List of the most populous counties in the United States

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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 counties in the United States with a population of more than 100,000 based on the national decennial US census conducted on 1 April 2010 and subsequent mid-2010 and mid-2018 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] New York County, Bronx County, Kings County, Queens County, and Richmond County, are coterminous with the respective boroughs of New York City, and fall under the jurisdiction of the combined city government. Connecticut, Rhode Island, and most of Massachusetts also don't have county governments.

List[edit]

This list lists the most populous US counties sorted according to the mid-2018 official estimate by the United States Census Bureau (USCB).

Rank County State Land
area
(km2)[4]
Land
area
(mi2)[5]
April 1,
2010
census
July 1,
2018
official
estimate
Mid-2010
to
mid-2018
change
(absolute)
Mid-2010
to
mid-2018
change
(%)
County seat
1 Los Angeles California 10,509.87 4,057.88 9,818,605 10,105,518 344,902 3.51 Los Angeles
2 Cook Illinois 2,448.38 945.33 5,194,675 5,180,493 16,588 0.32 Chicago
3 Harris Texas 4,411.99 1,703.48 4,092,459 4,698,619 560,521 13.70 Houston
4 Maricopa Arizona 23,828.26 9,200.14 3,817,117 4,410,824 489,916 12.83 Phoenix
5 San Diego California 10,895.12 4,206.63 3,095,313 3,343,364 242,372 7.83 San Diego
6 Orange California 2,047.56 790.57 3,010,232 3,185,968 180,168 5.99 Santa Ana
7 Miami-Dade Florida 4,915.06 1,897.72 2,496,435 2,761,581 255,361 10.23 Miami
8 Dallas Texas 2,256.60 871.28 2,368,139 2,637,772 250,009 10.56 Dallas
9 Kings New York 183.41 70.82 2,504,700 2,582,830 144,071 5.75 Brooklyn, NYC
10 Riverside California 18,664.70 7,206.48 2,189,641 2,450,758 233,625 10.67 Riverside
11 Queens New York 281.10 108.53 2,230,722 2,278,906 127,860 5.73 Queens, NYC
12 King Washington 5,479.29 2,115.57 1,931,249 2,233,163 257,400 13.33 Seattle
13 Clark Nevada 20,438.71 7,891.43 1,951,269 2,231,647 252,810 12.96 Las Vegas
14 San Bernardino California 51,947.23 20,056.94 2,035,210 2,171,603 122,194 6.00 San Bernardino
15 Tarrant Texas 2,236.74 863.61 1,809,034 2,084,931 245,441 13.57 Fort Worth
16 Bexar Texas 3,211.12 1,239.82 1,714,773 1,986,049 243,805 14.22 San Antonio
17 Broward Florida 3,133.33 1,209.79 1,748,066 1,951,260 243,805 14.22 Fort Lauderdale
18 Santa Clara California 3,341.34 1,290.10 1,781,642 1,937,570 156,511 8.78 San Jose
19 Wayne Michigan 1,585.28 612.08 1,820,584 1,753,893 -66,968 -3.68 Detroit
20 Alameda California 1,914.05 739.02 1,510,271 1,666,753 152,919 10.13 Oakland
21 New York New York 59.13 22.83 1,585,873 1,628,701 78,854 4.97 Manhattan, NYC
22 Middlesex Massachusetts 2,118.14 817.82 1,503,085 1,614,714 99,862 6.64 Lowell and Cambridge
23 Philadelphia Pennsylvania 347.32 134.10 1,526,006 1,584,138 54,857 3.59 Philadelphia
24 Sacramento California 2,498.42 964.64 1,418,788 1,540,975 111,827 7.88 Sacramento
25 Palm Beach Florida 5,101.66 1,969.76 1,320,134 1,485,941 151,016 11.44 West Palm Beach
26 Suffolk New York 2,362.20 912.05 1,493,350 1,481,093 -397 -0.03 Riverhead
