# Lista de condados dos Estados Unidos por população

Esta é uma lista dos cem condados mais populosos dos Estados Unidos e o Distrito de Columbia, em ordem decrescente. Os números são do censo nacional realizado em 2010 e 2020 pelo Departamento do Censo dos Estados Unidos (USCB).
| Posição | Condado | Estado | Área | Área | População | População | Crescimento 2010-2020 | Crescimento 2010-2020 | Sede do Condado |
| Posição | Condado | Estado | km$^2$ | mi$^2$ | Censo 2010 | Censo 2020 | absoluto | % | Sede do Condado |
| 1 | Los Angeles | Califórnia | 10,509.87 | 4,057.88 | 9,818,605 | 10,014,009 | 195,404 | 2.0 | Los Angeles |
| 2 | Cook | Illinois | 2,448.38 | 945.33 | 5,194,675 | 5,275,541 | 80,866 | 1.6 | Chicago |
| 3 | Harris | Texas | 4,411.99 | 1,703.48 | 4,092,459 | 4,731,145 | 638,686 | 15.6 | Houston |
| 4 | Maricopa | Arizona | 23,828.26 | 9,200.14 | 3,817,117 | 4,420,568 | 603,451 | 15.8 | Phoenix |
| 5 | San Diego | Califórnia | 10,895.12 | 4,206.63 | 3,095,313 | 3,298,634 | 203,321 | 6.6 | San Diego |
| 6 | Orange | Califórnia | 2,047.56 | 790.57 | 3,010,232 | 3,186,989 | 176,757 | 5.9 | Santa Ana |
| 7 | Kings | Nova Iorque | 183.41 | 70.82 | 2,504,700 | 2,736,074 | 231,374 | 9.2 | Brooklyn |
| 8 | Miami-Dade | Flórida | 4,915.06 | 1,897.72 | 2,496,435 | 2,701,767 | 205,332 | 8.2 | Miami |
| 9 | Dallas | Texas | 2,256.60 | 871.28 | 2,368,139 | 2,613,539 | 245,400 | 10.4 | Dallas |
| 10 | Riverside | Califórnia | 18,664.70 | 7,206.48 | 2,189,641 | 2,418,185 | 228,544 | 10.4 | Riverside |
| 11 | Queens | Nova Iorque | 281.10 | 108.53 | 2,230,722 | 2,405,464 | 174,742 | 7.8 | Queens |
| 12 | King | Washington | 5,479.29 | 2,115.57 | 1,931,249 | 2,269,675 | 338,426 | 17.5 | Seattle |
| 13 | Clark | Nevada | 20,438.71 | 7,891.43 | 1,951,269 | 2,265,461 | 314,192 | 16.1 | Las Vegas |
| 14 | San Bernardino | Califórnia | 51,947.23 | 20,056.94 | 2,035,210 | 2,181,654 | 146,444 | 7.2 | San Bernardino |
| 15 | Tarrant | Texas | 2,236.74 | 863.61 | 1,809,034 | 2,110,640 | 301,606 | 16.7 | Fort Worth |
| 16 | Bexar | Texas | 3,211.12 | 1,239.82 | 1,714,773 | 2,009,324 | 294,551 | 17.2 | San Antonio |
| 17 | Broward | Flórida | 3,133.33 | 1,209.79 | 1,748,066 | 1,944,375 | 196,309 | 11.2 | Fort Lauderdale |
| 18 | Santa Clara | Califórnia | 3,341.34 | 1,290.10 | 1,781,642 | 1,936,259 | 154,617 | 8.7 | San Jose |
| 19 | Wayne | Michigan | 1,585.28 | 612.08 | 1,820,584 | 1,793,561 | -27,023 | -1.5 | Detroit |
| 20 | Nova Iorque | Nova Iorque | 59.13 | 22.83 | 1,585,873 | 1,694,251 | 108,378 | 6.8 | Manhattan |
| 21 | Alameda | Califórnia | 1,914.05 | 739.02 | 1,510,271 | 1,682,353 | 172,082 | 11.4 | Oakland |
