# List of the most populous counties in the United States

This is a list of the 100 most populous of the 3,144 counties in the United States based on the national decennial US census conducted on April 1, 2020, and vintage Census population estimates for July 1, 2024.
Many of the counties on the list include major cities or metropolitan areas in all parts of the United States. Six of the listed counties have consolidated city and county government, namely the City and County of Honolulu, Metropolitan Government of Nashville and Davidson County, Tennessee, City and County of Philadelphia, City and County of San Francisco, City of Jacksonville and Duval County, Indianapolis and Marion County, and City and County of Denver. Kings County, Queens County, New York County, Bronx County, and Richmond County are coterminous with the respective boroughs of New York City; they fall under the jurisdiction of the combined Government of New York City. Independent cities are not counted.
Many of the most populous counties listed are in Southern California, Texas, and New York, and roughly correspond to several of the most populous cities or municipalities in the United States. Counties in the Western United States are typically larger by area and therefore often have higher absolute populations even with comparable population densities.

## List

This list includes the most populous US counties and the District of Columbia sorted according to both the 2020 official enumeration and 2024 vintage population estimates by the United States Census Bureau (USCB).
| Rank | County | State | Land area | Land area | April 1, 2020 census | July 1, 2024 estimates | Mid-2020 to mid-2024 change | Mid-2020 to mid-2024 change | County seat |
| Rank | County | State | km$^2$ | mi$^2$ | April 1, 2020 census | July 1, 2024 estimates | absolute | % | County seat |
| 1 | Los Angeles | California | 10,509.87 | 4,057.88 | 10,014,009 | 9,757,179 | -256,830 | -2.6 | Los Angeles |
| 2 | Cook | Illinois | 2,448.38 | 945.33 | 5,275,541 | 5,182,617 | -92,924 | -1.8 | Chicago |
| 3 | Harris | Texas | 4,411.99 | 1,703.48 | 4,731,145 | 5,009,302 | 278,157 | 5.9 | Houston |
| 4 | Maricopa | Arizona | 23,828.26 | 9,200.14 | 4,420,568 | 4,673,096 | 252,528 | 5.7 | Phoenix |
| 5 | San Diego | California | 10,895.12 | 4,206.63 | 3,298,634 | 3,298,799 | 165 | 0.0 | San Diego |
| 6 | Orange | California | 2,047.56 | 790.57 | 3,186,989 | 3,170,435 | -16,554 | -0.5 | Santa Ana |
| 7 | Miami-Dade | Florida | 4,915.06 | 1,897.72 | 2,701,767 | 2,838,461 | 136,694 | 5.1 | Miami |
| 8 | Dallas | Texas | 2,256.60 | 871.28 | 2,613,539 | 2,656,028 | 42,489 | 1.6 | Dallas |
| 9 | Kings | New York | 183.41 | 70.82 | 2,736,074 | 2,617,631 | -118,443 | -4.3 | Brooklyn, NYC |
| 10 | Riverside | California | 18,664.70 | 7,206.48 | 2,418,185 | 2,529,933 | 111,748 | 4.6 | Riverside |
| 11 | Clark | Nevada | 20,438.71 | 7,891.43 | 2,265,461 | 2,398,871 | 133,410 | 5.9 | Las Vegas |
| 12 | King | Washington | 5,479.29 | 2,115.57 | 2,269,675 | 2,340,211 | 70,536 | 3.1 | Seattle |
| 13 | Queens | New York | 281.10 | 108.53 | 2,405,464 | 2,316,841 | -88,623 | -3.7 | Queens, NYC |
| 14 | Tarrant | Texas | 2,236.74 | 863.61 | 2,110,640 | 2,230,708 | 120,068 | 5.7 | Fort Worth |
