List of the most populous counties in the United States

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.

This is a list of the 100 largest counties in the United States by population based on the national decennial US census conducted on 1 April 2010 and subsequent mid-2010 and mid-2014 official estimates released by the United States Census Bureau (USCB).

Many of the counties on the list include major cities or metropolitan areas. Five 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 and City and County of Denver.^[1][2][3] Queens County, Kings County, New York County, Bronx County, and Richmond County, New York are coterminous with boroughs of New York City, fall under the jurisdiction of the combined city government, and therefore lack a county seat (with the exception of Queens, whose county seat is Jamaica). Each of the four most populous counties is listed instead with the location of its county courthouse.

List of the most populous US counties sorted according to the mid-2014 official estimate by the USCB

Rank	County	State	Land area (km²)[4]	Land area (mi²)[5]	April 1, 2010 census	April 1, 2010 density (/km²)	April 1, 2010 density (/mi²)	July 1, 2010 official estimate	July 1, 2010 density (/km²)	July 1, 2010 density (/mi²)	July 1, 2014 official estimate	July 1, 2014 density (/km²)	July 1, 2014 density (/mi²)	Mid-2010 to mid-2014 change (Absolute)	Mid-2010 to mid-2014 change (%)	County seat or courthouse
1	Los Angeles County	California	10,509.87	4,057.88	9,818,605	934	2,420	9,826,773	935	2,422	10,116,705	963	2,493	289,932	2.95	Los Angeles
2	Cook County	Illinois	2,448.38	945.33	5,194,675	2,122	5,495	5,199,971	2,124	5,501	5,246,456	2,143	5,550	46,485	0.89	Chicago
3	Harris County	Texas	4,411.99	1,703.48	4,092,459	928	2,402	4,109,362	931	2,412	4,441,370	1,007	2,607	332,008	8.08	Houston
4	Maricopa County	Arizona	23,828.26	9,200.14	3,817,117	160	415	3,824,834	161	416	4,087,191	172	444	262,357	6.86	Phoenix
5	San Diego County	California	10,895.12	4,206.63	3,095,313	284	736	3,105,115	285	738	3,263,431	300	776	158,316	5.10	San Diego
6	Orange County	California	2,047.56	790.57	3,010,232	1,470	3,808	3,017,598	1,474	3,817	3,145,515	1,536	3,979	127,917	4.24	Santa Ana
7	Miami-Dade County	Florida	4,915.06	1,897.72	2,496,435	508	1,315	2,503,034	509	1,319	2,662,874	542	1,403	159,840	6.00	Miami
8	Kings County	New York	183.41	70.82	2,504,700	13,656	35,370	2,508,515	13,677	35,423	2,621,793	14,295	37,021	113,278	4.52	Brooklyn
9	Dallas County	Texas	2,256.60	871.28	2,368,139	1,049	2,718	2,375,207	1,053	2,726	2,518,638	1,116	2,891	143,431	6.04	Dallas
10	Riverside County	California	18,664.70	7,206.48	2,189,641	117	304	2,202,978	118	306	2,329,271	125	323	126,293	5.73	Riverside
11	Queens County	New York	281.10	108.53	2,230,722	7,936	20,553	2,233,895	7,947	20,583	2,321,580	8,259	21,391	87,685	3.93	Jamaica
12	San Bernardino County	California	51,947.23	20,056.94	2,035,210	39	101	2,042,027	39	102	2,112,619	41	105	70,592	3.46	San Bernardino
