I-95/I-495 near Forest Heights, MD	I-695 in Washington, DC	01964-01-011964	current
95Massachusetts-1 !I‑195	44.55	71.70	I-95 in Providence, RI	I-495/Route 25 in Wareham, MA	01958-01-011958	current
95Massachusetts-2 !I‑295	26.58	42.78	I-95 in Warwick, RI	I-95 in Attleboro, MA	01969-01-011969	current
95Massachusetts-4 !I‑495	121.56	195.63	I-195/Route 25 in Wareham, MA	I-95 in Salisbury, MA	01957-01-011957	current
95Massachusetts-6 !I‑695	—	—	I-93 in Roxbury, MA	I-93 in Charlestown, MA	01955-01-011955	01971-01-011971	Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
95Massachusetts-8 !I‑895	—	—	Route 37/I-295 in Cranston, RI	I-95/I-295 in Attleboro, MA	01968-01-011968	01982-01-011982	Cancelled; would have supplemented I-295 to create a full Beltway around Providence, RI
95New Jersey-1 !I-195	34.17	54.99	I-295 in Hamilton Township, NJ	Route 34 in Wall Township, NJ	01968-01-011968	current
95-8 !I-895	—	—	I-295 in Burlington, NJ	I-95 in Bristol, PA	01963-01-011963	01981-01-011981	Never built
95New York-2 !I-295	7.70	12.39	NY 25/NY 24 in Queens, NY	Bruckner Interchange in Bronx, NY	01970-01-011970	current
95New York-4 !I-495	66.38	106.83	Queens Midtown Tunnel in Manhattan, NY	CR 58 in Riverhead, NY	01958-01-011958	current
95New York-6 !I-695	1.40	2.25	I-95 in Bronx, NY	I-295 in Bronx, NY	01986-01-011986	current
95New York-8 !I-895	1.12	1.80	I-278 in Bronx, NY	I-95 in Bronx, NY	01970-01-011970	02017-01-012017^[18]	Currently designated as NY 895
95North Carolina-2 !I-295	—	—	—	—	proposed	—	Planned route around the west side of Fayetteville, NC
95North Carolina-4 !I-495	4.10	6.60	I-440/US 64/US 64 Bus. in Raleigh, NC	I-540/US 64/US 264 in Knightdale, NC	02013-01-012013	02017-01-012017	Now part of I-87
95North Carolina-7 !I-795	25.46	40.97	US 70/US 117 in Goldsboro, NC	I-95/US 264 in Wilson, NC	02007-01-012007	current
95Pennsylvania-6 !I-695	—	—	I-95 near Philadelphia International Airport	I-95 in Philadelphia, PA	01964-01-011964	01977-01-011977	Never built
95Virginia-1 !I-195	3.24	5.21	SR 195 in Richmond, VA	I-64/I-95 in Richmond, VA	01970-01-011970	current
95Virginia-2 !I-295	52.56	84.59	I-95 near Petersburg, VA	I-64 near Short Pump, VA	01980-01-011980	current
95Virginia-5 !I-595	—	—	I-395 near Arlington, VA	US 1 at Ronald Reagan Washington National Airport	—	—	Now part of US 1
95Virginia-8 !I-895	—	—	I-95 near Richmond, VA	I-295 near Richmond, VA	01996-01-011996	02002-01-012002	Currently designated as SR 895, it was originally planned as a Interstate designation, but did not get approved by AASHTO
95Pennsylvania-4 !I-495	—	—	—	—	01956-01-011956	01958-01-011958	Early number of I-476
96-1-1 !I-196	37.07^[11]	59.66	US 31 in Norton Shores, MI	I-96/US 16 in Grand Rapids, MI	01959-01-011959	01963-01-011963	Now the western end of I-96
96-1-2 !I-196	80.65	129.79	I-94/US 31 near Benton Harbor, MI	I-96/M-37 in Grand Rapids, MI	01963-01-011963	current
96-2 !I-296	3.43	5.52	I-196 in Grand Rapids, MI	I-96/M-37 in Walker, MI	01962-01-011962	current	Unsigned since 1979
96-4 !I-496	11.78	18.96	I-69/I-96 near Lansing, MI	I-96 and US 127 near Lansing, MI	01970-01-011970	current
96-6 !I-696	29.39	47.30	I-96/I-275 & M-5 in Novi, MI	I-94 in Roseville, MI	01989-01-011989	current
97Maryland-1 !I-197	3.44	5.54	—	—	—	—	Replaced by I-595.
97Maryland-2 !I-297	—	—	—	—	—	01987-01-011987	Withdrawn from request, replaced by MD Route 3.
Former Future

Notes

↑ According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.^[3] MDOT and most major map publishers do count the overlap.^[11]^[12]^[13]

References

↑ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
1 2 3 DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.
1 2 Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.
↑ Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017.
↑ Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.
↑ Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
↑ Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.
↑ Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.
↑ Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF) (Letter). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.
↑
Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
- Montgomery County (PDF)
1 2 3 Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved February 6, 2016.
↑ Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.
↑ Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.
↑ "State Seeking Future Interstate Designation for US 264 to Greenville". North Carolina Governor's Office (Press release). Retrieved November 10, 2016.
↑ Borggren, Erica J. (6 October 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on 3 March 2016.
↑ DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.
↑
Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
- Anne Arundel County (PDF) pp. 6–7
- Baltimore County (PDF) pp. 18–20, 162
↑ Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Retrieved October 21, 2017.

External links

3-digit Interstates at Kurumi.com

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[14] According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.^[3] MDOT and most major map publishers do count the overlap.^[11]^[12]^[13]

[FAHA56-1] Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.

[fhwamain-2] 1 2 3 DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.

[fhwa-3] 1 2 Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.

[AASHTO90A-4] Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017.

[calnexus905-5] Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.

[cavanaugh-6] Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.

[840hold-7] Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.

[fhwa2002-8] Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.

[9] Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF) (Letter). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.

[MarylandHLR-10] Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
Montgomery County (PDF)

[mw_A] Montgomery County (PDF)

[PRFA-11] 1 2 3 Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved February 6, 2016.

[RM-12] Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.

[google-13] Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.

[15] "State Seeking Future Interstate Designation for US 264 to Greenville". North Carolina Governor's Office (Press release). Retrieved November 10, 2016.

[16] Borggren, Erica J. (6 October 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on 3 March 2016.

[17] DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.

[Maryland_HLR195-18] Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
Anne Arundel County (PDF) pp. 6–7

Baltimore County (PDF) pp. 18–20, 162

[mwAUI] Anne Arundel County (PDF) pp. 6–7

[mwAUU] Baltimore County (PDF) pp. 18–20, 162

[19] Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Retrieved October 21, 2017.

Primary Interstate Highways
Signed	2 4 5 8 10 11 12 14 15 16 17 19 20 22 24 25 26 27 29 30 35 37 39 40 41 43 44 45 49 55 57 59 64 65 66 68 69 70 71 72 73 74 75 76 CO–NE OH–NJ 77 78 79 80 81 82 83 84 OR–UT PA–MA 85 86 ID PA–NY 87 NC NY 88 IL NY 89 90 91 93 94 95 96 97 99 H-1 H-2 H-3
Unsigned	A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists	Primary Auxiliary Suffixed Business Future
Other	Standards Temporary Bypassed Gaps Tolled
Major Interstates highlighted

List of auxiliary Interstate Highways

Terminology and guidelines

Spur route

Bypass

Beltway

Auxiliary Interstates

See also

Notes

References

External links