| 15 | San Bernardino | California | 51,947.23 | 20,056.94 | 2,181,654 | 2,214,281 | 32,627 | 1.5 | San Bernardino |
| 16 | Bexar | Texas | 3,211.12 | 1,239.82 | 2,009,324 | 2,127,737 | 118,413 | 5.9 | San Antonio |
| 17 | Broward | Florida | 3,133.33 | 1,209.79 | 1,944,375 | 2,037,472 | 93,097 | 4.8 | Fort Lauderdale |
| 18 | Santa Clara | California | 3,341.34 | 1,290.10 | 1,936,259 | 1,926,325 | -36,049 | -1.9 | San Jose |
| 19 | Wayne | Michigan | 1,585.28 | 612.08 | 1,793,561 | 1,771,063 | -22,498 | -1.3 | Detroit |
| 20 | Middlesex | Massachusetts | 2,118.14 | 817.82 | 1,632,002 | 1,668,956 | 36,954 | 2.3 | Lowell and Cambridge |
| 21 | New York | New York | 59.13 | 22.83 | 1,694,251 | 1,660,664 | -33,587 | -2.0 | Manhattan, NYC |
| 22 | Alameda | California | 1,914.05 | 739.02 | 1,682,353 | 1,649,060 | -33,293 | -2.0 | Oakland |
| 23 | Sacramento | California | 2,498.42 | 964.64 | 1,584,169 | 1,611,231 | 27,062 | 1.7 | Sacramento |
| 24 | Palm Beach | Florida | 5,100.00 | 1,970.00 | 1,492,191 | 1,582,055 | 89,864 | 6.0 | West Palm Beach |
| 25 | Hillsborough | Florida | 2,642.34 | 1,020.21 | 1,459,762 | 1,581,426 | 121,664 | 8.3 | Tampa |
| 26 | Philadelphia | Pennsylvania | 347.32 | 134.10 | 1,603,797 | 1,573,916 | -29,881 | -1.9 | Philadelphia |
| 27 | Suffolk | New York | 2,362.20 | 912.05 | 1,525,920 | 1,535,909 | 9,989 | 0.7 | Riverhead |
| 28 | Orange | Florida | 2,339.87 | 903.43 | 1,429,908 | 1,533,646 | 103,738 | 7.3 | Orlando |
| 29 | Nassau | New York | 737.41 | 284.72 | 1,395,774 | 1,392,438 | -3,336 | -0.2 | Mineola |
| 30 | Bronx | New York | 109.03 | 42.10 | 1,472,654 | 1,384,724 | -87,930 | -6.0 | Bronx, NYC |
| 31 | Travis | Texas | 2,564.61 | 990.20 | 1,290,188 | 1,363,767 | 73,579 | 5.7 | Austin |
| 32 | Franklin | Ohio | 1,378.36 | 532.19 | 1,323,807 | 1,356,303 | 32,496 | 2.5 | Columbus |
| 33 | Oakland | Michigan | 2,247.24 | 867.66 | 1,274,395 | 1,296,888 | 22,493 | 1.8 | Pontiac |
| 34 | Hennepin | Minnesota | 1,433.79 | 553.59 | 1,281,565 | 1,273,334 | -8,231 | -0.6 | Minneapolis |
| 35 | Collin | Texas | 2,178.76 | 841.22 | 1,064,465 | 1,254,658 | 190,193 | 17.9 | McKinney |
| 36 | Cuyahoga | Ohio | 1,184.12 | 457.19 | 1,264,817 | 1,240,594 | -24,223 | -1.9 | Cleveland |
| 37 | Wake | North Carolina | 2,163.21 | 835.22 | 1,129,410 | 1,232,444 | 103,034 | 9.1 | Raleigh |
| 38 | Allegheny | Pennsylvania | 1,890.88 | 730.07 | 1,250,578 | 1,231,814 | -18,764 | -1.5 | Pittsburgh |
| 39 | Salt Lake | Utah | 1,922.50 | 742.28 | 1,185,238 | 1,216,274 | 31,036 | 2.6 | Salt Lake City |
| 40 | Mecklenburg | North Carolina | 1,356.75 | 523.84 | 1,115,482 | 1,206,285 | 90,803 | 8.1 | Charlotte |
| 41 | Contra Costa | California | 1,854.27 | 715.94 | 1,165,927 | 1,172,607 | 6,680 | 0.6 | Martinez |
| 42 | Fairfax | Virginia | 1,012.60 | 390.97 | 1,150,309 | 1,160,925 | 10,616 | 0.9 | Fairfax |
| 43 | Fulton | Georgia | 1,363.98 | 526.63 | 1,066,710 | 1,090,354 | 23,644 | 2.2 | Atlanta |
| 44 | Montgomery | Maryland | 1,272.34 | 491.25 | 1,062,061 | 1,082,273 | 20,212 | 1.9 | Rockville |
| 45 | Pima | Arizona | 23,794.31 | 9,187.04 | 1,043,433 | 1,080,149 | 36,716 | 3.5 | Tucson |
