List of the most populous counties in the United States

This is a list of the 100 most populous counties in the United States based on the national decennial US census conducted on April 1, 2010 and on April 1, 2020.

A map of the counties and county equivalents of the United States. The 100 most populous counties are highlighted, with counties having more than one million residents in orange and counties having fewer than one million residents in green, based on the results of the April 1, 2010 United States census.

Many of the counties on the list include major cities or metropolitan areas in all parts of the United States. Six of the listed counties have consolidated city and county government, namely the City and County of Honolulu, Metropolitan Government of Nashville and Davidson County, Tennessee, City and County of Philadelphia, City and County of San Francisco, City of Jacksonville and Duval County and City and County of Denver.[1][2][3] New York County, Bronx County, Kings County, Queens County and Richmond County are coterminous with the respective boroughs of New York City; they fall under the jurisdiction of the combined city government.

List

This list lists the most populous US counties and the District of Columbia sorted according to the 2020 official enumeration by the United States Census Bureau (USCB).

Rank	County	State	Land area		April 1, 2010 census	April 1, 2020 census	Mid-2010 to mid-2020 change		County seat
Rank	County	State	km²[4]	mi²[5]	April 1, 2010 census	April 1, 2020 census	absolute	%	County seat
1	Los Angeles	California	10,509.87	4,057.88	9,818,605	10,014,009	195,404	2.0	Los Angeles
2	Cook	Illinois	2,448.38	945.33	5,194,675	5,275,541	80,866	1.6	Chicago
3	Harris	Texas	4,411.99	1,703.48	4,092,459	4,731,145	638,686	15.6	Houston
4	Maricopa	Arizona	23,828.26	9,200.14	3,817,117	4,420,568	603,451	15.8	Phoenix
5	San Diego	California	10,895.12	4,206.63	3,095,313	3,298,634	203,321	6.6	San Diego
6	Orange	California	2,047.56	790.57	3,010,232	3,186,989	176,757	5.9	Santa Ana
7	Kings	New York	183.41	70.82	2,504,700	2,736,074	231,374	9.2	Brooklyn, NYC
8	Miami-Dade	Florida	4,915.06	1,897.72	2,496,435	2,701,767	205,332	8.2	Miami
9	Dallas	Texas	2,256.60	871.28	2,368,139	2,613,539	245,400	10.4	Dallas
10	Riverside	California	18,664.70	7,206.48	2,189,641	2,418,185	228,544	10.4	Riverside
11	Queens	New York	281.10	108.53	2,230,722	2,405,464	174,742	7.8	Queens, NYC
12	King	Washington	5,479.29	2,115.57	1,931,249	2,269,675	338,426	17.5	Seattle
13	Clark	Nevada	20,438.71	7,891.43	1,951,269	2,265,461	314,192	16.1	Las Vegas
14	San Bernardino	California	51,947.23	20,056.94	2,035,210	2,181,654	146,444	7.2	San Bernardino
15	Tarrant	Texas	2,236.74	863.61	1,809,034	2,110,640	301,606	16.7	Fort Worth
16	Bexar	Texas	3,211.12	1,239.82	1,714,773	2,009,324	294,551	17.2	San Antonio
17	Broward	Florida	3,133.33	1,209.79	1,748,066	1,944,375	196,309	11.2	Fort Lauderdale
18	Santa Clara	California	3,341.34	1,290.10	1,781,642	1,936,259	154,617	8.7	San Jose
19	Wayne	Michigan	1,585.28	612.08	1,820,584	1,793,561	-27,023	-1.5	Detroit
