U.S. Population – County Population

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Rank County 2010 Census 2000 Census Growth (%)
Los Angeles County, CA 9,880,569 9,519,338 3.8
Cook County, IL 5,310,767 5,376,741 -1.2
Harris County, TX 4,147,218 3,400,578 22.0
Maricopa County, AZ 4,063,802 3,072,149 32.3
Orange County, CA 3,058,905 2,846,289 7.5
San Diego County, CA 3,076,745 2,813,833 9.3
Kings County, NY 2,584,652 2,465,326 4.8
Dallas County, TX 2,493,102 2,218,899 12.4
Miami-Dade County, FL 2,534,220 2,253,362 12.5
10  Queens County, NY 2,319,777 2,229,379 4.1
11  Riverside County, CA 2,176,129 1,545,387 40.8
12  San Bernardino County, CA 2,040,080 1,709,434 19.3
13  Wayne County, MI 1,904,853 2,061,162 -7.6
14  King County, WA 1,948,445 1,737,034 12.2
15  Clark County, NV 1,911,769 1,375,765 39.0
16  Santa Clara County, CA 1,807,547 1,682,585 7.4
17  Broward County, FL 1,788,118 1,623,018 10.2
18  Tarrant County, TX 1,826,770 1,446,219 26.3
19  New York County, NY 1,631,306 1,537,195 6.1
20  Bexar County, TX 1,681,428 1,392,931 20.7
21  Suffolk County, NY 1,521,211 1,419,369 7.2
22  Middlesex County, MA 1,516,942 1,465,396 3.5
23  Alameda County, CA 1,504,411 1,443,741 4.2
24  Philadelphia County, PA 1,558,613 1,517,550 2.7
25  Sacramento County, CA 1,412,333 1,223,499 15.4
26  Bronx County, NY 1,402,250 1,332,650 5.2
27  Nassau County, NY 1,364,745 1,334,544 2.3
28  Cuyahoga County, OH 1,269,455 1,393,978 -8.9
29  Palm Beach County, FL 1,290,971 1,131,184 14.1
30  Allegheny County, PA 1,220,510 1,281,666 -4.8
31  Oakland County, MI 1,207,592 1,194,156 1.1
32  Hillsborough County, FL 1,212,971 998,948 21.4
33  Hennepin County, MN 1,166,986 1,116,200 4.5
34  Franklin County, OH 1,159,947 1,068,978 8.5
35  Orange County, FL 1,100,043 896,344 22.7
36  Contra Costa County, CA 1,055,952 948,816 11.3
37  Salt Lake County, UT 1,052,900 898,387 17.2
38  Fairfax County, VA 1,055,577 969,749 8.9
39  Fulton County, GA 1,054,582 816,006 29.2
40  Pima County, AZ 1,027,226 843,746 21.7
41  Travis County, TX 1,054,052 812,280 29.8
42  St. Louis County, MO 991,974 1,016,315 -2.4
43  Westchester County, NY 961,499 923,459 4.1
44  Milwaukee County, WI 965,303 940,164 2.7
45  Montgomery County, MD 988,521 873,341 13.2
46  DuPage County, IL 941,097 904,161 4.1
47  Pinellas County, FL 909,978 921,482 -1.2
48  Erie County, NY 906,245 950,265 -4.6
49  Fresno County, CA 924,691 799,407 15.7
50  Shelby County, TN 925,852 897,472 3.2
51  Honolulu County, HI 909,151 876,156 3.8
52  Fairfield County, CT 908,263 882,567 2.9
53  Bergen County, NJ 900,766 884,118 1.9
54  Mecklenburg County, NC 928,585 695,454 33.5
55  Marion County, IN 897,380 860,454 4.3
56  Hartford County, CT 881,536 857,183 2.8
57  Wake County, NC 920,122 627,846 46.6
58  Hamilton County, OH 855,340 845,303 1.2
59  Duval County, FL 860,576 778,879 10.5
60  New Haven County, CT 850,587 824,008 3.2
61  Macomb County, MI 831,157 788,149 5.5
62  Prince George's County, MD 839,212 801,515 4.7
63  San Francisco County, CA 816,159 776,733 5.1
64  Kern County, CA 814,852 661,645 23.2
65  Ventura County, CA 810,359 753,197 7.6
66  Gwinnett County, GA 820,869 588,448 39.5
67  Middlesex County, NJ 794,857 750,162 6.0
68  Pierce County, WA 792,919 700,820 13.1
69  Baltimore County, MD 791,637 754,292 5.0
70  Worcester County, MA 808,309 750,963 7.6
71  Montgomery County, PA 789,862 750,097 5.3
72  Essex County, NJ 769,156 793,633 -3.1
73  Collin County, TX 815,101 491,675 65.8
74  El Paso County, TX 762,563 679,622 12.2
75  DeKalb County, GA 752,361 665,865 13.0
76  Essex County, MA 749,560 723,419 3.6
77  Monroe County, NY 733,719 735,343 -0.2
78  Suffolk County, MA 759,925 689,807 10.2
79  Hidalgo County, TX 761,223 569,463 33.7
80  Multnomah County, OR 738,351 660,486 11.8
81  Jefferson County, KY 726,844 693,604 4.8
82  San Mateo County, CA 724,877 707,161 2.5
83  Lake County, IL 714,252 644,356 10.8
84  Oklahoma County, OK 727,010 660,448 10.1
85  Cobb County, GA 719,617 607,751 18.4
86  Snohomish County, WA 709,534 606,024 17.1
87  Will County, IL 688,081 502,266 37.0
88  San Joaquin County, CA 683,494 563,598 21.3
89  Jackson County, MO 710,455 654,880 8.5
90  Norfolk County, MA 672,873 650,308 3.5
91  Jefferson County, AL 665,494 662,047 0.5
92  Monmouth County, NJ 645,583 615,301 4.9
93  Baltimore city, MD 634,725 651,154 -2.5
94  Denton County, TX 675,377 432,976 56.0
95  Bernalillo County, NM 648,641 556,678 16.5
96  Providence County, RI 630,620 621,602 1.5
97  Davidson County, TN 641,870 569,891 12.6
98  Bucks County, PA 626,280 597,635 4.8
99  Denver County, CO 626,876 554,636 13.0
100  El Paso County, CO 617,908 516,929 19.5
Source: U.S. Census Bureau, Population Division
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