| 46 | Duval | Florida | 1,974.07 | 762.19 | 995,567 | 1,055,159 | 59,592 | 6.0 | Jacksonville |
| 47 | Denton | Texas | 2,275.13 | 878.43 | 906,422 | 1,045,120 | 138,698 | 15.3 | Denton |
| 48 | Fresno | California | 15,431.13 | 5,957.99 | 1,008,654 | 1,024,125 | 15,471 | 1.5 | Fresno |
| 49 | Westchester | New York | 1,114.98 | 430.50 | 1,004,457 | 1,006,447 | 1,990 | 0.2 | White Plains |
| 50 | Gwinnett | Georgia | 1,114.69 | 430.38 | 957,062 | 1,003,869 | 46,807 | 4.9 | Lawrenceville |
| 51 | Honolulu | Hawaii | 1,555.92 | 600.74 | 1,016,508 | 998,747 | -17,761 | -1.7 | Honolulu |
| 52 | St. Louis | Missouri | 1,315.20 | 507.80 | 1,004,125 | 992,929 | -11,196 | -1.1 | Clayton |
| 53 | Capitol | Connecticut | 2,660.80 | 1,027.34 | 976,248 | 991,508 | 15,260 | 1.6 | Hartford |
| 54 | Marion | Indiana | 1,026.41 | 396.30 | 977,203 | 981,628 | 4,425 | 0.5 | Indianapolis |
| 55 | Bergen | New Jersey | 603.49 | 233.01 | 955,732 | 978,641 | 22,909 | 2.4 | Hackensack |
| 56 | Prince George's | Maryland | 1,250.16 | 482.69 | 967,201 | 966,629 | -572 | -0.1 | Upper Marlboro |
| 57 | Pinellas | Florida | 709.14 | 273.80 | 959,107 | 965,870 | 6,763 | 0.7 | Clearwater |
| 58 | Fort Bend | Texas | 2,292 | 885 | 822,779 | 958,434 | 135,655 | 16.5 | Richmond |
| 59 | Erie | New York | 2,700.56 | 1,042.69 | 954,236 | 950,602 | -3,634 | -0.4 | Buffalo |
| 60 | Pierce | Washington | 4,324.01 | 1,669.51 | 921,130 | 941,170 | 20,040 | 2.2 | Tacoma |
| 61 | DuPage | Illinois | 848.22 | 327.50 | 932,877 | 937,142 | 4,265 | 0.5 | Wheaton |
| 62 | Milwaukee | Wisconsin | 625.23 | 241.40 | 939,489 | 924,740 | -14,749 | -1.6 | Milwaukee |
| 63 | Kern | California | 21,061.57 | 8,131.92 | 909,235 | 922,529 | 13,294 | 1.5 | Bakersfield |
| 64 | Hidalgo | Texas | 4,068.52 | 1,570.87 | 870,781 | 914,820 | 44,039 | 5.1 | Edinburg |
| 65 | Shelby | Tennessee | 1,976.61 | 763.17 | 929,744 | 910,530 | -19,214 | -2.1 | Memphis |
| 66 | Middlesex | New Jersey | 800.08 | 308.91 | 863,162 | 890,119 | 26,957 | 3.1 | New Brunswick |
| 67 | Macomb | Michigan | 1,241.18 | 479.22 | 881,217 | 886,175 | 4,958 | 0.6 | Mount Clemens |
| 68 | Essex | New Jersey | 326.89 | 126.21 | 863,728 | 881,527 | 17,799 | 2.1 | Newark |
| 69 | Worcester | Massachusetts | 3,912.88 | 1,510.77 | 862,111 | 881,248 | 19,137 | 2.2 | Worcester |
| 70 | Montgomery | Pennsylvania | 1,251.07 | 483.04 | 856,553 | 879,190 | 22,637 | 2.6 | Norristown |
| 71 | El Paso | Texas | 2,622.86 | 1,012.69 | 865,657 | 875,784 | 10,127 | 1.2 | El Paso |
| 72 | Snohomish | Washington | 5,406.01 | 2,087.27 | 827,957 | 864,113 | 36,156 | 4.4 | Everett |
| 73 | Lee | Florida | 2,031.88 | 784.51 | 760,822 | 860,959 | 100,137 | 13.2 | Fort Myers |
| 74 | Polk | Florida | 4,660 | 1,798 | 725,046 | 852,878 | 127,832 | 17.6 | Bartow |
| 75 | Baltimore | Maryland | 1,549.59 | 598.30 | 854,535 | 852,425 | -2,110 | -0.2 | Towson |
| 76 | Hamilton | Ohio | 1,051.30 | 405.91 | 830,639 | 837,359 | 6,720 | 0.8 | Cincinnati |
| 77 | Ventura | California | 4,773.69 | 1,843.13 | 843,843 | 835,427 | -8,416 | -1.0 | Ventura |
| 78 | San Francisco | California | 121.40 | 46.87 | 873,965 | 827,526 | -46,439 | -5.3 | San Francisco |