20	New York	New York	59.13	22.83	1,585,873	1,694,251	108,378	6.8	Manhattan, NYC
21	Alameda	California	1,914.05	739.02	1,510,271	1,682,353	172,082	11.4	Oakland
22	Middlesex	Massachusetts	2,118.14	817.82	1,503,085	1,632,002	128,917	8.6	Lowell and Cambridge
23	Philadelphia	Pennsylvania	347.32	134.10	1,526,006	1,603,797	77,791	5.1	Philadelphia
24	Sacramento	California	2,498.42	964.64	1,418,788	1,585,055	166,267	11.7	Sacramento
25	Suffolk	New York	2,362.20	912.05	1,493,350	1,525,920	32,570	2.2	Riverhead
26	Palm Beach	Florida	5,100.00	1,970.00	1,320,134	1,492,191	172,057	13.0	West Palm Beach
27	Bronx	New York	109.03	42.10	1,385,108	1,472,654	87,546	6.3	Bronx, NYC
28	Hillsborough	Florida	2,642.34	1,020.21	1,229,226	1,459,762	230,536	18.8	Tampa
29	Orange	Florida	2,339.87	903.43	1,145,956	1,429,908	283,952	24.8	Orlando
30	Nassau	New York	737.41	284.72	1,339,532	1,395,774	56,242	4.2	Mineola
31	Franklin	Ohio	1,378.36	532.19	1,163,414	1,323,807	160,393	13.8	Columbus
32	Travis	Texas	2,564.61	990.20	1,024,266	1,290,188	265,922	26.0	Austin
33	Hennepin	Minnesota	1,433.79	553.59	1,152,425	1,281,565	129,140	11.2	Minneapolis
34	Oakland	Michigan	2,247.24	867.66	1,202,362	1,274,395	72,033	6.0	Pontiac
35	Cuyahoga	Ohio	1,184.12	457.19	1,280,122	1,264,817	-15,305	-1.2	Cleveland
36	Allegheny	Pennsylvania	1,890.88	730.07	1,223,348	1,250,578	27,230	2.2	Pittsburgh
37	Salt Lake	Utah	1,922.50	742.28	1,029,655	1,185,238	155,583	15.1	Salt Lake City
38	Contra Costa	California	1,854.27	715.94	1,049,025	1,165,927	116,902	11.1	Martinez
39	Fairfax	Virginia	1,012.60	390.97	1,081,726	1,150,309	68,583	6.3	Fairfax
40	Wake	North Carolina	2,163.21	835.22	900,993	1,129,410	228,417	25.4	Raleigh
41	Mecklenburg	North Carolina	1,356.75	523.84	919,628	1,115,482	195,854	21.3	Charlotte
42	Fulton	Georgia	1,363.98	526.63	920,581	1,066,710	146,129	15.9	Atlanta
43	Collin	Texas	2,178.76	841.22	782,341	1,064,465	282,124	36.1	McKinney
44	Montgomery	Maryland	1,272.34	491.25	971,777	1,062,061	90,284	9.3	Rockville
45	Pima	Arizona	23,794.31	9,187.04	980,263	1,043,433	63,170	6.4	Tucson
46	Honolulu	Hawaii	1,555.92	600.74	953,207	1,016,508	63,301	6.6	Honolulu
47	Fresno	California	15,431.13	5,957.99	930,450	1,008,654	78,204	8.4	Fresno
48	Westchester	New York	1,114.98	430.50	949,113	1,004,457	55,344	5.8	White Plains
49	St. Louis	Missouri	1,315.20	507.80	998,954	1,004,125	5,171	0.5	Clayton
50	Duval	Florida	1,974.07	762.19	864,263	995,567	131,304	15.2	Jacksonville
51	Marion	Indiana	1,026.41	396.30	903,393	977,203	73,810	8.2	Indianapolis
52	Prince George's	Maryland	1,250.16	482.69	863,420	967,201	103,781	10.7	Upper Marlboro
53	Pinellas	Florida	709.14	273.80	916,542	959,107	42,565	4.6	Clearwater
54	Fairfield	Connecticut	1,618.46	624.89	916,829	957,419	40,590	4.4	Bridgeport
55	Gwinnett	Georgia	1,114.69	430.38	805,321	957,062	151,741	18.8	Lawrenceville
56	Bergen	New Jersey	603.49	233.01	905,116	955,732	50,616	5.6	Hackensack
57	Erie	New York	2,700.56	1,042.69	919,040	954,236	35,196	3.8	Buffalo
58	Milwaukee	Wisconsin	625.23	241.40	947,735	939,489	-8,246	-0.9	Milwaukee
59	DuPage	Illinois	848.22	327.50	916,924	932,877	15,953	1.7	Wheaton