27 Hillsborough Florida 2,642.34 1,020.21 1,229,226 1,436,888 179,340 14.59 Tampa
28 Bronx New York 109.03 42.10 1,385,108 1,432,132 86,502 6.21 Bronx, NYC
29 Nassau New York 737.41 284.72 1,339,532 1,358,343 29,982 2.24 Mineola
30 Orange Florida 2,339.87 903.43 1,145,956 1,348,975 203,019 17.72 Orlando
31 Franklin Ohio 1,378.36 532.19 1,163,414 1,310,300 128,567 11.05 Columbus
32 Hennepin Minnesota 1,433.79 553.59 1,152,425 1,259,428 99,599 8.64 Minneapolis
33 Oakland Michigan 2,247.24 867.66 1,202,362 1,259,201 48,474 4.03 Pontiac
34 Travis Texas 2,564.61 990.20 1,024,266 1,248,743 202,432 19.76 Austin
35 Cuyahoga Ohio 1,184.12 457.19 1,280,122 1,243,857 -31,608 -2.47 Cleveland
36 Allegheny Pennsylvania 1,890.88 730.07 1,223,348 1,218,452 -300 -0.02 Pittsburgh
37 Salt Lake Utah 1,922.50 742.28 1,029,655 1,152,633 105,994 10.29 Salt Lake City
38 Fairfax Virginia 1,012.60 390.97 1,081,726 1,150,795 66,707 6.17 Fairfax
39 Contra Costa California 1,854.27 715.94 1,049,025 1,150,215 98,414 9.38 Martinez
40 Mecklenburg North Carolina 1,356.75 523.84 919,628 1,093,901 157,209 17.09 Charlotte
41 Wake North Carolina 2,163.21 835.22 900,993 1,092,305 171,210 19.00 Raleigh
42 Montgomery Maryland 1,272.34 491.25 971,777 1,052,567 87,033 8.96 Rockville
43 Fulton Georgia 1,363.98 526.63 920,581 1,050,114 120,842 13.13 Atlanta
44 Pima Arizona 23,794.31 9,187.04 980,263 1,039,073 42,506 4.34 Tucson
45 Collin Texas 2,178.76 841.22 782,341 1,005,146 187,262 23.94 McKinney
46 St. Louis Missouri 1,315.20 507.80 998,954 996,945 -2,228 -0.22 Clayton
47 Fresno California 15,431.13 5,957.99 930,450 994,400 58,805 6.32 Fresno
48 Honolulu Hawaii 1,555.92 600.74 953,207 980,080 35,443 3.72 Honolulu
49 Pinellas Florida 709.14 273.80 916,542 975,280 54,095 5.90 Clearwater
50 Westchester New York 1,114.98 430.50 949,113 967,612 31,131 3.28 White Plains
51 Marion Indiana 1,026.41 396.30 903,393 954,670 46,689 5.17 Indianapolis
52 Duval Florida 1,974.07 762.19 864,263 950,181 73,761 8.52 Jacksonville
53 Milwaukee Wisconsin 625.23 241.40 947,735 948,201 4,350 0.46 Milwaukee
54 Fairfield Connecticut 1,618.46 624.89 916,829 943,823 33,091 3.61 Bridgeport
55 Bergen New Jersey 603.49 233.01 905,116 936,692 43,290 4.78 Hackensack
56 Shelby Tennessee 1,976.61 763.17 927,644 935,764 9,317 1.00 Memphis
57 DuPage Illinois 848.22 327.50 916,924 928,589 13,204 1.44 Wheaton
58 Gwinnett Georgia 1,114.69 430.38 805,321 927,781 114,939 14.27 Lawrenceville
59 Erie New York 2,700.56 1,042.69 919,040 919,719 6,488 0.71 Buffalo
60 Prince George's Maryland 1,250.16 482.69 863,420 909,308 49,226 5.71 Upper Marlboro
61 Kern California 21,061.57 8,131.92 839,631 896,764 53,488 6.37 Bakersfield
62 Hartford Connecticut 1,903.89 735.10 894,014 892,697 1,374 0.15 Hartford
63 Pierce Washington 4,324.01 1,669.51 795,225 891,299 81,539 10.25 Tacoma
64 San Francisco California 121.40 46.87 805,235 883,305 79,128 9.83 San Francisco
65 Macomb Michigan 1,241.18 479.22 840,978 874,759 30,397 3.61 Mount Clemens
66 Hidalgo Texas 4,068.52 1,570.87 774,769 865,939 85,892 11.09 Edinburg
67 Denton Texas 2,275.13 878.43 662,614 859,064 173,596 26.20 Denton
68 New Haven Connecticut 1,565.66 604.51 862,477 857,620 -2,042 -0.24 New Haven
