List of the 100 largest counties in the United States by population

USA map with county borders

This is a list of the 100 largest counties in the United States by population as of July 2017, the date of the last estimate by the US Census Bureau .

list

rank	county	State	County Seat	Residents	Size [km²]
1	Los Angeles County	California	los Angeles	10.163.507	12.308
2	Cook County	Illinois	Chicago	5,211,263	4,235
3	Harris County	Texas	Houston	4,652,980	4,604
4th	Maricopa County	Arizona	Phoenix	4,307,033	23,891
5	San Diego County	California	San Diego	3,337,685	11,721
6th	Orange County	California	Santa Ana	3,190,400	2,455
7th	Miami-Dade County	Florida	Miami	2,751,796	6,297
8th	Brooklyn County	new York	none	2,648,771	251
9	Dallas County	Texas	Dallas	2,618,148	2,353
10	Riverside County	California	Riverside	2,423,266	18,915
11	Queens County	new York	none	2,358,582	462
12	Clark County	Nevada	Las Vegas	2,204,079	20,955
13	King County	Washington	Seattle	2,188,649	5,974
14th	San Bernardino County	California	San Bernardino	2,157,404	52,073
15th	Tarrant County	Texas	Fort Worth	2,054,475	2,324
16	Bexar County	Texas	San Antonio	1,958,578	3,255
17th	Santa Clara County	California	San Jose	1,938,153	3,377
18th	Broward County	Florida	Fort Lauderdale	1,935,878	3,418
19th	Wayne County	Michigan	Detroit	1,753,616	1,741
20th	Manhattan County	new York	none	1,664,727	88
21st	Alameda County	California	Oakland	1,663,190	2.127
22nd	Middlesex County	Massachusetts	Cambridge and Lowell	1,602,947	2,195
23	Philadelphia County	Pennsylvania	Philadelphia	1,580,863	369
24	Sacramento County	California	Sacramento	1,530,615	2,578
25th	Suffolk County	new York	Riverhead	1,492,953	6,146
26th	Bronx County	new York	none	1,471,160	149
27	Palm Beach County	Florida	West Palm Beach	1,471,150	6.181
28	Hillsborough County	Florida	Tampa	1,408,566	3,279
29	Nassau County	new York	Mineola	1,369,514	1,173
30th	Orange County	Florida	Orlando	1,348,975	2,601
31	Franklin County	Ohio	Columbus	1,291,981	1,408
32	Hennepin County	Minnesota	Minneapolis	1,252,024	1,571
33	Oakland County	Michigan	Pontiac	1,250,836	2,532
34	Cuyahoga County	Ohio	Cleveland	1,248,514	3.226
35	Travis County	Texas	Austin	1,226,698	2,650
36	Allegheny County	Pennsylvania	Pittsburgh	1,223,048	1.929
37	Contra Costa County	California	Martinez	1,147,439	2,078
38	Fairfax County	Virginia	Fairfax	1,148,433	1,053
39	Salt Lake County	Utah	Salt Lake City	1,135,649	2,092
40	Mecklenburg County	North Carolina	Charlotte	1,076,837	1,415
41	Wake County	North Carolina	Raleigh	1,072,203	2,220
42	Montgomery County	Maryland	Rockville	1,058,810	1.313
43	Fulton County	Georgia	Atlanta	1,041,423	1,385
44	Pima County	Arizona	Tucson	1,022,769	23,799
45	St. Louis County	Missouri	Clayton	996.726	1,356
46	Fresno County	California	Fresno	989.255	15,585
47	Honolulu City and County	Hawaii	Honolulu	988.650	5,509
48	Westchester County	new York	White Plains	980.244	1,295
49	Pinellas County	Florida	Clearwater	970,637	1,574
50	Collin County	Texas	McKinney	969603	2,294
51	Milwaukee County	Wisconsin	Milwaukee	952.085	3,081
52	Marion County	Indiana	Indianapolis	950,082	1,044
53	Fairfield County	Connecticut	none	949.921	2.168
54	Bergen County	New Jersey	Hoe sack	948.406	639
55	Duval County	Florida	Jacksonville	937.934	2,378
56	Shelby County	Tennessee	Memphis	936.961	2,030
57	DuPage County	Illinois	Wheaton	930.128	872
