List of Interstate Highways in Maryland

The following is a list of Interstate Highways in Maryland. There are currently 16 Interstate Highways that exist entirely or partially in the U.S. state of Maryland. Six of these are primary interstates while ten are auxiliary interstates related to one of the primary interstates. The longest primary interstate in Maryland is Interstate 95 (commonly abbreviated I-95) at 110.01 mi (177.04 km). The shortest primary interstate in Maryland is I-81 at 12.08 mi (19.44 km). I-97 is the shortest primary interstate at 17.62 mi (28.36 km) and the shortest intrastate interstate. I-97 is also the only primary interstate to be located entirely within one county and to not connect with any other primary interstate. The longest auxiliary interatate in Maryland is I-695 at 51.48 mi (82.85 km). The shortest auxiliary interstate in Maryland is I-295 at 0.80 mi (1.29 km). All interstates are maintained by the Maryland State Highway Administration except for all of I-395, all of I-895, a small part of I-695, I-95 within and north of Baltimore, and I-83 within Baltimore. Maryland has one unsigned interstate, I-595; that highway is marked as U.S. Route 50 and US 301, which are concurrent with I-595 for its entire length. Maryland has three former interstates which are shaded in dark gray in the list.

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-68 81.09130.50 I-68 at the West Virginia state line near FriendsvilleI-70 / US 40 / US 522 in Hancock 01991-01-011991[2]current Formerly designated as US 48.
I-70 93.62150.67 I-70 / US 522 at the Pennsylvania state line in HancockMD 122 / Park and ride in Baltimore 01962-01-011962[3]current Frederick–Baltimore section was designated I-70N in 1965;[4] that section became part of I-70 in 1974[5]
I-70N 93.62150.67 I-70 in FrederickMD 122 / Park and ride in Baltimore 01965-01-011965[3]01974-01-011974 Frederick–Baltimore section was designated I-70N in 1965;[4] that section became part of I-70 in 1974[5]
I-70S 32.6052.46 I-495 / MD 355 in BethesdaI-70 / US 40 in Frederick 01959-01-011959[6]01974-01-011974 Designated I-70S in 1959; became I-270 in 1974[5]
I-81 12.0819.44 I-81 at the West Virginia state line in WilliamsportI-81 at the Pennsylvania state line near Hagerstown 01959-01-011959[6]current
I-83 34.5055.52 Fayette Street and President Street in BaltimoreI-83 at the Pennsylvania state line at Maryland Line 01959-01-011959[6]current
I-95 109.01175.43 I-95 / I-495 at the Virginia state line near Oxon HillI-95 at the Delaware state line near Elkton 01963-01-011963[7]current
I-97 17.6228.36 US 50 / US 301 in ParoleI-695 / I-895 in Ferndale 01987-01-011987[8]current
I-170 1.402.25 US 1 / US 40 in BaltimoreUS 40 in Baltimore 01981-01-011981[9]01985-01-011985[10] Replaced by US 40
I-195 4.357.00 I-95 / MD 166 in ArbutusMD 170 near BWI Airport 01989-01-011989[11]current
I-270 32.6052.46 I-495 / MD 355 in BethesdaI-70 / US 40 in Frederick 01974-01-011974[6]current Designated I-70S in 1959; became I-270 in 1974[5]
I-295 0.801.29 I-95 / I-495 / MD 210 in Oxon HillI-295 in Washington, D.C. 01965-01-011965[4]current
I-370 2.544.09 Sam Eig Highway in GaithersburgMD 200 in Redland 01989-01-011989[11]current
I-395 1.332.14 I-95 in BaltimoreHoward Street and Camden Street in Baltimore 01981-01-011981[9]current
I-495 41.0966.13 I-95 / I-495 at the Virginia state line near Oxon HillI-495 at the Virginia state line near Cabin John 01963-01-011963[7]current Beltway around Washington, D.C.
I-595 19.9732.14 I-95 / I-495 / US 50 near GlenardenUS 50 / US 301 / MD 70 in Parole 01991-01-011991current Unsigned highway; signed as US 50 and US 301
I-695 51.4682.82 Beltway around Baltimore 01959-01-011959[6]current
I-795 8.9914.47 I-695 in PikesvilleMD 140 / MD 795 in Reisterstown 01985-01-011985[10]current
I-895 14.8723.93 I-95 in ElkridgeI-95 in Baltimore 01979-01-011979[12]current
  •       Former
Interstate Highways of the Maryland highway system
Standard route signs in Maryland
Highway names
InterstatesInterstate X (I-X)
System links

See also
  • Maryland roads portal

References
  1. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved 2012-10-06.
  2. Maryland State Highway Administration (1991). Maryland: Official Highway Map (Map). Baltimore: Maryland State Highway Administration.
  3. Maryland State Roads Commission (1962). Maryland: Official Highway Map (Map). Baltimore: Maryland State Roads Commission.
  4. Maryland State Roads Commission (1965). Maryland: Official Highway Map (Map). Baltimore: Maryland State Roads Commission.
  5. Maryland State Highway Administration (1974). Maryland: Official Highway Map (Map). Baltimore: Maryland State Highway Administration.
  6. Maryland State Roads Commission (1959). Maryland: Official Highway Map (Map). Baltimore: Maryland State Roads Commission.
  7. Maryland State Roads Commission (1963). Maryland: Official Highway Map (Map). Baltimore: Maryland State Roads Commission.
  8. Maryland State Highway Administration (1987). Maryland: Official Highway Map (Map). Baltimore: Maryland State Highway Administration.
  9. Maryland State Highway Administration (1981). Maryland: Official Highway Map (Map) (1981–1982 ed.). Baltimore: Maryland State Highway Administration.
  10. Maryland State Highway Administration (1985). Maryland: Official Highway Map (Map) (1985–1986 ed.). Baltimore: Maryland State Highway Administration.
  11. Maryland State Highway Administration (1989). Maryland: Official Highway Map (Map). Baltimore: Maryland State Highway Administration.
  12. Maryland State Highway Administration (1979). Maryland: Official Highway Map (Map) (1979–1980 ed.). Baltimore: Maryland State Highway Administration.
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