List of the most populous counties in the United States

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See also: List of the largest counties in the United States by area
File:U.S. counties population.JPG
A map of the counties and county equivalents of the United States. The 100 most populous counties are highlighted, with counties having more than one million residents in orange, and counties having fewer than one million residents in green, based on the results of the April 1, 2010 United States census.

This is a list of the 100 largest counties in the United States by population based on the national decennial US census conducted on 1 April 2010 and subsequent mid-2010 and mid-2011 official estimates released by the United States Census Bureau (USCB).

Many of the counties on the list include major cities or metropolitan areas. Five 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 and City and County of Denver.[1][2][3] Queens County, Kings County, New York County, Bronx County, and Richmond County, New York are coterminous with boroughs of New York City, fall under the jurisdiction of the combined city government, and therefore lack a county seat (with the exception of Queens, whose county seat is Jamaica). Each of the four most populous counties is listed instead with the location of its county courthouse.

List of the most populous US counties sorted according to the mid-2014 official estimate by the USCB

Rank County State Land
area
(km²)[4]		 Land
area
(mi²)[5]		 April 1,
2010
census
[6]		 April 1,
2010
density
(/km²)		 April 1,
2010
density
(/mi²)		 July 1,
2010
official
estimate
 July 1,
2010
density
(/km²)		 July 1,
2010
density
(/mi²)		 July 1,
2014
official
estimate
 July 1,
2014
density
(/km²)		 July 1,
2014
density
(/mi²)		 Mid-2010
to
mid-2014
change
(Absolute)		 Mid-2010
to
mid-2014
change
(%)		 County seat
or courthouse
1 Los Angeles County California 10,509.87 4,057.88 9,818,605 934 2,420 9,826,773 935 2,422 10,116,705 963 2,493 289,932 2.95 Los Angeles
2 Cook County Illinois 2,448.38 945.33 5,194,675 2,122 5,495 5,199,971 2,124 5,501 5,246,456 2,143 5,550 46,485 0.89 Chicago
3 Harris County Texas 4,411.99 1,703.48 4,092,459 928 2,402 4,109,362 931 2,412 4,441,370 1,007 2,607 332,008 8.08 Houston
4 Maricopa County Arizona 23,828.26 9,200.14 3,817,117 160 415 3,824,834 161 416 4,087,191 172 444 262,357 6.86 Phoenix
5 San Diego County California 10,895.12 4,206.63 3,095,313 284 736 3,105,115 285 738 3,263,431 300 776 158,316 5.10 San Diego
6 Orange County California 2,047.56 790.57 3,010,232 1,470 3,808 3,017,598 1,474 3,817 3,145,515 1,536 3,979 127,917 4.24 Santa Ana
7 Miami-Dade County Florida 4,915.06 1,897.72 2,496,435 508 1,315 2,503,034 509 1,319 2,662,874 542 1,403 159,840 6.00 Miami
8 Kings County New York 183.41 70.82 2,504,700 13,656 35,370 2,508,515 13,677 35,423 2,621,793 14,295 37,021 113,278 4.52 Brooklyn
9 Dallas County Texas 2,256.60 871.28 2,368,139 1,049 2,718 2,375,207 1,053 2,726 2,518,638 1,116 2,891 143,431 6.04 Dallas