| 22 | Middlesex | Massachusetts | 2,118.14 | 817.82 | 1,503,085 | 1,632,002 | 128,917 | 8.6 | Lowell e Cambridge |
| 23 | Filadélfia | Pensilvânia | 347.32 | 134.10 | 1,526,006 | 1,603,797 | 77,791 | 5.1 | Filadélfia |
| 24 | Sacramento | Califórnia | 2,498.42 | 964.64 | 1,418,788 | 1,585,055 | 166,267 | 11.7 | Sacramento |
| 25 | Suffolk | Nova Iorque | 2,362.20 | 912.05 | 1,493,350 | 1,525,920 | 32,570 | 2.2 | Riverhead |
| 26 | Palm Beach | Flórida | 5,100.00 | 1,970.00 | 1,320,134 | 1,492,191 | 172,057 | 13.0 | West Palm Beach |
| 27 | Bronx | Nova Iorque | 109.03 | 42.10 | 1,385,108 | 1,472,654 | 87,546 | 6.3 | Bronx |
| 28 | Hillsborough | Flórida | 2,642.34 | 1,020.21 | 1,229,226 | 1,459,762 | 230,536 | 18.8 | Tampa |
| 29 | Orange | Flórida | 2,339.87 | 903.43 | 1,145,956 | 1,429,908 | 283,952 | 24.8 | Orlando |
| 30 | Nassau | Nova Iorque | 737.41 | 284.72 | 1,339,532 | 1,395,774 | 56,242 | 4.2 | Mineola |
| 31 | Franklin | Ohio | 1,378.36 | 532.19 | 1,163,414 | 1,323,807 | 160,393 | 13.8 | Columbus |
| 32 | Travis | Texas | 2,564.61 | 990.20 | 1,024,266 | 1,290,188 | 265,922 | 26.0 | Austin |
| 33 | Hennepin | Minnesota | 1,433.79 | 553.59 | 1,152,425 | 1,281,565 | 129,140 | 11.2 | Minneapolis |
| 34 | Oakland | Michigan | 2,247.24 | 867.66 | 1,202,362 | 1,274,395 | 72,033 | 6.0 | Pontiac |
| 35 | Cuyahoga | Ohio | 1,184.12 | 457.19 | 1,280,122 | 1,264,817 | -15,305 | -1.2 | Cleveland |
| 36 | Allegheny | Pensilvânia | 1,890.88 | 730.07 | 1,223,348 | 1,250,578 | 27,230 | 2.2 | Pittsburgh |
| 37 | Salt Lake | Utah | 1,922.50 | 742.28 | 1,029,655 | 1,185,238 | 155,583 | 15.1 | Salt Lake City |
| 38 | Contra Costa | Califórnia | 1,854.27 | 715.94 | 1,049,025 | 1,165,927 | 116,902 | 11.1 | Martinez |
| 39 | Fairfax | Virgínia | 1,012.60 | 390.97 | 1,081,726 | 1,150,309 | 68,583 | 6.3 | Fairfax |
| 40 | Wake | Carolina do Norte | 2,163.21 | 835.22 | 900,993 | 1,129,410 | 228,417 | 25.4 | Raleigh |
| 41 | Mecklenburg | Carolina do Norte | 1,356.75 | 523.84 | 919,628 | 1,115,482 | 195,854 | 21.3 | Charlotte |
| 42 | Fulton | Geórgia | 1,363.98 | 526.63 | 920,581 | 1,066,710 | 146,129 | 15.9 | Atlanta |
| 43 | Collin | Texas | 2,178.76 | 841.22 | 782,341 | 1,064,465 | 282,124 | 36.1 | McKinney |
| 44 | Montgomery | Maryland | 1,272.34 | 491.25 | 971,777 | 1,062,061 | 90,284 | 9.3 | Rockville |
| 45 | Pima | Arizona | 23,794.31 | 9,187.04 | 980,263 | 1,043,433 | 63,170 | 6.4 | Tucson |
| 46 | Honolulu | Havaí | 1,555.92 | 600.74 | 953,207 | 1,016,508 | 63,301 | 6.6 | Honolulu |
| 47 | Fresno | Califórnia | 15,431.13 | 5,957.99 | 930,450 | 1,008,654 | 78,204 | 8.4 | Fresno |
