Rang
County
Bundesstaat
County Seat
Einwohner
Größe [km²]
1
Los Angeles County
USA-Kalifornien Kalifornien
Los Angeles
10.163.507
12.308
2
Cook County
USA-Illinois Illinois
Chicago
5.211.263
4.235
3
Harris County
USA-Texas Texas
Houston
4.652.980
4.604
4
Maricopa County
USA-Arizona Arizona
Phoenix
4.307.033
23.891
5
San Diego County
USA-Kalifornien Kalifornien
San Diego
3.337.685
11.721
6
Orange County
USA-Kalifornien Kalifornien
Santa Ana
3.190.400
2.455
7
Miami-Dade County
USA-Florida Florida
Miami
2.751.796
6.297
8
Kings County
USA-New York New York
keiner
2.648.771
251
9
Dallas County
USA-Texas Texas
Dallas
2.618.148
2.353
10
Riverside County
USA-Kalifornien Kalifornien
Riverside
2.423.266
18.915
11
Queens County
USA-New York New York
keiner
2.358.582
462
12
Clark County
USA-Nevada Nevada
Las Vegas
2.204.079
20.955
13
King County
USA-Washington Washington
Seattle
2.188.649
5.974
14
San Bernardino County
USA-Kalifornien Kalifornien
San Bernardino
2.157.404
52.073
15
Tarrant County
USA-Texas Texas
Fort Worth
2.054.475
2.324
16
Bexar County
USA-Texas Texas
San Antonio
1.958.578
3.255
17
Santa Clara County
USA-Kalifornien Kalifornien
San José
1.938.153
3.377
18
Broward County
USA-Florida Florida
Fort Lauderdale
1.935.878
3.418
19
Wayne County
USA-Michigan Michigan
Detroit
1.753.616
1.741
20
Manhattan County
USA-New York New York
keiner
1.664.727
88
21
Alameda County
USA-Kalifornien Kalifornien
Oakland
1.663.190
2.127
22
Middlesex County
USA-Massachusetts Massachusetts
Cambridge und Lowell
1.602.947
2.195
23
Philadelphia County
USA-Pennsylvania Pennsylvania
Philadelphia
1.580.863
369
24
Sacramento County
USA-Kalifornien Kalifornien
Sacramento
1.530.615
2.578
25
Suffolk County
USA-New York New York
Riverhead
1.492.953
6.146
26
Bronx County
USA-New York New York
keiner
1.471.160
149
27
Palm Beach County
USA-Florida Florida
West Palm Beach
1.471.150
6.181
28
Hillsborough County
USA-Florida Florida
Tampa
1.408.566
3.279
29
Nassau County
USA-New York New York
Mineola
1.369.514
1.173
30
Orange County
USA-Florida Florida
Orlando
1.348.975
2.601
31
Franklin County
USA-Ohio Ohio
Columbus
1.291.981
1.408
32
Hennepin County
USA-Minnesota Minnesota
Minneapolis
1.252.024
1.571
33
Oakland County
USA-Michigan Michigan
Pontiac
1.250.836
2.532
34
Cuyahoga County
USA-Ohio Ohio
Cleveland
1.248.514
3.226
35
Travis County
USA-Texas Texas
Austin
1.226.698
2.650
36
Allegheny County
USA-Pennsylvania Pennsylvania
Pittsburgh
1.223.048
1.929
37
Contra Costa County
USA-Kalifornien Kalifornien
Martinez
1.147.439
2.078
38
Fairfax County
USA-Virginia Virginia
Fairfax
1.148.433
1.053
39
Salt Lake County
USA-Utah Utah
Salt Lake City
1.135.649
2.092
40
Mecklenburg County
USA-North Carolina North Carolina
Charlotte
1.076.837
1.415
41
Wake County
USA-North Carolina North Carolina
Raleigh
1.072.203
2.220
42
Montgomery County
USA-Maryland Maryland
Rockville
1.058.810
1.313
43
Fulton County
USA-Georgia Georgia
Atlanta
1.041.423
1.385
44
Pima County
USA-Arizona Arizona
Tucson
1.022.769
23.799
45
St. Louis County
USA-Missouri Missouri
Clayton
996.726
1.356
46
Fresno County
USA-Kalifornien Kalifornien
Fresno
989.255
15.585
47
Honolulu City and County
USA-Hawaii Hawaii
Honolulu
988.650
5.509
48
Westchester County
USA-New York New York
White Plains
980.244
1.295
49
Pinellas County
USA-Florida Florida
Clearwater
970.637
1.574
50