10 Riverside County California 18,664.70 7,206.48 2,189,641 117 304 2,202,978 118 306 2,329,271 125 323 126,293 5.73 Riverside
11 Queens County New York 281.10 108.53 2,230,722 7,936 20,553 2,233,895 7,947 20,583 2,321,580 8,259 21,391 87,685 3.93 Jamaica
12 San Bernardino County California 51,947.23 20,056.94 2,035,210 39 101 2,042,027 39 102 2,112,619 41 105 70,592 3.46 San Bernardino
13 King County Washington 5,479.29 2,115.57 1,931,249 352 913 1,937,157 354 916 2,079,967 380 983 142,810 7.37 Seattle
14 Clark County Nevada 20,438.71 7,891.43 1,951,269 95 247 1,953,927 96 248 2,069,681 101 262 115,754 5.92 Las Vegas
15 Tarrant County Texas 2,236.74 863.61 1,809,034 809 2,095 1,816,850 812 2,104 1,945,360 870 2,253 128,510 7.07 Fort Worth
16 Santa Clara County California 3,341.34 1,290.10 1,781,642 533 1,381 1,786,267 535 1,385 1,894,605 567 1,469 108,338 6.07 San Jose
17 Broward County Florida 3,133.33 1,209.79 1,748,066 558 1,445 1,752,122 559 1,448 1,869,235 597 1,545 117,113 6.68 Fort Lauderdale
18 Bexar County Texas 3,211.12 1,239.82 1,714,773 534 1,383 1,723,561 537 1,390 1,855,866 578 1,497 132,305 7.68 San Antonio
19 Wayne County Michigan 1,585.28 612.08 1,820,584 1,148 2,974 1,815,246 1,145 2,966 1,764,804 1,113 2,883 -50,442 -2.78 Detroit
20 New York County New York 59.13 22.83 1,585,873 26,820 69,464 1,587,481 26,847 69,534 1,636,268 27,672 71,672 48,787 3.07 New York
21 Philadelphia County Pennsylvania 347.32 134.10 1,526,006 4,394 11,380 1,528,074 4,400 11,395 1,536,471 4,424 11,458 8,397 0.55 Philadelphia
22 Alameda County California 1,914.05 739.02 1,510,271 789 2,044 1,513,043 790 2,047 1,529,875 799 2,070 16,832 1.11 Oakland
23 Middlesex County Massachusetts 2,118.14 817.82 1,503,085 710 1,838 1,505,720 711 1,841 1,518,171 717 1,856 12,451 0.83 Cambridge
24 Suffolk County New York 2,362.20 912.05 1,493,350 632 1,637 1,494,388 633 1,638 1,498,816 635 1,643 4,428 0.30 Riverhead
25 Sacramento County California 2,498.42 964.64 1,418,788 568 1,471 1,422,094 569 1,474 1,436,105 575 1,489 14,011 0.99 Sacramento
26 Bronx County New York 109.03 42.10 1,385,108 12,704 32,903 1,387,159 12,723 32,952 1,392,002 12,767 33,067 4,843 0.35 Bronx
27 Nassau County New York 737.41 284.72 1,339,532 1,817 4,705 1,341,033 1,819 4,710 1,344,436 1,823 4,722 3,403 0.25 Mineola
28 Palm Beach County Florida 5,101.66 1,969.76 1,320,134 259 670 1,322,924 259 672 1,335,187 262 678 12,263 0.93 West Palm Beach
29 Cuyahoga County Ohio 1,184.12 457.19 1,280,122 1,081 2,800 1,278,000 1,079 2,795 1,270,294 1,073 2,778 -7,706 -0.60 Cleveland
30 Hillsborough County Florida 2,642.34 1,020.21 1,229,226 465 1,205 1,233,373 467 1,209 1,267,775 480 1,243 34,402 2.79 Tampa
31 Allegheny County Pennsylvania 1,890.88 730.07 1,223,348 647 1,676 1,224,833 648 1,678 1,227,066 649 1,681 2,233 0.18 Pittsburgh
32 Oakland County Michigan 2,247.24 867.66 1,202,362 535 1,386 1,202,682 535 1,386 1,210,145 539 1,395 7,463 0.62 Pontiac
33 Franklin County Ohio 1,378.36 532.19 1,163,414 844 2,186 1,165,789 846 2,191 1,178,799 855 2,215 13,010 1.12 Columbus