| 48 | Westchester | Nova Iorque | 1,114.98 | 430.50 | 949,113 | 1,004,457 | 55,344 | 5.8 | White Plains |
| 49 | St. Louis | Missouri | 1,315.20 | 507.80 | 998,954 | 1,004,125 | 5,171 | 0.5 | Clayton |
| 50 | Duval | Flórida | 1,974.07 | 762.19 | 864,263 | 995,567 | 131,304 | 15.2 | Jacksonville |
| 51 | Marion | Indiana | 1,026.41 | 396.30 | 903,393 | 977,203 | 73,810 | 8.2 | Indianápolis |
| 52 | Prince George's | Maryland | 1,250.16 | 482.69 | 863,420 | 967,201 | 103,781 | 10.7 | Upper Marlboro |
| 53 | Pinellas | Flórida | 709.14 | 273.80 | 916,542 | 959,107 | 42,565 | 4.6 | Clearwater |
| 54 | Fairfield | Connecticut | 1,618.46 | 624.89 | 916,829 | 957,419 | 40,590 | 4.4 | ─ |
| 55 | Gwinnett | Geórgia | 1,114.69 | 430.38 | 805,321 | 957,062 | 151,741 | 18.8 | Lawrenceville |
| 56 | Bergen | Nova Jérsei | 603.49 | 233.01 | 905,116 | 955,732 | 50,616 | 5.6 | Hackensack |
| 57 | Erie | Nova Iorque | 2,700.56 | 1,042.69 | 919,040 | 954,236 | 35,196 | 3.8 | Buffalo |
| 58 | Milwaukee | Wisconsin | 625.23 | 241.40 | 947,735 | 939,489 | -8,246 | -0.9 | Milwaukee |
| 59 | DuPage | Illinois | 848.22 | 327.50 | 916,924 | 932,877 | 15,953 | 1.7 | Wheaton |
| 60 | Shelby | Tennessee | 1,976.61 | 763.17 | 927,644 | 929,744 | 2,100 | 0.2 | Memphis |
| 61 | Pierce | Washington | 4,324.01 | 1,669.51 | 795,225 | 921,130 | 125,905 | 15.8 | Tacoma |
| 62 | Kern | Califórnia | 21,061.57 | 8,131.92 | 839,631 | 909,235 | 69,604 | 8.3 | Bakersfield |
| 63 | Denton | Texas | 2,275.13 | 878.43 | 662,614 | 906,422 | 243,808 | 36.8 | Denton |
| 64 | Hartford | Connecticut | 1,903.89 | 735.10 | 894,014 | 899,498 | 5,484 | 0.6 | Hartford |
| 65 | Macomb | Michigan | 1,241.18 | 479.22 | 840,978 | 881,217 | 40,239 | 4.8 | Mount Clemens |
| 66 | São Francisco | Califórnia | 121.40 | 46.87 | 805,235 | 873,965 | 68,730 | 8.5 | São Francisco |
| 67 | Hidalgo | Texas | 4,068.52 | 1,570.87 | 774,769 | 870,781 | 96,012 | 12.4 | Edinburg |
| 68 | El Paso | Texas | 2,622.86 | 1,012.69 | 800,647 | 865,657 | 65,010 | 8.1 | El Paso |
| 69 | New Haven | Connecticut | 1,565.66 | 604.51 | 862,477 | 864,835 | 2,358 | 0.3 | ─ |
| 70 | Essex | Nova Jérsei | 326.89 | 126.21 | 783,969 | 863,728 | 79,759 | 10.2 | Newark |
| 71 | Middlesex | Nova Jérsei | 800.08 | 308.91 | 809,858 | 863,162 | 53,304 | 6.6 | New Brunswick |
| 72 | Worcester | Massachusetts | 3,912.88 | 1,510.77 | 798,552 | 862,111 | 63,559 | 8.0 | Worcester |
| 73 | Montgomery | Pensilvânia | 1,251.07 | 483.04 | 799,874 | 856,553 | 56,679 | 7.1 | Norristown |
| 74 | Baltimore | Maryland | 1,549.59 | 598.30 | 805,029 | 854,535 | 49,506 | 6.1 | Towson |
| 75 | Ventura | Califórnia | 4,773.69 | 1,843.13 | 823,318 | 843,843 | 20,525 | 2.5 | Ventura |