Collin County
USA-Texas Texas
McKinney
969.603
2.294
51
Milwaukee County
USA-Wisconsin Wisconsin
Milwaukee
952.085
3.081
52
Marion County
USA-Indiana Indiana
Indianapolis
950.082
1.044
53
Fairfield County
USA-Connecticut Connecticut
keiner
949.921
2.168
54
Bergen County
USA-New Jersey New Jersey
Hackensack
948.406
639
55
Duval County
USA-Florida Florida
Jacksonville
937.934
2.378
56
Shelby County
USA-Tennessee Tennessee
Memphis
936.961
2.030
57
DuPage County
USA-Illinois Illinois
Wheaton
930.128
872
58
Erie County
USA-New York New York
Buffalo
925.528
3.178
59
Gwinnett County
USA-Georgia Georgia
Lawrenceville
920.260
1.131
60
Prince George’s County
USA-Maryland Maryland
Upper Marlboro
912.756
1.291
61
Hartford County
USA-Connecticut Connecticut
keiner
895.388
1.944
62
Kern County
USA-Kalifornien Kalifornien
Bakersfield
893.119
21.138
63
San Francisco County
USA-Kalifornien Kalifornien
San Francisco
884.363
121
64
Pierce County
USA-Washington Washington
Tacoma
876.764
4.679
65
Macomb County
USA-Michigan Michigan
Mount Clemens
871.375
1.476
66
Hidalgo County
USA-Texas Texas
Edinburg
860.661
4.099
67
New Haven County
USA-Connecticut Connecticut
keiner
860.435
2.233
68
Ventura County
USA-Kalifornien Kalifornien
Ventura
854.223
5.719
69
Middlesex County
USA-New Jersey New Jersey
New Brunswick
842.798
835
70
El Paso County
USA-Texas Texas
El Paso
840.410
2.628
71
Denton County
USA-Texas Texas
Denton
836.210
2.481
72
Baltimore County
USA-Maryland Maryland
Towson
832.468
1.766
73
Worcester County
USA-Massachusetts Massachusetts
Worcester
826.116
4.090
74
Montgomery County
USA-Pennsylvania Pennsylvania
Norristown
826.075
1.262
75
Hamilton County
USA-Ohio Ohio
Cincinnati
813.822
1.069
76
Essex County
USA-New Jersey New Jersey
Newark
808.285
336
77
Multnomah County
USA-Oregon Oregon
Portland
807.555
1.206
78
Snohomish County
USA-Washington Washington
Everett
801.633
5.689
79
Suffolk County
USA-Massachusetts Massachusetts
Boston
797.939
311
80
Oklahoma County
USA-Oklahoma Oklahoma
Oklahoma City
787.958
1.860
81
Essex County
USA-Massachusetts Massachusetts
Salem und Lawrence
785.205
2.146
82
San Mateo County
USA-Kalifornien Kalifornien
Redwood City
771.410
1.919
83
Jefferson County
USA-Kentucky Kentucky
Louisville
771.158
1.032
84
Fort Bend County
USA-Texas Texas
Richmond
764.828
2.265
85
Cobb County
USA-Georgia Georgia
Marietta
755.754
881
86
DeKalb County
USA-Georgia Georgia
Decatur
753.253
702
87
Monroe County
USA-New York New York
Rochester
747.642
3.537
88
San Joaquin County
USA-Kalifornien Kalifornien
Stockton
745.424
3.694
89
Lee County
USA-Florida Florida
Fort Myers
739.224
3.139
90
Denver County
USA-Colorado Colorado
Denver
704.621
401
91
Lake County
USA-Illinois Illinois
Waukegan
703.520
3.543
92
Norfolk County
USA-Massachusetts Massachusetts
Dedham
700.322
1.150
93
El Paso County
USA-Colorado Colorado
Colorado Springs
699.232
5.516
94
Jackson County
USA-Missouri Missouri
Kansas City undIndependence
698.895
1.596
95
Will County
USA-Illinois Illinois
Joliet
692.661
2.200
96
Hudson County
USA-New Jersey New Jersey
Jersey City
691.643
162
97
Davidson County
USA-Tennessee Tennessee
Nashville
691.243
1.363
98
Polk County
USA-Florida Florida
Bartow
686.483
5.206
99
Bernalillo County
USA-New Mexico New Mexico
Albuquerque
676.773
3.027
100
Jefferson County
USA-Alabama Alabama
Birmingham
659.197
2.911