Out of 3,142 counties and county equivalents, 1,610 (51.2%) gained population between 2018 and 2019. Nine counties (0.3%) experienced no change in population during this time, while the remaining 1,523 (48.5%) lost population. Between 2010 and 2019, 1,459 (46.4%) counties gained population, and 1,683 (53.6%) lost population. |
TOP 10 MOST
POPULOUS COUNTIES, 2019
|
|||||
Rank
|
State
|
County
|
April 1, 2010
(Estimates Base)
|
July 1, 2018
|
July 1, 2019
|
1
|
California | Los Angeles |
9,819,968
|
10,073,906
|
10,039,107
|
2
|
Illinois | Cook |
5,195,026
|
5,171,960
|
5,150,233
|
3
|
Texas | Harris |
4,093,176
|
4,680,045
|
4,713,325
|
4
|
Arizona | Maricopa |
3,817,365
|
4,402,403
|
4,485,414
|
5
|
California | San Diego |
3,095,349
|
3,333,861
|
3,338,330
|
6
|
California | Orange |
3,008,989
|
3,175,973
|
3,175,692
|
7
|
Florida | Miami-Dade |
2,497,993
|
2,714,854
|
2,716,940
|
8
|
Texas | Dallas |
2,367,430
|
2,629,350
|
2,635,516
|
9
|
New York | Kings |
2,504,721
|
2,578,074
|
2,559,903
|
10
|
California | Riverside |
2,445,789
|
2,445,789
|
2,470,546
|
TOP 10 COUNTIES IN NUMERIC GROWTH
2010 T0 2019
|
|||||
Rank
|
State
|
County
|
April 1, 2010
(Estimates Base)
|
July 1, 2018
|
July 1, 2019
|
1
|
Arizona | Maricopa |
3,817,365
|
4,402,403
|
688,049
|
2
|
Texas | Harris |
4,093,176
|
4,680,045
|
620,149
|
3
|
Washington | King |
1,931,287
|
2,228,364
|
321,495
|
4
|
Nevada | Clark |
1,951,268
|
2,226,115
|
315,447
|
5
|
Texas | Tarrant |
1,810,664
|
2,081,446
|
291,851
|
6
|
Texas | Bexar |
1,714,781
|
1,981,187
|
288,773
|
7
|
California | Riverside |
2,189,765
|
2,445,789
|
280,781
|
8
|
Texas | Dallas |
2,367,430
|
2,629,350
|
268,086
|
9
|
Texas | Collin |
781,419
|
1,004,307
|
263,311
|
10
|
Texas | Travis |
1,024,444
|
1,246,572
|
249,510
|
TOP 10 COUNTIES IN PERCENTAGE GROWTH
2010 T0 2019
|
||||||
Rank
|
State
|
County
|
April 1, 2010
(Estimates Base)
|
July 1, 2018
|
July 1, 2019
|
Percent
Growth
|
1
|
North Dakota | Williams |
22,399
|
35,469
|
37,589
|
67.8
|
2
|
Texas | Hays |
157,103
|
222,706
|
230,191
|
46.5
|
3
|
Utah | Wasatch |
23,525
|
33,067
|
34,091
|
44.9
|
4
|
Texas | Comal |
108,520
|
148,141
|
156,209
|
43.9
|
5
|
Texas | Kendall |
33,384
|
45,603
|
47,431
|
42.1
|
6
|
Florida | Sumter |
93,420
|
128,719
|
132,420
|
41.7
|
7
|
Iowa | Dallas |
66,139
|
89,953
|
93,453
|
41.3
|
8
|
Florida | Osceola |
268,685
|
368,456
|
375,751
|
39.8
|
9
|
Texas | Williamson |
422,504
|
566,463
|
590,551
|
39.8
|
10
|
Florida | St. Johns |
190,038
|
253,814
|
264,672
|
39.3
|
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