34 Orange County Florida 2,339.87 903.43 1,145,956 490 1,268 1,148,787 491 1,272 1,169,107 500 1,294 20,320 1.77 Orlando
35 Hennepin County Minnesota 1,433.79 553.59 1,152,425 804 2,082 1,154,067 805 2,085 1,168,431 815 2,111 14,364 1.24 Minneapolis
36 Fairfax County Virginia 1,012.60 390.97 1,081,726 1,068 2,767 1,085,934 1,072 2,778 1,100,692 1,087 2,815 14,758 1.36 Fairfax
37 Contra Costa County California 1,854.27 715.94 1,049,025 566 1,465 1,052,605 568 1,470 1,066,096 575 1,489 13,491 1.28 Martinez
38 Travis County Texas 2,564.61 990.20 1,024,266 399 1,034 1,030,588 402 1,041 1,063,130 415 1,074 32,542 3.16 Austin
39 Salt Lake County Utah 1,922.50 742.28 1,029,655 536 1,387 1,033,223 537 1,392 1,048,985 546 1,413 15,762 1.53 Salt Lake City
40 St. Louis County Missouri 1,315.20 507.80 998,954 760 1,967 998,772 759 1,967 998,692 759 1,967 -80 -0.01 Clayton
41 Montgomery County Maryland 1,272.34 491.25 971,777 764 1,978 975,439 767 1,986 989,794 778 2,015 14,355 1.47 Rockville
42 Pima County Arizona 23,794.31 9,187.04 980,263 41 107 982,108 41 107 989,569 42 108 7,461 0.76 Tucson
43 Honolulu County Hawaii 1,555.92 600.74 953,207 613 1,587 955,636 614 1,591 963,607 619 1,604 7,971 0.83 Honolulu
44 Westchester County New York 1,114.98 430.50 949,113 851 2,205 950,283 852 2,207 955,899 857 2,220 5,616 0.59 White Plains
45 Milwaukee County Wisconsin 625.23 241.40 947,735 1,516 3,926 948,623 1,517 3,930 952,532 1,523 3,946 3,909 0.41 Milwaukee
46 Fulton County Georgia 1,363.98 526.63 920,581 675 1,748 925,920 679 1,758 949,599 696 1,803 23,679 2.56 Atlanta
47 Mecklenburg County North Carolina 1,356.75 523.84 919,628 678 1,756 923,141 680 1,762 944,373 696 1,803 21,232 2.30 Charlotte
48 Fresno County California 15,431.13 5,957.99 930,450 60 156 933,168 60 157 942,904 61 158 9,736 1.04 Fresno
49 Shelby County Tennessee 1,976.61 763.17 927,644 469 1,216 928,930 470 1,217 935,088 473 1,225 6,158 0.66 Memphis
50 Wake County North Carolina 2,163.21 835.22 900,993 417 1,079 906,788 419 1,086 929,780 430 1,113 22,992 2.54 Raleigh
51 Fairfield County Connecticut 1,618.46 624.89 916,829 566 1,467 918,339 567 1,470 925,899 572 1,482 7,560 0.82 Bridgeport
52 DuPage County Illinois 848.22 327.50 916,924 1,081 2,800 917,942 1,082 2,803 923,222 1,088 2,819 5,280 0.58 Wheaton
53 Erie County New York 2,700.56 1,042.69 919,040 340 881 918,751 340 881 918,028 340 880 -,723 -0.08 Buffalo
54 Pinellas County Florida 709.14 273.80 916,542 1,292 3,347 916,220 1,292 3,346 917,398 1,294 3,351 1,178 0.13 Clearwater
55 Marion County Indiana 1,026.41 396.30 903,393 880 2,280 904,789 882 2,283 911,296 888 2,300 6,507 0.72 Indianapolis
56 Bergen County New Jersey 603.49 233.01 905,116 1,500 3,884 906,184 1,502 3,889 911,004 1,510 3,910 4,820 0.53 Hackensack
57 Hartford County Connecticut 1,903.89 735.10 894,014 470 1,216 894,127 470 1,216 894,705 470 1,217 578 0.06 Hartford
58 Prince George's County Maryland 1,250.16 482.69 863,420 691 1,789 865,219 692 1,792 871,233 697 1,805 6,014 0.70 Upper Marlboro