13	King County	Washington	5,479.29	2,115.57	1,931,249	352	913	1,937,157	354	916	2,079,967	380	983	142,810	7.37	Seattle
14	Clark County	Nevada	20,438.71	7,891.43	1,951,269	95	247	1,953,927	96	248	2,069,681	101	262	115,754	5.92	Las Vegas
15	Tarrant County	Texas	2,236.74	863.61	1,809,034	809	2,095	1,816,850	812	2,104	1,945,360	870	2,253	128,510	7.07	Fort Worth
16	Santa Clara County	California	3,341.34	1,290.10	1,781,642	533	1,381	1,786,267	535	1,385	1,894,605	567	1,469	108,338	6.07	San Jose
17	Broward County	Florida	3,133.33	1,209.79	1,748,066	558	1,445	1,752,122	559	1,448	1,869,235	597	1,545	117,113	6.68	Fort Lauderdale
18	Bexar County	Texas	3,211.12	1,239.82	1,714,773	534	1,383	1,723,561	537	1,390	1,855,866	578	1,497	132,305	7.68	San Antonio
19	Wayne County	Michigan	1,585.28	612.08	1,820,584	1,148	2,974	1,815,246	1,145	2,966	1,764,804	1,113	2,883	-50,442	-2.78	Detroit
20	New York County	New York	59.13	22.83	1,585,873	26,820	69,464	1,587,481	26,847	69,534	1,636,268	27,672	71,672	48,787	3.07	New York
21	Philadelphia County	Pennsylvania	347.32	134.10	1,526,006	4,394	11,380	1,528,074	4,400	11,395	1,536,471	4,424	11,458	8,397	0.55	Philadelphia
22	Alameda County	California	1,914.05	739.02	1,510,271	789	2,044	1,513,043	790	2,047	1,529,875	799	2,070	16,832	1.11	Oakland
23	Middlesex County	Massachusetts	2,118.14	817.82	1,503,085	710	1,838	1,505,720	711	1,841	1,518,171	717	1,856	12,451	0.83	Cambridge and Lowell
24	Suffolk County	New York	2,362.20	912.05	1,493,350	632	1,637	1,494,388	633	1,638	1,498,816	635	1,643	4,428	0.30	Riverhead
25	Sacramento County	California	2,498.42	964.64	1,418,788	568	1,471	1,422,094	569	1,474	1,436,105	575	1,489	14,011	0.99	Sacramento
26	Bronx County	New York	109.03	42.10	1,385,108	12,704	32,903	1,387,159	12,723	32,952	1,392,002	12,767	33,067	4,843	0.35	Bronx
27	Nassau County	New York	737.41	284.72	1,339,532	1,817	4,705	1,341,033	1,819	4,710	1,344,436	1,823	4,722	3,403	0.25	Mineola
28	Palm Beach County	Florida	5,101.66	1,969.76	1,320,134	259	670	1,322,924	259	672	1,335,187	262	678	12,263	0.93	West Palm Beach
29	Cuyahoga County	Ohio	1,184.12	457.19	1,280,122	1,081	2,800	1,278,000	1,079	2,795	1,270,294	1,073	2,778	-7,706	-0.60	Cleveland
30	Hillsborough County	Florida	2,642.34	1,020.21	1,229,226	465	1,205	1,233,373	467	1,209	1,267,775	480	1,243	34,402	2.79	Tampa
31	Allegheny County	Pennsylvania	1,890.88	730.07	1,223,348	647	1,676	1,224,833	648	1,678	1,227,066	649	1,681	2,233	0.18	Pittsburgh
32	Oakland County	Michigan	2,247.24	867.66	1,202,362	535	1,386	1,202,682	535	1,386	1,210,145	539	1,395	7,463	0.62	Pontiac
33	Franklin County	Ohio	1,378.36	532.19	1,163,414	844	2,186	1,165,789	846	2,191	1,178,799	855	2,215	13,010	1.12	Columbus
34	Orange County	Florida	2,339.87	903.43	1,145,956	490	1,268	1,148,787	491	1,272	1,169,107	500	1,294	20,320	1.77	Orlando
35	Hennepin County	Minnesota	1,433.79	553.59	1,152,425	804	2,082	1,154,067	805	2,085	1,168,431	815	2,111	14,364	1.24	Minneapolis
36	Fairfax County	Virginia	1,012.60	390.97	1,081,726	1,068	2,767	1,085,934	1,072	2,778	1,100,692	1,087	2,815	14,758	1.36	Fairfax