69 Ventura California 4,773.69 1,843.13 823,318 850,967 30,905 3.75 Ventura
70 El Paso Texas 2,622.86 1,012.69 800,647 840,758 39,763 4.97 El Paso
71 Worcester Massachusetts 3,912.88 1,510.77 798,552 830,839 27,564 3.45 Worcester
72 Middlesex New Jersey 800.08 308.91 809,858 829,685 32,940 4.07 New Brunswick
73 Montgomery Pennsylvania 1,251.07 483.04 799,874 828,604 26,201 3.28 Norristown
74 Baltimore Maryland 1,549.59 598.30 805,029 828,431 27,439 3.41 Towson
75 Hamilton Ohio 1,051.30 405.91 802,374 816,684 11,448 1.43 Cincinnati
76 Snohomish Washington 5,406.01 2,087.27 713,335 814,901 88,298 12.38 Everett
77 Multnomah Oregon 1,117.05 431.30 735,334 811,880 72,221 9.82 Portland
78 Suffolk Massachusetts 150.62 58.15 722,023 807,252 75,916 10.51 Boston
79 Essex New Jersey 326.89 126.21 783,969 799,767 24,316 3.10 Newark
80 Oklahoma Oklahoma 1,835.83 708.82 718,633 792,582 69,325 9.65 Oklahoma City
81 Essex Massachusetts 1,275.73 492.56 743,159 790,638 42,046 5.66 Salem and Lawrence
82 Fort Bend Texas 2,292 885 585,375 787,858 179,453 30.66 Richmond
83 Jefferson Kentucky 985.27 380.42 741,096 770,517 30,062 4.06 Louisville
84 San Mateo California 1,161.37 448.41 718,451 769,545 52,959 7.37 Redwood City
85 Cobb Georgia 879.43 339.55 688,078 756,865 67,676 9.84 Marietta
86 DeKalb Georgia 693.03 267.58 691,893 756,558 61,360 8.87 Decatur
87 Lee Florida 2,031.88 784.51 618,754 754,610 120,470 19.47 Fort Myers
88 San Joaquin California 3,603.51 1,391.32 685,306 752,660 60,118 8.77 Stockton
89 Monroe New York 1,702.15 657.21 744,344 742,474 3,298 0.44 Rochester
90 Denver Colorado 401.36 154.97 600,158 716,492 104,463 17.41 Denver
91 El Paso Colorado 5,508.39 2,126.80 622,263 713,856 76,969 12.37 Colorado Springs
92 Polk Florida 5,208 2,011 602,095 708,009 84,388 14.02 Bartow
93 Norfolk Massachusetts 1,025.91 396.11 670,850 705,388 29,472 4.39 Dedham
94 Washington, D.C. 177.0 68.34 601,723 702,455 92,249 15.33 N/A
95 Lake Illinois 1,149.10 443.67 703,462 700,832 58 0.01 Waukegan
96 Jackson Missouri 1,565.55 604.46 674,158 700,307 24,737 3.67 Independence and Kansas City
97 Davidson Tennessee 1,305.44 504.03 626,681 692,587 64,562 10.30 Nashville
98 Will Illinois 2,167.58 836.91 677,560 692,310 15,101 2.23 Joliet
99 Bernalillo New Mexico 3,006.53 1,160.83 662,564 678,701 14,209 2.14 Albuquerque
100 Hudson New Jersey 119.63 46.19 634,266 676,061 57,377 9.05 Jersey City

Gallery[edit]

References[edit]

  1. ^ "This Is Your City and County of Honolulu Government". City and County of Honolulu. Archived from the original on 2008-01-20. Retrieved 2008-01-23.
  2. ^ "City and County Organizational Chart". City and County of San Francisco. Archived from the original on 2008-02-03. Retrieved 2008-01-23.
  3. ^ "Active Colorado Municipalities as of January 26, 2010". Colorado Department of Local Affairs. Archived from the original on November 23, 2010. Retrieved 2010-01-26.
  4. ^ GeoHive - the United States of America - US States and Counties Archived 2012-04-30 at the Wayback Machine (attached Excel spreadsheet)
  5. ^ The area in square kilometers of the column to the left divided by 2.589988110336 (1.609344²).