List of the most populous counties by U.S. state

The following is a sortable table of the most populous county in each U.S. state, federal district, and territory. Counties and states/territories in bold have a population of at least 1 million.

Table
State
federal district
or territory		 Largest county
parish
or municipality[note 1]		 Population
(2013 estimate)		 County
parish seat
or shire town		 State
federal district
or territory population
(2013 estimate)[3][note 2]		 Largest county/parish or municipality
Percentage of
state/federal district or territory population
 AlabamaJefferson659,479Birmingham4,833,72213.64%
 AlaskaAnchorage300,950Anchorage735,13240.94%
 American SamoaWestern District[1][note 3]31,329[4]—55,51956.42%
 ArizonaMaricopa4,009,412Phoenix6,626,62460.50%
 ArkansasPulaski391,284Little Rock2,959,37313.22%
 CaliforniaLos Angeles10,017,068Los Angeles38,332,52126.13%
 ColoradoEl Paso655,044Colorado Springs5,268,36712.43%
 ConnecticutFairfield939,904Bridgeport3,596,08026.14%
 DelawareNew Castle549,684Wilmington925,74959.38%
 District of ColumbiaDistrict of Columbia693,972District of Columbia693,972100%
 FloridaMiami-Dade2,617,176Miami19,552,86013.39%
GeorgiaFulton1,010,562Atlanta10,214,86009.85%
 GuamGuam[note 4]162,742Hagåtña162,742100%
 HawaiiHonolulu983,429Honolulu1,404,05470.04%
 IdahoAda416,464Boise1,612,13625.83%
 IllinoisCook5,240,700Chicago12,882,13540.68%
 IndianaMarion928,281Indianapolis6,570,90214.13%
 IowaPolk451,677Des Moines3,090,41614.62%
 KansasJohnson566,933Olathe2,893,95719.59%
 KentuckyJefferson756,832Louisville4,395,29517.22%
 LouisianaEast Baton Rouge445,227Baton Rouge4,625,47009.63%
 MaineCumberland285,456Portland1,328,30221.49%
 MarylandMontgomery1,016,677Rockville5,928,81417.15%
 MassachusettsMiddlesex1,552,802Cambridge and Lowell6,692,82423.20%
 MichiganWayne1,775,273Detroit9,895,62217.94%
 MinnesotaHennepin1,198,778Minneapolis5,420,38022.12%
 MississippiHinds244,899Jackson2,991,20708.19%
 MissouriSt. Louis1,001,444Clayton6,044,17116.57%
 MontanaYellowstone154,162Billings1,015,16515.19%
 NebraskaDouglas531,265Omaha1,868,51628.43%
 NevadaClark2,027,868Las Vegas2,790,13672.68%
 New HampshireHillsborough402,922Manchester and Nashua1,323,45930.44%
 New JerseyBergen925,328Hackensack8,899,33910.40%
 New MexicoBernalillo673,460Albuquerque2,085,28732.30%
New YorkKings2,592,149Brooklyn19,651,12713.19%
 North CarolinaMecklenburg990,977Charlotte9,848,06010.06%
 North DakotaCass162,829Fargo723,39322.51%
 Northern Mariana IslandsSaipan[1]48,220Capitol Hill, Saipan52,26392.26%
 OhioCuyahoga[5]1,268,154Cleveland11,570,80810.96%
 OklahomaOklahoma755,245Oklahoma City3,850,56819.61%
 OregonMultnomah759,256Portland3,930,06519.32%
 PennsylvaniaPhiladelphia1,553,165Philadelphia12,773,80112.16%
 Puerto RicoSan Juan[1]395,326San Juan3,337,17711.84%
 Rhode IslandProvidence628,323Providence1,051,51159.75%
 South CarolinaGreenville474,266Greenville4,774,83909.93%
 South DakotaMinnehaha179,640Sioux Falls844,87721.26%
 TennesseeShelby940,764Memphis6,495,97814.48%
 TexasHarris4,336,853Houston26,448,19316.40%
U.S. Minor Outlying IslandsWake Island(100)[note 5](none)(160)62.5%
 UtahSalt Lake1,063,842Salt Lake City2,900,87236.67%
 VermontChittenden158,504Burlington626,63025.29%
Virgin Islands (U.S.)Saint Thomas island[1]51,634—[note 6]104,90149.22%
 VirginiaFairfax1,116,897Fairfax8,260,40513.52%
WashingtonKing2,044,449Seattle6,971,40629.33%
 West VirginiaKanawha191,275Charleston1,854,30410.32%
 WisconsinMilwaukee956,023Milwaukee5,742,71316.65%
 WyomingLaramie95,809Cheyenne582,65816.44%

Notes
  1. In the U.S. territories, the U.S. Census Bureau defines the following as county-equivalents: the districts and atolls of American Samoa, Guam as one entity, the municipalities of the Northern Mariana Islands, the municipalities of Puerto Rico, the islands of the U.S. Virgin Islands, and the islands of the U.S. Minor Outlying Islands.[1][2] The District of Columbia is counted as one county-equivalent by the U.S. Census Bureau.[1]
  2. Territory estimates are from 2017 (except American Samoa — its estimate is from 2010).
  3. American Samoa has 14 counties, but these counties are not counted by the U.S. Census Bureau (they are treated as minor civil divisions).[2]
  4. All of Guam is counted as one county-equivalent by the U.S. Census Bureau.[1]
  5. Wake Island's population is non-permanent. Wake Island, Midway Atoll and Palmyra Atoll all have small non-permanent human populations; of these, Wake Island is the most populous. The U.S. Census Bureau counts the islands in the U.S. Minor Outlying Islands as a county-equivalents.
  6. "Saint Thomas island" is a U.S. Census Bureau entity (county-equivalent) with no administrative significance.[1] Charlotte Amalie is the largest city on Saint Thomas and is the capital of the U.S. Virgin Islands.

References
  1. https://www.census.gov/geo/reference/codes/cou.html 2010 FIPS Codes for Counties and County Equivalent Entities. Census.gov. Retrieved September 23, 2018.
  2. https://www2.census.gov/geo/pdfs/reference/GARM/Ch4GARM.pdf
    States, Counties, and Statistically Equivalent Entities (Chapter 4). Census.gov. Retrieved September 23, 2018.
  3. https://www.census.gov/popest/data/historical/2010s/vintage_2013/state.html
  4. https://media1.britannica.com/eb-media/30/77730-004-369421B0.pdf American Samoa (World Data). Britannica.com. Retrieved September 23, 2018.
  5. Unofficially, according to more recent information, Franklin County is now the most populous county in Ohio. http://www.cleveland.com/datacentral/index.ssf/2016/04/franklin_county_overtakes_cuya.html
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