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

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.

Many of the counties on the list include major cities or metropolitan areas. Four of the listed counties have consolidated city and county government, namely the City and County of Honolulu, City and County of Philadelphia, City and County of San Francisco and City and County of Denver.[1][2][3] Baltimore, Maryland, has been an independent city since 1851; however, it is considered to be a county-equivalent by the U.S. Census Bureau, and therefore is included in the list in the 100th position, together with the Baltimore County (which according to the 2010 census is in the 67th place).

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. 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 2010 census

Downtown Los Angeles, County Seat of the most populous county in the United States, county buildings, bottom right.
Downtown Chicago, in Cook County, Illinois, the second most populous county in the United States.
Downtown Houston, located in Harris County, Texas, the third most populous county in the United States
Downtown Phoenix, Arizona, county seat of the fourth most populous county in the United States, Maricopa County, Arizona.
Downtown San Diego, California, The fifth most populous county in the United States
Aerial view of Orange County, California, the 6th most populous county in the United States.
Row houses in Brooklyn, Kings County, New York, the 7th most populous county in the United States.
Downtown Miami in Miami-Dade County, the largest county in Florida, and the county seat of the 8th most populous county in the United States.
Seattle seat of King County, Washington, King County ranks as the 14th most populous county in the United States.
The Guardian Building in Detroit, headquarters of Michigan's Wayne County, 15th most populous county in the United States.
Rank County State Land
area
(km²)[4]
 Land
area
(mi²)
[5]		 April 1,
2000
census
[6]		 2000
density
(/km²)		 2000
density
(/mi²)		 April 1,
2010
census
[6]		 2010
density
(/km²)		 2010
density
(/mi²)		 Absolute
decennial
change		 Decennial
change
(%)		 Average
annual
change
(%)		 County seat
or courthouse
1 Los Angeles County California 10,517.61 4,060.87 9,519,338 905 2,344 9,818,605 934 2,418 299,267 3.14 0.31 Los Angeles
2 Cook County Illinois 2,449.30 945.68 5,376,741 2,195 5,686 5,194,675 2,121 5,493 -182,066 -3.39 -0.34 Chicago
3 Harris County Texas 4,477.65 1,728.83 3,400,578 759 1,967 4,092,459 914 2,367 691,881 20.35 1.87 Houston
4 Maricopa County Arizona 23,836.02 9,203.14 3,072,149 129 334 3,817,117 160 415 744,968 24.25 2.19 Phoenix
5 San Diego County California 10,877.67 4,199.89 2,813,833 259 670 3,095,313 285 737 281,480 10.00 0.96 San Diego
6 Orange County California 2,044.54 789.40 2,846,289 1,392 3,606 3,010,232 1,472 3,813 163,943 5.76 0.56 Santa Ana
7 Kings County New York 182.88 70.61 2,465,326 13,481 34,915 2,504,700 13,696 35,472 39,374 1.60 0.16 Brooklyn
8 Miami-Dade County Florida 5,040.27 1,946.06 2,253,362 447 1,158 2,496,435 495 1,283 243,073 10.79 1.03 Miami
9 Dallas County Texas 2,278.15 879.60 2,218,899 974 2,523 2,368,139 1,040 2,692 149,240 6.73 0.65 Dallas
10 Queens County New York 282.93 109.24 2,229,379 7,880 20,408 2,230,722 7,884 20,420 1,343 0.06 0.01 Kew Gardens, Queens
11 Riverside County California 18,667.00 7,207.37 1,545,387 83 214 2,189,641 117 304 644,254 41.69 3.55 Riverside
12 San Bernardino County California 51,935.74 20,052.50 1,709,434 33 85 2,035,210 39 101 325,776 19.06 1.76 San Bernardino
