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.

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Table State,federal district,or territory Largest county,parish,or municipality Population(2024 estimate) County seat,parish seat,or shire town State,federal district,or territory population(2024 estimate) Population of largest county, parish, or municipality as a percentage of total state, federal district, or territory population Jefferson 664,744 Birmingham 5,157,699 12.89% Anchorage 289,600 Anchorage 740,133 39.13% Western District 31,819 — 46,765 68.04% Maricopa 4,673,096 Phoenix 7,582,384 61.63% Pulaski 401,209 Little Rock 3,088,354 12.99% Los Angeles 9,757,179 Los Angeles 39,431,263 24.74% El Paso 752,772 Colorado Springs 5,957,493 12.64% Capitol 991,508 Hartford 3,675,069 26.98% New Castle 588,093 Wilmington 1,051,917 55.91% District of Columbia 702,250 District of Columbia 702,250 100.00% Miami-Dade 2,838,461 Miami 23,372,215 12.14% Georgia Fulton 1,090,354 Atlanta 11,180,878 9.75% Guam 168,801 Hagåtña 168,801 100.00% Honolulu 998,747 Honolulu 1,446,146 69.06% Ada 535,799 Boise 2,001,619 26.77% Cook 5,182,617 Chicago 12,710,158 40.78% Marion 981,628 Indianapolis 6,924,275 14.18% Polk 516,185 Des Moines 3,241,488 15.92% Johnson 632,276 Olathe 2,970,606 21.28% Jefferson 793,881 Louisville 4,588,372 17.30% East Baton Rouge 453,022 Baton Rouge 4,597,740 9.85% Cumberland 313,809 Portland 1,405,012 22.33% Montgomery 1,082,273 Rockville 6,263,220 17.28% Middlesex 1,668,956 Cambridge and Lowell 7,136,171 23.39% Wayne 1,771,063 Detroit 10,140,459 17.47% Hennepin 1,273,334 Minneapolis 5,793,151 21.98% Harrison 213,730 Biloxi and Gulfport 2,943,045 7.26% St. Louis 992,929 Clayton 6,245,466 15.90% Yellowstone 171,583 Billings 1,137,233 15.09% Douglas 601,158 Omaha 2,005,465 29.98% Clark 2,398,871 Las Vegas 3,267,467 73.42% Hillsborough 430,462 Manchester and Nashua 1,409,032 30.55% Bergen 978,641 Hackensack 9,500,851 10.30% Bernalillo 671,747 Albuquerque 2,130,256 31.53% New York Kings 2,617,631 Brooklyn 19,867,248 13.18% Wake 1,232,444 Raleigh 11,046,024 11.16% Cass 200,945 Fargo 796,568 25.23% Saipan 43,385 Capitol Hill 44,278 97.98% Franklin 1,356,303 Columbus 11,883,304 11.41% Oklahoma 816,490 Oklahoma City 4,095,393 19.94% Multnomah 795,897 Portland 4,272,371 18.63% Philadelphia 1,573,916 Philadelphia 13,078,751 12.03% San Juan 332,454 San Juan 3,203,295 10.38% Providence 675,912 Providence 1,112,308 60.77% Greenville 570,745 Greenville 5,478,831 10.42% Minnehaha 208,639 Sioux Falls 924,669 22.56% Shelby 910,530 Memphis 7,227,750 12.60% Harris 5,009,302 Houston 31,290,831 16.01% U.S. Minor Outlying Islands Wake Island (150) (none) (300) 50.00% Salt Lake 1,216,274 Salt Lake City 3,503,613 34.71% Chittenden 170,851 Burlington 648,493 26.35% Virgin Islands (U.S.) Saint Thomas island 44,500 — 104,377 42.63% Fairfax 1,160,925 Fairfax 8,811,195 13.18% Washington King 2,340,211 Seattle 7,958,180 29.41% Kanawha 173,906 Charleston 1,769,979 9.83% Milwaukee 924,740 Milwaukee 5,960,975 15.51% Laramie 101,783 Cheyenne 587,618 17.32%

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