List of the most populous counties by U.S. state
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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 (2024 estimate)[3] |
County seat, parish seat, or shire town |
State, federal district, or territory population (2024 estimate)[4][note 2] |
Population of largest county, parish, or municipality as a percentage of total state, federal district, or territory population |
|---|---|---|---|---|---|
 Alabama | Jefferson | 664,744 | Birmingham | 5,157,699 | 12.89% |
 Alaska | Anchorage | 289,600 | Anchorage | 740,133 | 39.13% |
 American Samoa | Western District[1][note 3] | 31,819[5] | — | 46,765 | 68.04% |
 Arizona | Maricopa | 4,673,096 | Phoenix | 7,582,384 | 61.63% |
 Arkansas | Pulaski | 401,209 | Little Rock | 3,088,354 | 12.99% |
 California | Los Angeles | 9,757,179 | Los Angeles | 39,431,263 | 24.74% |
 Colorado | El Paso | 752,772 | Colorado Springs | 5,957,493 | 12.64% |
 Connecticut | Capitol | 991,508 | Hartford | 3,675,069 | 26.98% |
 Delaware | New Castle | 588,093 | Wilmington | 1,051,917 | 55.91% |
 District of Columbia | District of Columbia | 702,250 | District of Columbia | 702,250 | 100.00% |
 Florida | Miami-Dade | 2,838,461 | Miami | 23,372,215 | 12.14% |
 Georgia | Fulton | 1,090,354 | Atlanta | 11,180,878 | 9.75% |
 Guam | Guam[note 4] | 943 | Hagåtña | 167,777 | 0.56% |
 Hawaii | Honolulu | 998,747 | Honolulu | 1,446,146 | 69.06% |
 Idaho | Ada | 535,799 | Boise | 2,001,619 | 26.77% |
 Illinois | Cook | 5,182,617 | Chicago | 12,710,158 | 40.78% |
 Indiana | Marion | 981,628 | Indianapolis | 6,924,275 | 14.18% |
 Iowa | Polk | 516,185 | Des Moines | 3,241,488 | 15.92% |
 Kansas | Johnson | 632,276 | Olathe | 2,970,606 | 21.28% |
 Kentucky | Jefferson | 793,881 | Louisville | 4,588,372 | 17.30% |
 Louisiana | East Baton Rouge | 453,022 | Baton Rouge | 4,597,740 | 9.85% |
 Maine | Cumberland | 313,809 | Portland | 1,405,012 | 22.33% |
 Maryland | Montgomery | 1,082,273 | Rockville | 6,263,220 | 17.28% |
 Massachusetts | Middlesex | 1,668,956 | Cambridge and Lowell | 7,136,171 | 23.39% |
 Michigan | Wayne | 1,771,063 | Detroit | 10,140,459 | 17.47% |
 Minnesota | Hennepin | 1,273,334 | Minneapolis | 5,793,151 | 21.98% |
 Mississippi | Harrison | 213,730 | Biloxi and Gulfport | 2,943,045 | 7.26% |
 Missouri | St. Louis | 992,929 | Clayton | 6,245,466 | 15.90% |
 Montana | Yellowstone | 171,583 | Billings | 1,137,233 | 15.09% |
 Nebraska | Douglas | 601,158 | Omaha | 2,005,465 | 29.98% |
 Nevada | Clark | 2,398,871 | Las Vegas | 3,267,467 | 73.42% |
 New Hampshire | Hillsborough | 430,462 | Manchester and Nashua | 1,409,032 | 30.55% |
 New Jersey | Bergen | 978,641 | Hackensack | 9,500,851 | 10.30% |
 New Mexico | Bernalillo | 671,747 | Albuquerque | 2,130,256 | 31.53% |
 New York | Kings | 2,617,631 | Brooklyn | 19,867,248 | 13.18% |
 North Carolina | Wake[6] | 1,232,444 | Raleigh | 11,046,024 | 11.16% |
 North Dakota | Cass | 200,945 | Fargo | 796,568 | 25.23% |
 Northern Mariana Islands | Saipan[1] | 43,385 | Capitol Hill | 44,278 | 97.98% |
 Ohio | Franklin[7] | 1,356,303 | Columbus | 11,883,304 | 11.41% |
 Oklahoma | Oklahoma | 816,490 | Oklahoma City | 4,095,393 | 19.94% |
 Oregon | Multnomah | 795,897 | Portland | 4,272,371 | 18.63% |
 Pennsylvania | Philadelphia | 1,573,916 | Philadelphia | 13,078,751 | 12.03% |
 Puerto Rico | San Juan[1] | 332,454 | San Juan | 3,203,295 | 10.38% |
 Rhode Island | Providence | 675,912 | Providence | 1,112,308 | 60.77% |
 South Carolina | Greenville | 570,745 | Greenville | 5,478,831 | 10.42% |
 South Dakota | Minnehaha | 208,639 | Sioux Falls | 924,669 | 22.56% |
 Tennessee | Shelby | 910,530 | Memphis | 7,227,750 | 12.60% |
 Texas | Harris | 5,009,302 | Houston | 31,290,831 | 16.01% |
 U.S. Minor Outlying Islands | Wake Island | (150)[note 5] | (none) | (300) | 50.00% |
 Utah | Salt Lake | 1,216,274 | Salt Lake City | 3,503,613 | 34.71% |
 Vermont | Chittenden | 170,851 | Burlington | 648,493 | 26.35% |
 Virgin Islands (U.S.) | Saint Thomas island[1] | 44,500 | —[note 6] | 104,377 | 42.63% |
 Virginia | Fairfax | 1,160,925 | Fairfax | 8,811,195 | 13.18% |
 Washington | King | 2,340,211 | Seattle | 7,958,180 | 29.41% |
 West Virginia | Kanawha | 173,906 | Charleston | 1,769,979 | 9.83% |
 Wisconsin | Milwaukee | 924,740 | Milwaukee | 5,960,975 | 15.51% |
 Wyoming | Laramie | 101,783 | Cheyenne | 587,618 | 17.32% |
Notes
- 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]
- Territory estimates are from 2017 (except American Samoa — its estimate is from 2010).
- 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]
- 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.
- "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.