59 Duval County Florida 1,974.07 762.19 864,263 438 1,134 865,420 438 1,135 870,709 441 1,142 5,289 0.61 Jacksonville
60 New Haven County Connecticut 1,565.66 604.51 862,477 551 1,427 862,438 551 1,427 861,113 550 1,424 -1,325 -0.15 New Haven and Waterbury
61 Kern County California 21,061.57 8,131.92 839,631 40 103 842,813 40 104 851,710 40 105 8,897 1.06 Bakersfield
62 Macomb County Michigan 1,241.18 479.22 840,978 678 1,755 840,944 678 1,755 842,145 679 1,757 1,201 0.14 Mount Clemens
63 Ventura County California 4,773.69 1,843.13 823,318 172 447 825,445 173 448 831,771 174 451 6,326 0.77 Ventura
64 Gwinnett County Georgia 1,114.69 430.38 805,321 722 1,871 808,291 725 1,878 824,941 740 1,917 16,650 2.06 Lawrenceville
65 El Paso County Texas 2,622.86 1,012.69 800,647 305 791 803,995 307 794 820,790 313 811 16,795 2.09 El Paso
66 Middlesex County New Jersey 800.08 308.91 809,858 1,012 2,622 810,747 1,013 2,625 814,217 1,018 2,636 3,470 0.43 New Brunswick
67 San Francisco County California 121.40 46.87 805,235 6,633 17,179 805,340 6,634 17,181 812,826 6,695 17,341 7,486 0.93 San Francisco
68 Collin County Texas 2,178.76 841.22 782,341 359 930 788,511 362 937 812,226 373 966 23,715 3.01 McKinney
69 Baltimore County Maryland 1,549.59 598.30 805,029 520 1,346 805,964 520 1,347 809,941 523 1,354 3,977 0.49 Towson
70 Pierce County Washington 4,324.01 1,669.51 795,225 184 476 795,371 184 476 807,904 187 484 12,533 1.58 Tacoma
71 Montgomery County Pennsylvania 1,251.07 483.04 799,874 639 1,656 800,482 640 1,657 804,210 643 1,665 3,728 0.47 Norristown
72 Worcester County Massachusetts 3,912.88 1,510.77 798,552 204 529 799,300 204 529 801,227 205 530 1,927 0.24 Worcester
73 Hamilton County Ohio 1,051.30 405.91 802,374 763 1,977 801,948 763 1,976 800,362 761 1,972 -1,586 -0.20 Cincinnati
74 Hidalgo County Texas 4,068.52 1,570.87 774,769 190 493 780,030 192 497 797,810 196 508 17,780 2.28 Edinburg
75 Essex County New Jersey 326.89 126.21 783,969 2,398 6,211 784,099 2,399 6,213 785,137 2,402 6,221 1,038 0.13 Newark
76 Essex County Massachusetts 1,275.73 492.56 743,159 583 1,509 744,484 584 1,511 748,930 587 1,520 4,446 0.60 Salem
77 Multnomah County Oregon 1,117.05 431.30 735,334 658 1,705 737,476 660 1,710 748,031 670 1,734 10,555 1.43 Portland
78 Jefferson County Kentucky 985.27 380.42 741,096 752 1,948 742,176 753 1,951 746,906 758 1,963 4,730 0.64 Louisville
79 Monroe County New York 1,702.15 657.21 744,344 437 1,133 744,635 437 1,133 745,625 438 1,135 990 0.13 Rochester
80 Oklahoma County Oklahoma 1,835.83 708.82 718,633 391 1,014 721,298 393 1,018 732,371 399 1,033 11,073 1.54 Oklahoma City
81 Suffolk County Massachusetts 150.62 58.15 722,023 4,794 12,416 722,731 4,798 12,428 730,932 4,853 12,569 8,201 1.13 Boston
82 San Mateo County California 1,161.37 448.41 718,451 619 1,602 719,604 620 1,605 727,209 626 1,622 7,605 1.06 Redwood City
83 Snohomish County Washington 5,406.01 2,087.27 713,335 132 342 715,358 132 343 722,400 134 346 7,042 0.98 Everett