13 Clark County Nevada 20,487.69 7,910.34 1,375,765 67 174 1,951,269 95 247 575,504 41.83 3.56 Las Vegas
14 King County Washington 5,506.42 2,126.04 1,737,034 315 817 1,931,249 351 908 194,215 11.18 1.07 Seattle
15 Wayne County Michigan 1,590.64 614.15 2,061,162 1,296 3,356 1,820,584 1,145 2,964 -240,578 -11.67 -1.23 Detroit
16 Tarrant County Texas 2,236.25 863.42 1,446,219 647 1,675 1,809,034 809 2,095 362,815 25.09 2.26 Fort Worth
17 Santa Clara County California 3,342.87 1,290.69 1,682,585 503 1,304 1,781,642 533 1,380 99,057 5.89 0.57 San Jose
18 Broward County Florida 3,121.97 1,205.40 1,623,018 520 1,346 1,748,066 560 1,450 125,048 7.70 0.74 Fort Lauderdale
19 Bexar County Texas 3,229.25 1,246.82 1,392,931 431 1,117 1,714,773 531 1,375 321,842 23.11 2.10 San Antonio
20 New York County New York 59.47 22.96 1,537,195 25,848 66,951 1,585,873 26,667 69,071 48,678 3.17 0.31 Manhattan
21 Philadelphia County Pennsylvania 349.88 135.09 1,517,550 4,337 11,234 1,526,006 4,362 11,296 8,456 0.56 0.06 Philadelphia
22 Alameda County California 1,910.30 737.57 1,443,741 756 1,957 1,510,271 791 2,048 66,530 4.61 0.45 Oakland
23 Middlesex County Massachusetts 2,132.75 823.46 1,465,396 687 1,780 1,503,085 705 1,825 37,689 2.57 0.25 Cambridge and Lowell
24 Suffolk County New York 2,362.59 912.20 1,419,369 601 1,556 1,493,350 632 1,637 73,981 5.21 0.51 Riverhead
25 Sacramento County California 2,501.02 965.65 1,223,499 489 1,267 1,418,788 567 1,469 195,289 15.96 1.49 Sacramento
26 Bronx County New York 108.86 42.03 1,332,650 12,242 31,707 1,385,108 12,724 32,955 52,458 3.94 0.39 The Bronx
27 Nassau County New York 742.52 286.69 1,334,544 1,797 4,655 1,339,532 1,804 4,672 4,988 0.37 0.04 Mineola
28 Palm Beach County Florida 5,112.92 1,974.11 1,131,184 221 573 1,320,134 258 669 188,950 16.70 1.56 West Palm Beach
29 Cuyahoga County Ohio 1,187.48 458.49 1,393,978 1,174 3,040 1,280,122 1,078 2,792 -113,856 -8.17 -0.85 Cleveland
30 Hillsborough County Florida 2,721.84 1,050.91 998,948 367 951 1,229,226 452 1,170 230,278 23.05 2.10 Tampa
31 Allegheny County Pennsylvania 1,891.13 730.17 1,281,666 678 1,755 1,223,348 647 1,675 -58,318 -4.55 -0.46 Pittsburgh
32 Oakland County Michigan 2,259.79 872.51 1,194,156 528 1,369 1,202,362 532 1,378 8,206 0.69 0.07 Pontiac
33 Franklin County Ohio 1,398.26 539.87 1,068,978 765 1,980 1,163,414 832 2,155 94,436 8.83 0.85 Columbus
34 Hennepin County Minnesota 1,441.64 556.62 1,116,200 774 2,005 1,152,425 799 2,070 36,225 3.25 0.32 Minneapolis
35 Orange County Florida 2,350.29 907.45 896,344 381 988 1,145,956 488 1,263 249,612 27.85 2.49 Orlando
36 Fairfax County Virginia 1,023.15 395.04 969,749 948 2,455 1,081,726 1,057 2,738 111,977 11.55 1.10 Fairfax
37 Contra Costa County California 1,864.66 719.95 948,816 509 1,318 1,049,025 563 1,457 100,209 10.56 1.01 Martinez
38 Salt Lake County Utah 1,909.81 737.38 898,387 470 1,218 1,029,655 539 1,396 131,268 14.61 1.37 Salt Lake City
39 Travis County Texas 2,562.28 989.30 812,280 317 821 1,024,266 400 1,035 211,986 26.10 2.35 Austin
40 St. Louis County Missouri 1,315.22 507.81 1,016,315 773 2,001 998,954 760 1,967 -17,361 -1.71 -0.17 Clayton
41 Pima County Arizona 23,792.33 9,186.27 843,746 35 92 980,263 41 107 136,517 16.18 1.51 Tucson
42 Montgomery County Maryland 1,283.39 495.52 873,341 680 1,762 971,777 757 1,961 98,436 11.27 1.07 Rockville
43 Honolulu County Hawaii 1,553.40 599.77 876,156 564 1,461 953,207 614 1,589 77,051 8.79 0.85 Honolulu
44 Westchester County New York 1,121.00 432.82 923,459 824 2,134 949,113 847 2,193 25,654 2.78 0.27 White Plains