37	Contra Costa County	California	1,854.27	715.94	1,049,025	566	1,465	1,052,605	568	1,470	1,066,096	575	1,489	13,491	1.28	Martinez
38	Travis County	Texas	2,564.61	990.20	1,024,266	399	1,034	1,030,588	402	1,041	1,063,130	415	1,074	32,542	3.16	Austin
39	Salt Lake County	Utah	1,922.50	742.28	1,029,655	536	1,387	1,033,223	537	1,392	1,048,985	546	1,413	15,762	1.53	Salt Lake City
40	St. Louis County	Missouri	1,315.20	507.80	998,954	760	1,967	998,772	759	1,967	998,692	759	1,967	-80	-0.01	Clayton
41	Montgomery County	Maryland	1,272.34	491.25	971,777	764	1,978	975,439	767	1,986	989,794	778	2,015	14,355	1.47	Rockville
42	Pima County	Arizona	23,794.31	9,187.04	980,263	41	107	982,108	41	107	989,569	42	108	7,461	0.76	Tucson
43	Honolulu County	Hawaii	1,555.92	600.74	953,207	613	1,587	955,636	614	1,591	963,607	619	1,604	7,971	0.83	Honolulu
44	Westchester County	New York	1,114.98	430.50	949,113	851	2,205	950,283	852	2,207	955,899	857	2,220	5,616	0.59	White Plains
45	Milwaukee County	Wisconsin	625.23	241.40	947,735	1,516	3,926	948,623	1,517	3,930	952,532	1,523	3,946	3,909	0.41	Milwaukee
46	Fulton County	Georgia	1,363.98	526.63	920,581	675	1,748	925,920	679	1,758	949,599	696	1,803	23,679	2.56	Atlanta
47	Mecklenburg County	North Carolina	1,356.75	523.84	919,628	678	1,756	923,141	680	1,762	944,373	696	1,803	21,232	2.30	Charlotte
48	Fresno County	California	15,431.13	5,957.99	930,450	60	156	933,168	60	157	942,904	61	158	9,736	1.04	Fresno
49	Shelby County	Tennessee	1,976.61	763.17	927,644	469	1,216	928,930	470	1,217	935,088	473	1,225	6,158	0.66	Memphis
50	Wake County	North Carolina	2,163.21	835.22	900,993	417	1,079	906,788	419	1,086	929,780	430	1,113	22,992	2.54	Raleigh
51	Fairfield County	Connecticut	1,618.46	624.89	916,829	566	1,467	918,339	567	1,470	925,899	572	1,482	7,560	0.82	Bridgeport
52	DuPage County	Illinois	848.22	327.50	916,924	1,081	2,800	917,942	1,082	2,803	923,222	1,088	2,819	5,280	0.58	Wheaton
53	Erie County	New York	2,700.56	1,042.69	919,040	340	881	918,751	340	881	918,028	340	880	-,723	-0.08	Buffalo
54	Pinellas County	Florida	709.14	273.80	916,542	1,292	3,347	916,220	1,292	3,346	917,398	1,294	3,351	1,178	0.13	Clearwater
55	Marion County	Indiana	1,026.41	396.30	903,393	880	2,280	904,789	882	2,283	911,296	888	2,300	6,507	0.72	Indianapolis
56	Bergen County	New Jersey	603.49	233.01	905,116	1,500	3,884	906,184	1,502	3,889	911,004	1,510	3,910	4,820	0.53	Hackensack
57	Hartford County	Connecticut	1,903.89	735.10	894,014	470	1,216	894,127	470	1,216	894,705	470	1,217	578	0.06	Hartford
58	Prince George's County	Maryland	1,250.16	482.69	863,420	691	1,789	865,219	692	1,792	871,233	697	1,805	6,014	0.70	Upper Marlboro
59	Duval County	Florida	1,974.07	762.19	864,263	438	1,134	865,420	438	1,135	870,709	441	1,142	5,289	0.61	Jacksonville
60	New Haven County	Connecticut	1,565.66	604.51	862,477	551	1,427	862,438	551	1,427	861,113	550	1,424	-1,325	-0.15	New Haven and Waterbury
61	Kern County	California	21,061.57	8,131.92	839,631	40	103	842,813	40	104	851,710	40	105	8,897	1.06	Bakersfield
