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'List of the largest counties in the United States (by population)'.
The following are the population estimates for July 1, 2006.

Rank	County	Population	County Seat or Courthouse
1	Los Angeles County, California	9,948,081	Los Angeles
2	Cook County, Illinois	5,288,655	Chicago
3	Harris County, Texas	3,886,207	Houston
4	Maricopa County, Arizona	3,768,123	Phoenix
5	Orange County, California	3,002,048	Santa Ana
6	San Diego County, California	2,941,454	San Diego
7	Kings County, New York	2,508,820	Brooklyn
8	Miami-Dade County, Florida	2,402,208	Miami
9	Dallas County, Texas	2,345,815	Dallas
10	Queens County, New York	2,255,175	Queens
11	Riverside County, California	2,026,803	Riverside
12	San Bernardino County, California	1,999,332	San Bernardino
13	Wayne County, Michigan	1,946,419	Detroit
14	King County, Washington	1,826,732	Seattle
15	Broward County, Florida	1,787,636	Fort Lauderdale
16	Clark County, Nevada	1,777,539	Las Vegas
17	Santa Clara County, California	1,731,281	San Jose
18	Tarrant County, Texas	1,671,295	Fort Worth
19	New York County, New York	1,611,581	New York
20	Bexar County, Texas	1,555,592	San Antonio
21	Suffolk County, New York	1,469,715	Riverhead
22	Middlesex County, Massachusetts	1,467,016	Cambridge
23	Alameda County, California	1,457,426	Oakland
24	Philadelphia County, Pennsylvania	1,448,905	Philadelphia
25	Sacramento County, California	1,374,724	Sacramento
26	Bronx County, New York	1,361,473	The Bronx
27	Nassau County, New York	1,325,662	Mineola
28	Cuyahoga County, Ohio	1,314,241	Cleveland
29	Palm Beach County, Florida	1,274,013	West Palm Beach
30	Allegheny County, Pennsylvania	1,223,411	Pittsburgh
31	Oakland County, Michigan	1,214,255	Pontiac
32	Hillsborough County, Florida	1,157,738	Tampa
33	Hennepin County, Minnesota	1,122,093	Minneapolis
34	Franklin County, Ohio	1,095,662	Columbus
35	Orange County, Florida	1,043,500	Orlando
36	Contra Costa County, California	1,024,319	Martinez
37	Fairfax County, Virginia	1,010,443	Fairfax
38	Saint Louis County, Missouri	1,000,510	Clayton
39	Salt Lake County, Utah	978,701	Salt Lake City
40	Fulton County, Georgia	960,009	Atlanta
41	Westchester County, New York	949,355	White Plains
42	Pima County, Arizona	946,362	Tucson
43	DuPage County, Illinois	932,670	Wheaton
44	Montgomery County, Maryland	932,131	Rockville
45	Pinellas County, Florida	924,413	Clearwater
46	Erie County, New York	921,390	Buffalo
47	Travis County, Texas	921,006	Austin
48	Milwaukee County, Wisconsin	915,097	Milwaukee
50	Honolulu County, Hawaii	909,863	Honolulu
51	Shelby County, Tennessee	905,266	Memphis
52	Bergen County, New Jersey	904,037	Hackensack
53	Fairfield County, Connecticut	900,440	Bridgeport
54	Fresno County, California	891,756	Fresno
55	Hartford County, Connecticut	876,927	Hartford
56	Marion County, Indiana	865,504	Indianapolis
57	New Haven County, Connecticut	845,244	New Haven
58	Prince George's County, Maryland	841,315	Upper Marlboro
59	Duval County, Florida	837,964	Jacksonville
60	Macomb County, Michigan	832,861	Mount Clemens
61	Mecklenburg County, North Carolina	827,445	Charlotte
62	Hamilton County, Ohio	822,596	Cincinnati
63	Ventura County, California	799,720	Ventura
64	Essex County, New Jersey	791,057	Newark
65	Middlesex County, New Jersey	789,516	New Brunswick
66	Baltimore County, Maryland	787,384	Towson
67	Wake County, North Carolina	786,522	Raleigh
68	Worcester County, Massachusetts	784,992	Worcester
69	Kern County, California	780,117	Bakersfield
70	Montgomery County, Pennsylvania	775,688	Norristown
71	Pierce County, Washington	766,878	Tacoma
72	Gwinnett County, Georgia	757,104	Lawrenceville
73	San Francisco County, California	744,041	San Francisco
74	El Paso County, Texas	736,310	El Paso
75	Essex County, Massachusetts	735,958	Salem
76	Monroe County, New York	730,807	Rochester
77	DeKalb County, Georgia	723,602	Decatur
78	Lake County, Illinois	713,076	Waukegan
79	San Mateo County, California	705,499	Redwood City
80	Jefferson County, Kentucky	701,500	Louisville
81	Hidalgo County, Texas	700,634	Edinburg
82	Collin County, Texas	698,851	McKinney
83	Oklahoma County, Oklahoma	691,266	Oklahoma City
84	Suffolk County, Massachusetts	687,610	Boston
85	Multnomah County, Oregon	681,454	Portland
86	Cobb County, Georgia	679,325	Marietta
87	San Joaquin County, California	673,170	Stockton
88	Snohomish County, Washington	669,887	Everett
89	Will County, Illinois	668,217	Joliet
90	Jackson County, Missouri	664,078	Independence
91	Jefferson County, Alabama	656,700	Birmingham
92	Norfolk County, Massachusetts	654,753	Dedham
93	Providence County, Rhode Island	635,596	Providence
94	Monmouth County, New Jersey	635,285	Freehold Borough
95	Baltimore City	631,366	Baltimore
96	Bucks County, Pennsylvania	623,205	Doylestown
97	Bernalillo County, New Mexico	615,099	Albuquerque
98	Davidson County, Tennessee	607,413	Nashville
99	Hudson County, New Jersey	601,146	Jersey City
100	Kent County, Michigan	599,524	Grand Rapids

Contents

References

References

★ 100 Largest Counties. ''United States Census Bureau''.