| 76 | Hamilton | Ohio | 1,051.30 | 405.91 | 802,374 | 830,639 | 28,265 | 3.5 | Cincinnati |
| 77 | Snohomish | Washington | 5,406.01 | 2,087.27 | 713,335 | 827,957 | 114,622 | 16.1 | Everett |
| 78 | Fort Bend | Texas | 2,292 | 885 | 585,375 | 822,779 | 237,404 | 40.6 | Richmond |
| 79 | Multnomah | Oregon | 1,117.05 | 431.30 | 735,334 | 815,428 | 80,094 | 10.9 | Portland |
| 80 | Essex | Massachusetts | 1,275.73 | 492.56 | 743,159 | 809,829 | 66,670 | 9.0 | Salem e Lawrence |
| 81 | Suffolk | Massachusetts | 150.62 | 58.15 | 722,023 | 797,936 | 75,913 | 10.5 | Boston |
| 82 | Oklahoma | Oklahoma | 1,835.83 | 708.82 | 718,633 | 796,292 | 77,659 | 10.8 | Oklahoma City |
| 83 | Jefferson | Kentucky | 985.27 | 380.42 | 741,096 | 782,969 | 41,873 | 5.7 | Louisville |
| 84 | San Joaquin | Califórnia | 3,603.51 | 1,391.32 | 685,306 | 779,233 | 93,927 | 13.7 | Stockton |
| 85 | Cobb | Geórgia | 879.43 | 339.55 | 688,078 | 766,149 | 78,071 | 11.3 | Marietta |
| 86 | San Mateo | Califórnia | 1,161.37 | 448.41 | 718,451 | 764,442 | 45,991 | 6.4 | Redwood City |
| 87 | DeKalb | Geórgia | 693.03 | 267.58 | 691,893 | 764,382 | 72,489 | 10.5 | Decatur |
| 88 | Lee | Flórida | 2,031.88 | 784.51 | 618,754 | 760,822 | 142,068 | 23.0 | Fort Myers |
| 89 | Monroe | Nova Iorque | 1,702.15 | 657.21 | 744,344 | 759,443 | 15,099 | 2.0 | Rochester |
| 90 | El Paso | Colorado | 5,508.39 | 2,126.80 | 622,263 | 730,395 | 108,132 | 17.4 | Colorado Springs |
| 91 | Norfolk | Massachusetts | 1,025.91 | 396.11 | 670,850 | 725,981 | 55,131 | 8.2 | Dedham |
| 92 | Polk | Flórida | 4,660 | 1,798 | 602,095 | 725,046 | 122,951 | 20.4 | Bartow |
| 93 | Hudson | Nova Jérsei | 119.63 | 46.19 | 634,266 | 724,854 | 90,588 | 12.5 | Jersey City |
| 94 | Jackson | Missouri | 1,565.55 | 604.46 | 674,158 | 717,204 | 43,046 | 6.4 | Independence e Kansas City |
| 95 | Davidson | Tennessee | 1,305.44 | 504.03 | 626,681 | 715,884 | 89,203 | 14.2 | Nashville |
| 96 | Denver | Colorado | 401.36 | 154.97 | 600,158 | 715,522 | 115,364 | 19.2 | Denver |
| 97 | Lake | Illinois | 1,149.10 | 443.67 | 703,462 | 714,342 | 10,880 | 1.5 | Waukegan |
| 98 | Will | Illinois | 2,167.58 | 836.91 | 677,560 | 696,355 | 18,795 | 2.8 | Joliet |
| 99 | Distrito de Colúmbia | Distrito de Colúmbia | 177.0 | 68.34 | 601,723 | 689,545 | 87,822 | 14.6 | ─ |
| 100 | Bernalillo | Novo México | 3,006.53 | 1,160.83 | 662,564 | 676,444 | 13,880 | 2.1 | Albuquerque |

## Condados com maior crescimento populacional

Lista baseada nos condados com população superior a 10 000 e inferior a 700 000, com maior crescimento percentual, segundo o censo de 2020.