| 79 | Essex | Massachusetts | 1,275.73 | 492.56 | 809,829 | 823,938 | 14,109 | 1.7 | Salem and Lawrence |
| 80 | Oklahoma | Oklahoma | 1,835.83 | 708.82 | 796,292 | 816,490 | 20,198 | 2.5 | Oklahoma City |
| 81 | San Joaquin | California | 3,603.51 | 1,391.32 | 779,233 | 816,108 | 36,875 | 4.7 | Stockton |
| 82 | Multnomah | Oregon | 1,117.05 | 431.30 | 815,428 | 795,897 | -19,531 | -2.4 | Portland |
| 83 | Jefferson | Kentucky | 985.27 | 380.42 | 782,969 | 793,881 | 10,912 | 1.4 | Louisville |
| 84 | Suffolk | Massachusetts | 150.62 | 58.15 | 797,936 | 793,144 | -4,792 | -0.6 | Boston |
| 85 | Cobb | Georgia | 879.43 | 339.55 | 766,149 | 787,538 | 21,389 | 2.8 | Marietta |
| 86 | DeKalb | Georgia | 693.03 | 267.58 | 764,382 | 770,307 | 5,925 | 0.8 | Decatur |
| 87 | El Paso | Colorado | 5,508.39 | 2,126.80 | 730,395 | 752,772 | 22,377 | 3.1 | Colorado Springs |
| 88 | Monroe | New York | 1,702.15 | 657.21 | 759,443 | 752,202 | -7,241 | -1.0 | Rochester |
| 89 | Montgomery | Texas | 2,699.23 | 1,042.18 | 620,443 | 749,613 | 129,170 | 20.8 | Conroe |
| 90 | Utah | Utah | 5,188.91 | 2,003.45 | 659,399 | 747,234 | 87,835 | 13.3 | Provo |
| 91 | San Mateo | California | 1,161.37 | 448.41 | 764,442 | 742,893 | -21,549 | -2.8 | Redwood City |
| 92 | Norfolk | Massachusetts | 1,025.91 | 396.11 | 725,981 | 740,754 | 14,773 | 2.0 | Dedham |
| 93 | Hudson | New Jersey | 119.63 | 46.19 | 724,854 | 736,185 | 11,331 | 1.6 | Jersey City |
| 94 | Davidson | Tennessee | 1,305.44 | 504.03 | 715,884 | 729,505 | 13,621 | 1.9 | Nashville |
| 95 | Denver | Colorado | 401.36 | 154.97 | 715,522 | 729,019 | 13,497 | 1.9 | Denver |
| 96 | Williamson | Texas | 2,889.99 | 1,115.83 | 609,017 | 727,480 | 118,463 | 19.5 | Georgetown |
| 97 | Jackson | Missouri | 1,565.55 | 604.46 | 717,204 | 727,362 | 10,158 | 1.4 | Independence and Kansas City |
| 98 | Lake | Illinois | 1,149.10 | 443.67 | 714,342 | 718,604 | 4,262 | 0.6 | Waukegan |
| 99 | Will | Illinois | 2,167.58 | 836.91 | 696,355 | 708,583 | 12,228 | 1.8 | Joliet |
| 100 | District of Columbia | District of Columbia | 177.0 | 68.34 | 689,545 | 702,250 | 12,705 | 1.8 | N/A |

## Gallery

* Downtown Los Angeles, county seat of Los Angeles County, California, the most populous county in the United States
* Downtown Chicago in Cook County, Illinois, the second-most populous county in the United States
* Downtown Houston in Harris County, Texas, the third-most populous county in the United States
* Phoenix, Arizona, county seat of the Maricopa County, Arizona, the nation's fourth-most populous county
* Downtown San Diego, California. San Diego County is the fifth-most populous county in the United States
* South Coast Metro district in Orange County, California, the sixth-most populous county in the United States
* Downtown Miami in Miami-Dade County, the largest county in Florida and county seat of the seventh-most populous county in the United States
* Uptown, Dallas with Downtown Dallas on the end, in Dallas County, Texas, the eighth-most populous county in the United States
* Brooklyn in Kings County, New York, the ninth-most populous county in the United States
* Riverside, California, the county seat of Riverside County, California, the tenth-most populous county in the United States