84 Lake County Illinois 1,149.10 443.67 703,462 612 1,586 704,492 613 1,588 706,222 615 1,592 1,730 0.25 Waukegan
85 DeKalb County Georgia 693.03 267.58 691,893 998 2,586 692,858 1,000 2,589 699,893 1,010 2,616 7,035 1.02 Decatur
86 Cobb County Georgia 879.43 339.55 688,078 782 2,026 689,749 784 2,031 697,553 793 2,054 7,804 1.13 Marietta
87 San Joaquin County California 3,603.51 1,391.32 685,306 190 493 687,661 191 494 696,214 193 500 8,553 1.24 Stockton
88 Denton County Texas 2,275.13 878.43 662,614 291 754 667,138 293 759 686,406 302 781 19,268 2.89 Denton
89 Will County Illinois 2,167.58 836.91 677,560 313 810 678,873 313 811 681,545 314 814 2,672 0.39 Joliet
90 Jackson County Missouri 1,565.55 604.46 674,158 431 1,115 674,953 431 1,117 676,360 432 1,119 1,407 0.21 Independence, Missouri and Kansas City
91 Norfolk County Massachusetts 1,025.91 396.11 670,850 654 1,694 672,107 655 1,697 675,436 658 1,705 3,329 0.50 Dedham
92 Bernalillo County New Mexico 3,006.53 1,160.83 662,564 220 571 664,425 221 572 670,968 223 578 6,543 0.98 Albuquerque
93 Jefferson County Alabama 2,878.19 1,111.28 658,466 229 593 658,386 229 592 658,931 229 593 545 0.08 Birmingham
94 Hudson County New Jersey 119.63 46.19 634,266 5,302 13,732 634,979 5,308 13,747 641,224 5,360 13,882 6,245 0.98 Jersey City
95 El Paso County Colorado 5,508.39 2,126.80 622,263 113 293 627,159 114 295 636,963 116 299 9,804 1.56 Colorado Springs
96 Davidson County Tennessee 1,305.44 504.03 626,681 480 1,243 628,053 481 1,246 635,475 487 1,261 7,422 1.18 Nashville
97 Lee County Florida 2,031.88 784.51 618,754 305 789 620,450 305 791 631,330 311 805 10,880 1.75 Fort Myers
98 Monmouth County New Jersey 1,214.17 468.79 630,380 519 1,345 630,920 520 1,346 631,020 520 1,346 100 0.02 Freehold
99 Bucks County Pennsylvania 1,565.15 604.31 625,249 399 1,035 625,618 400 1,035 626,854 401 1,037 1,236 0.20 Doylestown
100 Providence County Rhode Island 1,060.60 409.50 626,667 591 1,530 626,797 591 1,531 626,709 591 1,530 -88 -0.01 Providence
Rank County State Land
area
(km²)[4]		 Land
area
(mi²)[5]		 April 1,
2010
census
[6]		 April 1,
2010
density
(/km²)		 April 1,
2010
density
(/mi²)		 July 1,
2010
official
estimate
[7]		 July 1,
2010
density
(/km²)		 July 1,
2010
density
(/mi²)		 July 1,
2011
official
estimate
[7]		 July 1,
2011
density
(/km²)		 July 1,
2011
density
(/mi²)		 Mid-2010
to
mid-2011
change
(Absolute)		 Mid-2010
to
mid-2011
change
(%)		 County seat
or courthouse

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 GeoHive - the United States of America - US States and Counties (Attached Excel spreadsheet)
  5. ↑ 5.0 5.1 The area in square kilometers of the column to the left divided by 2.589988110336 (1.609344²).
  6. ↑ 6.0 6.1 United States Census Bureau, Table: Population change for counties
  7. ↑ 7.0 7.1 United States Census Bureau (USCB), Resident Population Estimates for the 100 Largest U.S. Counties Based on July 1, 2011 Population Estimates: April 1, 2010 to July 1, 2011
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