45 Milwaukee County Wisconsin 625.64 241.56 940,164 1,503 3,892 947,735 1,515 3,923 7,571 0.81 0.08 Milwaukee
46 Fresno County California 15,443.40 5,962.73 799,407 52 134 930,450 60 156 131,043 16.39 1.53 Fresno
47 Shelby County Tennessee 1,954.22 754.53 897,472 459 1,189 927,644 475 1,229 30,172 3.36 0.33 Memphis
48 Fulton County Georgia 1,369.22 528.66 816,006 596 1,544 920,581 672 1,741 104,575 12.82 1.21 Atlanta
49 Mecklenburg County North Carolina 1,363.06 526.28 695,454 510 1,321 919,628 675 1,747 224,174 32.23 2.83 Charlotte
50 Erie County New York 2,704.49 1,044.21 950,265 351 910 919,040 340 880 -31,225 -3.29 -0.33 Buffalo
51 DuPage County Illinois 864.05 333.61 904,161 1,046 2,710 916,924 1,061 2,748 12,763 1.41 0.14 Wheaton
52 Fairfield County Connecticut 1,620.82 625.80 882,567 545 1,410 916,829 566 1,465 34,262 3.88 0.38 Bridgeport
53 Pinellas County Florida 724.99 279.92 921,482 1,271 3,292 916,542 1,264 3,274 -4,940 -0.54 -0.05 Clearwater
54 Bergen County New Jersey 606.50 234.17 884,118 1,458 3,776 905,116 1,492 3,865 20,998 2.38 0.24 Hackensack
55 Marion County Indiana 1,026.28 396.25 860,454 838 2,171 903,393 880 2,280 42,939 4.99 0.49 Indianapolis
56 Wake County North Carolina 2,154.66 831.92 627,846 291 755 900,993 418 1,083 273,147 43.51 3.68 Raleigh
57 Hartford County Connecticut 1,904.78 735.44 857,183 450 1,166 894,014 469 1,216 36,831 4.30 0.42 Hartford
58 Duval County Florida 2,003.80 773.67 778,879 389 1,007 864,263 431 1,117 85,384 10.96 1.05 Jacksonville
59 Prince George's County Maryland 1,257.26 485.43 801,515 638 1,651 863,420 687 1,779 61,905 7.72 0.75 Upper Marlboro
60 New Haven County Connecticut 1,568.60 605.64 824,008 525 1,361 862,477 550 1,424 38,469 4.67 0.46 New Haven
61 Macomb County Michigan 1,244.33 480.44 788,149 633 1,640 840,978 676 1,750 52,829 6.70 0.65 Mount Clemens
62 Kern County California 21,084.99 8,140.96 661,645 31 81 839,631 40 103 177,986 26.90 2.41 Bakersfield
63 Ventura County California 4,779.31 1,845.30 753,197 158 408 823,318 172 446 70,121 9.31 0.89 Ventura
64 Middlesex County New Jersey 802.17 309.72 750,162 935 2,422 809,858 1,010 2,615 59,696 7.96 0.77 New Brunswick
65 Gwinnett County Georgia 1,120.77 432.73 588,448 525 1,360 805,321 719 1,861 216,873 36.86 3.19 Lawrenceville
66 San Francisco County California 120.93 46.69 776,733 6,423 16,636 805,235 6,659 17,246 28,502 3.67 0.36 San Francisco
67 Baltimore County Maryland 1,550.34 598.59 754,292 487 1,260 805,029 519 1,345 50,737 6.73 0.65 Towson
68 Hamilton County Ohio 1,055.06 407.36 845,303 801 2,075 802,374 761 1,970 -42,929 -5.08 -0.52 Cincinnati
69 El Paso County Texas 2,623.94 1,013.11 679,622 259 671 800,647 305 790 121,025 17.81 1.65 El Paso
70 Montgomery County Pennsylvania 1,251.28 483.12 750,097 599 1,553 799,874 639 1,656 49,777 6.64 0.64 Norristown
71 Worcester County Massachusetts 3,918.81 1,513.06 750,963 192 496 798,552 204 528 47,589 6.34 0.62 Worcester
72 Pierce County Washington 4,348.36 1,678.91 700,820 161 417 795,225 183 474 94,405 13.47 1.27 Tacoma
73 Essex County New Jersey 327.04 126.27 793,633 2,427 6,285 783,969 2,397 6,209 -9,664 -1.22 -0.12 Newark
74 Collin County Texas 2,195.17 847.56 491,675 224 580 782,341 356 923 290,666 59.12 4.75 McKinney
75 Hidalgo County Texas 4,065.63 1,569.75 569,463 140 363 774,769 191 494 205,306 36.05 3.13 Edinburg
76 Monroe County New York 1,707.55 659.29 735,343 431 1,115 744,344 436 1,129 9,001 1.22 0.12 Rochester
77 Essex County Massachusetts 1,296.73 500.67 723,419 558 1,445 743,159 573 1,484 19,740 2.73 0.27 Salem and Lawrence