60	Shelby	Tennessee	1,976.61	763.17	927,644	929,744	2,100	0.2	Memphis
61	Pierce	Washington	4,324.01	1,669.51	795,225	921,130	125,905	15.8	Tacoma
62	Kern	California	21,061.57	8,131.92	839,631	909,235	69,604	8.3	Bakersfield
63	Denton	Texas	2,275.13	878.43	662,614	906,422	243,808	36.8	Denton
64	Hartford	Connecticut	1,903.89	735.10	894,014	899,498	5,484	0.6	Hartford
65	Macomb	Michigan	1,241.18	479.22	840,978	881,217	40,239	4.8	Mount Clemens
66	San Francisco	California	121.40	46.87	805,235	873,965	68,730	8.5	San Francisco
67	Hidalgo	Texas	4,068.52	1,570.87	774,769	870,781	96,012	12.4	Edinburg
68	El Paso	Texas	2,622.86	1,012.69	800,647	865,657	65,010	8.1	El Paso
69	New Haven	Connecticut	1,565.66	604.51	862,477	864,835	2,358	0.3	New Haven
70	Essex	New Jersey	326.89	126.21	783,969	863,728	79,759	10.2	Newark
71	Middlesex	New Jersey	800.08	308.91	809,858	863,162	53,304	6.6	New Brunswick
72	Worcester	Massachusetts	3,912.88	1,510.77	798,552	862,111	63,559	8.0	Worcester
73	Montgomery	Pennsylvania	1,251.07	483.04	799,874	856,553	56,679	7.1	Norristown
74	Baltimore	Maryland	1,549.59	598.30	805,029	854,535	49,506	6.1	Towson
75	Ventura	California	4,773.69	1,843.13	823,318	843,843	20,525	2.5	Ventura
76	Hamilton	Ohio	1,051.30	405.91	802,374	830,639	28,265	3.5	Cincinnati
77	Snohomish	Washington	5,406.01	2,087.27	713,335	827,957	114,622	16.1	Everett
78	Fort Bend	Texas	2,292	885	585,375	822,779	237,404	40.6	Richmond
79	Multnomah	Oregon	1,117.05	431.30	735,334	815,428	80,094	10.9	Portland
80	Essex	Massachusetts	1,275.73	492.56	743,159	809,829	66,670	9.0	Salem and Lawrence
81	Suffolk	Massachusetts	150.62	58.15	722,023	797,936	75,913	10.5	Boston
82	Oklahoma	Oklahoma	1,835.83	708.82	718,633	796,292	77,659	10.8	Oklahoma City
83	Jefferson	Kentucky	985.27	380.42	741,096	782,969	41,873	5.7	Louisville
84	San Joaquin	California	3,603.51	1,391.32	685,306	779,233	93,927	13.7	Stockton
85	Cobb	Georgia	879.43	339.55	688,078	766,149	78,071	11.3	Marietta
86	San Mateo	California	1,161.37	448.41	718,451	764,442	45,991	6.4	Redwood City
87	DeKalb	Georgia	693.03	267.58	691,893	764,382	72,489	10.5	Decatur
88	Lee	Florida	2,031.88	784.51	618,754	760,822	142,068	23.0	Fort Myers
89	Monroe	New York	1,702.15	657.21	744,344	759,443	15,099	2.0	Rochester
90	El Paso	Colorado	5,508.39	2,126.80	622,263	730,395	108,132	17.4	Colorado Springs
91	Norfolk	Massachusetts	1,025.91	396.11	670,850	725,981	55,131	8.2	Dedham
92	Polk	Florida	4,660	1,798	602,095	725,046	122,951	20.4	Bartow
93	Hudson	New Jersey	119.63	46.19	634,266	724,854	90,588	12.5	Jersey City
94	Jackson	Missouri	1,565.55	604.46	674,158	717,204	43,046	6.4	Independence and Kansas City
95	Davidson	Tennessee	1,305.44	504.03	626,681	715,884	89,203	14.2	Nashville
96	Denver	Colorado	401.36	154.97	600,158	715,522	115,364	19.2	Denver
97	Lake	Illinois	1,149.10	443.67	703,462	714,342	10,880	1.5	Waukegan
98	Will	Illinois	2,167.58	836.91	677,560	696,355	18,795	2.8	Joliet
99	District of Columbia		177.0	68.34	601,723	689,545	87,822	14.6	N/A
100	Bernalillo	New Mexico	3,006.53	1,160.83	662,564	676,444	13,880	2.1	Albuquerque