| Posição | Condado | Estado | Censo 2010 | Censo 2020 | % Crescimento |
| 1 | Williams | Dakota do Norte | 22 399 | 37 589 | 67,8% |
| 2 | Hays | Texas | 157 103 | 230 191 | 46,5% |
| 3 | Wasatch | Utah | 23 525 | 34 091 | 44,9% |
| 4 | Comal | Texas | 108 520 | 156 209 | 43,9% |
| 5 | Kendall | Texas | 33 384 | 47 431 | 42,1% |
| 6 | Sumter | Flórida | 93 420 | 132 420 | 41,7% |
| 7 | Dallas | Iowa | 66 139 | 93 453 | 41,3% |
| 8 | Osceola | Flórida | 268 685 | 375 751 | 39,8% |
| 9 | Williamson | Texas | 422 504 | 590 551 | 39,8% |
| 10 | St. Johns | Flórida | 190 038 | 264 672 | 39,3% |

## Condados menos populosos

Menos da metade dos 3.143 (47%) condados ou equivalentes do país ganharam população de 2010 a 2020, enquanto as populações de cerca de quatro quintos (⅘) das áreas metropolitanas cresceram durante o período.
| Posição | Condado | Estado | Censo 2000 | Censo 2010 | Censo 2020 | % Crescimento 2010-2020 |
| 1 | Condado de Loving | Texas | 67 | 82 | 64 | -22,0% |
| 2 | Condado de Kalawao | Havaí | 147 | 90 | 82 | -8,9% |
| 3 | Condado de King | Texas | 356 | 286 | 265 | -7,3% |
| 4 | Condado de Kenedy | Texas | 414 | 416 | 350 | -15,9% |
| 5 | Condado de McPherson | Nebraska | 533 | 539 | 399 | -26,0% |
| 6 | Condado de Blaine | Nebraska | 583 | 478 | 431 | -9,8% |
| 7 | Condado de Arthur | Nebraska | 444 | 460 | 434 | -5,7% |
| 8 | Condado de Petroleum | Montana | 493 | 494 | 496 | 0,4% |
| 9 | Condado de McMullen | Texas | 851 | 707 | 600 | -15,1% |
| 10 | Condado de Grant | Nebraska | 747 | 614 | 611 | -0,5% |
| 11 | Condado de Borden | Texas | 729 | 641 | 631 | -1,6% |
| 12 | Condado de Harding | Novo México | 810 | 695 | 657 | -5,5% |
| 13 | Condado de San Juan | Colorado | 558 | 699 | 705 | 0,9% |
| 14 | Condado de Slope | Dakota do Norte | 767 | 727 | 706 | -2,9% |
| 15 | Condado de Esmeralda | Nevada | 971 | 783 | 729 | -6,9% |
| 16 | Condado de Terrell | Texas | 1 081 | 984 | 760 | -21,1% |
| 17 | Condado de Treasure | Montana | 861 | 718 | 762 | 6,1% |
| 18 | Condado de Hinsdale | Colorado | 790 | 843 | 788 | -6,5% |
| 19 | Condado de Clark | Idaho | 1 022 | 982 | 790 | -19,6% |
| 20 | Condado de Golden Valley | Montana | 1 042 | 884 | 823 | -6,9% |
| 21 | Condado de Mineral | Colorado | 831 | 712 | 865 | 21,5% |
| 22 | Condado de Billings | Dakota do Norte | 888 | 783 | 945 | 20,7% |
| 23 | Condado de Prairie | Montana | 1 199 | 1 179 | 1 088 | -7,7% |
| 24 | Condado de Garfield | Montana | 1 279 | 1 206 | 1 173 | -2,7% |
| 25 | Condado de Alpine | Califórnia | 1 208 | 1 175 | 1 204 | 2,5% |