78 Jefferson County Kentucky 997.38 385.09 693,604 695 1,801 741,096 743 1,924 47,492 6.85 0.66 Louisville
79 Multnomah County Oregon 1,127.24 435.23 660,486 586 1,518 735,334 652 1,690 74,848 11.33 1.08 Portland
80 Suffolk County Massachusetts 151.57 58.52 689,807 4,551 11,788 722,023 4,764 12,338 32,216 4.67 0.46 Boston
81 Oklahoma County Oklahoma 1,836.54 709.09 660,448 360 931 718,633 391 1,013 58,185 8.81 0.85 Oklahoma City
82 San Mateo County California 1,163.09 449.07 707,161 608 1,575 718,451 618 1,600 11,290 1.60 0.16 Redwood City
83 Snohomish County Washington 5,410.64 2,089.06 606,024 112 290 713,335 132 341 107,311 17.71 1.64 Everett
84 Lake County Illinois 1,159.18 447.56 644,356 556 1,440 703,462 607 1,572 59,106 9.17 0.88 Waukegan
85 DeKalb County Georgia 694.66 268.21 665,865 959 2,483 691,893 996 2,580 26,028 3.91 0.38 Decatur
86 Cobb County Georgia 880.98 340.15 607,751 690 1,787 688,078 781 2,023 80,327 13.22 1.25 Marietta
87 San Joaquin County California 3,624.12 1,399.28 563,598 156 403 685,306 189 490 121,708 21.59 1.97 Stockton
88 Will County Illinois 2,167.67 836.94 502,266 232 600 677,560 313 810 175,294 34.90 3.04 Joliet
89 Jackson County Missouri 1,566.53 604.84 654,880 418 1,083 674,158 430 1,115 19,278 2.94 0.29 Independence
90 Norfolk County Massachusetts 1,034.91 399.58 650,308 628 1,627 670,850 648 1,679 20,542 3.16 0.31 Dedham
91 Denton County Texas 2,301.31 888.54 432,976 188 487 662,614 288 746 229,638 53.04 4.35 Denton
92 Bernalillo County New Mexico 3,020.00 1,166.03 556,678 184 477 662,564 219 568 105,886 19.02 1.76 Albuquerque
93 Jefferson County Alabama 2,881.65 1,112.61 662,047 230 595 658,466 229 592 -3,581 -0.54 -0.05 Birmingham
94 Hudson County New Jersey 120.93 46.69 608,975 5,036 13,043 634,266 5,245 13,585 25,291 4.15 0.41 Jersey City
95 Monmouth County New Jersey 1,222.32 471.94 615,301 503 1,304 630,380 516 1,336 15,079 2.45 0.24 Freehold Borough
96 Davidson County Tennessee 1,300.85 502.26 569,891 438 1,135 626,681 482 1,248 56,790 9.97 0.95 Nashville
97 Providence County Rhode Island 1,070.36 413.27 621,602 581 1,504 626,667 585 1,516 5,065 0.81 0.08 Providence
98 Bucks County Pennsylvania 1,573.11 607.38 597,635 380 984 625,249 397 1,029 27,614 4.62 0.45 Doylestown
99 El Paso County Colorado 5,507.48 2,126.45 516,929 94 243 622,263 113 293 105,334 20.38 1.87 Colorado Springs
100 Baltimore City Maryland 209.27 80.80 651,154 3,112 8,059 620,961 2,967 7,685 -30,193 -4.64 -0.47 Baltimore
Rank County State Land
area
(km²)		 Land
area
(mi²)		 April 1,
2000
census		 2000
density
(/km²)		 2000
density
(/mi²)		 April 1,
2010
census		 2010
density
(/km²)		 2010
density
(/mi²)		 Absolute
decennial
change		 Decennial
change
(%)		 Average
annual
change
(%)		 County seat
or courthouse

References

  1. ^ "This Is Your City and County of Honolulu Government". City and County of Honolulu. Retrieved 2008-01-23.
  2. ^ "City and County Organizational Chart". City and County of San Francisco. Retrieved 2008-01-23.
  3. ^ "Active Colorado Municipalities as of January 26, 2010". Colorado Department of Local Affairs. Retrieved 2010-01-26.
  4. ^ Area in square miles supplied by the U.S. Census Bureau multiplied by 2.589988110336 (1.609344²).
  5. ^ U.S. Census Bureau, American Factfinder, United States - County by State, and for Puerto Rico. Population, Housing Units, Area, and Density: 2000
  6. ^ a b United States Census Bureau, Table: Population change for counties

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