Population
|
No. Counties
|
County
|
10,039,107
|
1
|
Los Angeles
|
5,271,545
|
8
|
Orange
|
5,172,966
|
3
|
Cook
|
4,748,561
|
2
|
Harris
|
4,485,414
|
1
|
Maricopa
|
3,807,228
|
18
|
Montgomery
|
3,655,115
|
26
|
Jefferson
|
3,338,330
|
1
|
San Diego
|
3,129,511
|
12
|
Clark
|
2,790,052
|
5
|
Dallas
|
|
Population
|
No. Counties
|
County
|
2,716,940
|
1
|
Miami-Dade
|
2,712,843
|
2
|
Kings
|
2,687,533
|
31
|
Washington
|
2,609,779
|
4
|
Middlesex
|
2,470,546
|
1
|
Riverside
|
2,372,616
|
3
|
Suffolk
|
2,369,490
|
16
|
Wayne
|
2,334,368
|
25
|
Franklin
|
2,253,858
|
1
|
Queens
|
2,253,054
|
2
|
King
|
|