Gallery

Downtown Los Angeles, county seat of Los Angeles County, California, the most populous county in the United States. County buildings and the civic center, pictured at the bottom right.
Downtown Chicago, in Cook County, Illinois, the second-most populous county in the United States.
Downtown Houston, located in Harris County, Texas, the third-most populous county in the United States.
Downtown Phoenix, Arizona, county seat of the fourth-most populous county in the United States, Maricopa.
Downtown San Diego, California. San Diego County is the fifth-most populous county in the United States.
Aerial view of Orange County, California, the sixth-most populous county in the United States.
Row houses in Brooklyn, Kings County, New York, the seventh-most populous county in the United States.
Downtown Miami in Miami-Dade County, the largest county in Florida, and the county seat of the eighth-most populous county in the United States.

References

"This Is Your City and County of Honolulu Government". City and County of Honolulu. Archived from the original on January 20, 2008. Retrieved January 23, 2008.
"City and County Organizational Chart". City and County of San Francisco. Archived from the original on February 3, 2008. Retrieved January 23, 2008.
"Active Colorado Municipalities as of January 26, 2010". Colorado Department of Local Affairs. Archived from the original on December 12, 2009. Retrieved January 26, 2010.
GeoHive - the United States of America - US States and Counties Archived April 30, 2012, at the Wayback Machine (attached Excel spreadsheet)
The area in square kilometers of the column to the left divided by 2.589988110336 (1.609344²).

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[1] "This Is Your City and County of Honolulu Government". City and County of Honolulu. Archived from the original on January 20, 2008. Retrieved January 23, 2008.

[2] "City and County Organizational Chart". City and County of San Francisco. Archived from the original on February 3, 2008. Retrieved January 23, 2008.

[3] "Active Colorado Municipalities as of January 26, 2010". Colorado Department of Local Affairs. Archived from the original on December 12, 2009. Retrieved January 26, 2010.

[GH-4] GeoHive - the United States of America - US States and Counties Archived April 30, 2012, at the Wayback Machine (attached Excel spreadsheet)

[Km2ToMi2-5] The area in square kilometers of the column to the left divided by 2.589988110336 (1.609344²).

United States county-related lists
General	Index By state or territory FIPS codes Former counties Secession proposals
Demographics	Population African-American majority Hispanic/Latino majority Native American majority Most populous counties by state or territory Most densely populated county least Life expectancy shortest longest
Economy	Highest-income Lowest-income Per capita income
Geography	Largest area Smallest area Island counties
Name origins	Etymologies A–D E–I J–M N–R S–Z Most common names Named after Confederate historical figures Named after rivers Named after U.S. Presidents Named after women
See also	County statistics of the United States Smithsonian trinomial