The following is a sortable table of the most populous county in each U.S. state and territory . Counties in bold have a population of at least 1 million.
Table
State
Largest county/parish/municipality
Population (2013 estimate)
County/parish seat or shire town
State Population (2013 estimate) [1]
Largest County Percentage of State Population
Alabama
Jefferson
659,479
Birmingham
4,833,722
13.64%
Alaska
Anchorage
300,950
Anchorage
735,132
40.94%
Arizona
Maricopa
4,009,412
Phoenix
6,626,624
60.50%
Arkansas
Pulaski
391,284
Little Rock
2,959,373
13.22%
California
Los Angeles
10,017,068
Los Angeles
38,332,521
26.13%
Colorado
El Paso
655,044
Colorado Springs
5,268,367
12.43%
Connecticut
Fairfield
939,904
Bridgeport
3,596,080
26.14%
Delaware
New Castle
549,684
Wilmington
925,749
59.38%
Florida
Miami-Dade
2,617,176
Miami
19,552,860
13.39%
Georgia
Fulton
1,010,562
Atlanta
10,214,860
09.85%
Hawaii
Honolulu
983,429
Honolulu
1,404,054
70.04%
Idaho
Ada
416,464
Boise
1,612,136
25.83%
Illinois
Cook
5,240,700
Chicago
12,882,135
40.68%
Indiana
Marion
928,281
Indianapolis
6,570,902
14.13%
Iowa
Polk
451,677
Des Moines
3,090,416
14.62%
Kansas
Johnson
566,933
Olathe
2,893,957
19.59%
Kentucky
Jefferson
756,832
Louisville
4,395,295
17.22%
Louisiana
East Baton Rouge
445,227
Baton Rouge
4,625,470
09.63%
Maine
Cumberland
285,456
Portland
1,328,302
21.49%
Maryland
Montgomery
1,016,677
Rockville
5,928,814
17.15%
Massachusetts
Middlesex
1,552,802
Cambridge and Lowell
6,692,824
23.20%
Michigan
Wayne
1,775,273
Detroit
9,895,622
17.94%
Minnesota
Hennepin
1,198,778
Minneapolis
5,420,380
22.12%
Mississippi
Hinds
244,899
Jackson
2,991,207
08.19%
Missouri
St. Louis County
1,001,444
Clayton
6,044,171
16.57%
Montana
Yellowstone
154,162
Billings
1,015,165
15.19%
Nebraska
Douglas
531,265
Omaha
1,868,516
28.43%
Nevada
Clark
2,027,868
Las Vegas
2,790,136
72.68%
New Hampshire
Hillsborough
402,922
Manchester and Nashua
1,323,459
30.44%
New Jersey
Bergen
925,328
Hackensack
8,899,339
10.40%
New Mexico
Bernalillo
673,460
Albuquerque
2,085,287
32.30%
New York
Kings
2,592,149
Brooklyn
19,651,127
13.19%
North Carolina
Mecklenburg
990,977
Charlotte
9,848,060
10.06%
North Dakota
Cass
162,829
Fargo
723,393
22.51%
Ohio
Cuyahoga
1,268,154
Cleveland
11,570,808
10.96%
Oklahoma
Oklahoma
755,245
Oklahoma City
3,850,568
19.61%
Oregon
Multnomah
759,256
Portland
3,930,065
19.32%
Pennsylvania
Philadelphia
1,553,165
Philadelphia
12,773,801
12.16%
Rhode Island
Providence
628,323
Providence
1,051,511
59.75%
South Carolina
Greenville
474,266
Greenville
4,774,839
09.93%
South Dakota
Minnehaha
179,640
Sioux Falls
844,877
21.26%
Tennessee
Shelby
940,764
Memphis
6,495,978
14.48%
Texas
Harris
4,336,853
Houston
26,448,193
16.40%
Utah
Salt Lake
1,063,842
Salt Lake City
2,900,872
36.67%
Vermont
Chittenden
158,504
Burlington
626,630
25.29%
Virginia
Fairfax
1,116,897
Fairfax
8,260,405
13.52%
Washington
King
2,044,449
Seattle
6,971,406
29.33%
West Virginia
Kanawha
191,275
Charleston
1,854,304
10.32%
Wisconsin
Milwaukee
956,023
Milwaukee
5,742,713
16.65%
Wyoming
Laramie
95,809
Cheyenne
582,658
16.44%
References
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See also