58	Erie County	new York	Buffalo	925.528	3,178
59	Gwinnett County	Georgia	Lawrenceville	920.260	1,131
60	Prince George's County	Maryland	Upper Marlboro	912.756	1,291
61	Hartford County	Connecticut	none	895.388	1,944
62	Kern County	California	Bakersfield	893.119	21,138
63	San Francisco County	California	San Francisco	884.363	121
64	Pierce County	Washington	Tacoma	876.764	4,679
65	Macomb County	Michigan	Mount Clemens	871.375	1,476
66	Hidalgo County	Texas	Edinburgh	860.661	4,099
67	New Haven County	Connecticut	none	860.435	2.233
68	Ventura County	California	Ventura	854.223	5,719
69	Middlesex County	New Jersey	New Brunswick	842,798	835
70	El Paso County	Texas	El Paso	840.410	2,628
71	Denton County	Texas	The tone	836.210	2,481
72	Baltimore County	Maryland	Towson	832,468	1,766
73	Worcester County	Massachusetts	Worcester	826.116	4,090
74	Montgomery County	Pennsylvania	Norristown	826.075	1,262
75	Hamilton County	Ohio	Cincinnati	813.822	1,069
76	Essex County	New Jersey	Newark	808.285	336
77	Multnomah County	Oregon	Portland	807.555	1,206
78	Snohomish County	Washington	Everett	801.633	5,689
79	Suffolk County	Massachusetts	Boston	797.939	311
80	Oklahoma County	Oklahoma	Oklahoma City	787.958	1,860
81	Essex County	Massachusetts	Salem and Lawrence	785.205	2.146
82	San Mateo County	California	Redwood City	771.410	1.919
83	Jefferson County	Kentucky	Louisville	771.158	1,032
84	Fort Bend County	Texas	Richmond	764,828	2,265
85	Cobb County	Georgia	Marietta	755.754	881
86	DeKalb County	Georgia	Decatur	753.253	702
87	Monroe County	new York	Rochester	747,642	3,537
88	San Joaquin County	California	Stockton	745.424	3,694
89	Lee County	Florida	Fort Myers	739.224	3.139
90	Denver County	Colorado	Denver	704.621	401
91	Lake County	Illinois	Waukegan	703.520	3,543
92	Norfolk County	Massachusetts	Dedham	700,322	1,150
93	El Paso County	Colorado	Colorado Springs	699.232	5,516
94	Jackson County	Missouri	Kansas City and Independence	698.895	1,596
95	Will County	Illinois	Joliet	692,661	2,200
96	Hudson County	New Jersey	Jersey City	691,643	162
97	Davidson County	Tennessee	Nashville	691.243	1,363
98	Polk County	Florida	Bartow	686.483	5,206
99	Bernalillo County	New Mexico	Albuquerque	676.773	3,027
100	Jefferson County	Alabama	Birmingham	659.197	2,911

List of 10 largest boroughs , unorganized boroughs , parishes, and federal districts

rank	Surname	Administrative unit	State	Administrative center	Residents	Size [km²]
1	Washington, DC	Federal district	District of Columbia	Washington, DC	693.972	177
2	East Baton Rouge Parish	Parish	Louisiana	Baton Rouge	446.268	1,220
3	Jefferson Parish	Parish	Louisiana	Gretna	439.036	1,663
4th	Orleans Parish	Parish	Louisiana	New Orleans	393.292	907
5	Anchorage	Borough	Alaska	Anchorage	294,356	5,079
6th	St. Tammany Parish	Parish	Louisiana	Covington	256.327	2.212
7th	Caddo Parish	Parish	Louisiana	Shreveport	246,581	2,427
8th	Lafayette Parish	Parish	Louisiana	Lafayette	242,485	700
9	Calcasieu Parish	Parish	Louisiana	Lake Charles	202,445	2,834
10	Ouachita Parish	Parish	Louisiana	Monroe	155,874	1,639

See also

• County in the United States
• List of the 100 largest counties in the United States by area

Web links

All administrative units of the United States

Individual evidence

1. ↑ US Census Bureau: American FactFinder - Results. Retrieved June 25, 2018 .