62	Macomb County	Michigan	1,241.18	479.22	840,978	678	1,755	840,944	678	1,755	842,145	679	1,757	1,201	0.14	Mount Clemens
63	Ventura County	California	4,773.69	1,843.13	823,318	172	447	825,445	173	448	831,771	174	451	6,326	0.77	Ventura
64	Gwinnett County	Georgia	1,114.69	430.38	805,321	722	1,871	808,291	725	1,878	824,941	740	1,917	16,650	2.06	Lawrenceville
65	El Paso County	Texas	2,622.86	1,012.69	800,647	305	791	803,995	307	794	820,790	313	811	16,795	2.09	El Paso
66	Middlesex County	New Jersey	800.08	308.91	809,858	1,012	2,622	810,747	1,013	2,625	814,217	1,018	2,636	3,470	0.43	New Brunswick
67	San Francisco County	California	121.40	46.87	805,235	6,633	17,179	805,340	6,634	17,181	812,826	6,695	17,341	7,486	0.93	San Francisco
68	Collin County	Texas	2,178.76	841.22	782,341	359	930	788,511	362	937	812,226	373	966	23,715	3.01	McKinney
69	Baltimore County	Maryland	1,549.59	598.30	805,029	520	1,346	805,964	520	1,347	809,941	523	1,354	3,977	0.49	Towson
70	Pierce County	Washington	4,324.01	1,669.51	795,225	184	476	795,371	184	476	807,904	187	484	12,533	1.58	Tacoma
71	Montgomery County	Pennsylvania	1,251.07	483.04	799,874	639	1,656	800,482	640	1,657	804,210	643	1,665	3,728	0.47	Norristown
72	Worcester County	Massachusetts	3,912.88	1,510.77	798,552	204	529	799,300	204	529	801,227	205	530	1,927	0.24	Worcester
73	Hamilton County	Ohio	1,051.30	405.91	802,374	763	1,977	801,948	763	1,976	800,362	761	1,972	-1,586	-0.20	Cincinnati
74	Hidalgo County	Texas	4,068.52	1,570.87	774,769	190	493	780,030	192	497	797,810	196	508	17,780	2.28	Edinburg
75	Essex County	New Jersey	326.89	126.21	783,969	2,398	6,211	784,099	2,399	6,213	785,137	2,402	6,221	1,038	0.13	Newark
76	Essex County	Massachusetts	1,275.73	492.56	743,159	583	1,509	744,484	584	1,511	748,930	587	1,520	4,446	0.60	Salem
77	Multnomah County	Oregon	1,117.05	431.30	735,334	658	1,705	737,476	660	1,710	748,031	670	1,734	10,555	1.43	Portland
78	Jefferson County	Kentucky	985.27	380.42	741,096	752	1,948	742,176	753	1,951	746,906	758	1,963	4,730	0.64	Louisville
79	Monroe County	New York	1,702.15	657.21	744,344	437	1,133	744,635	437	1,133	745,625	438	1,135	990	0.13	Rochester
80	Oklahoma County	Oklahoma	1,835.83	708.82	718,633	391	1,014	721,298	393	1,018	732,371	399	1,033	11,073	1.54	Oklahoma City
81	Suffolk County	Massachusetts	150.62	58.15	722,023	4,794	12,416	722,731	4,798	12,428	730,932	4,853	12,569	8,201	1.13	Boston
82	San Mateo County	California	1,161.37	448.41	718,451	619	1,602	719,604	620	1,605	727,209	626	1,622	7,605	1.06	Redwood City
83	Snohomish County	Washington	5,406.01	2,087.27	713,335	132	342	715,358	132	343	722,400	134	346	7,042	0.98	Everett
84	Lake County	Illinois	1,149.10	443.67	703,462	612	1,586	704,492	613	1,588	706,222	615	1,592	1,730	0.25	Waukegan
85	DeKalb County	Georgia	693.03	267.58	691,893	998	2,586	692,858	1,000	2,589	699,893	1,010	2,616	7,035	1.02	Decatur
86	Cobb County	Georgia	879.43	339.55	688,078	782	2,026	689,749	784	2,031	697,553	793	2,054	7,804	1.13	Marietta
87	San Joaquin County	California	3,603.51	1,391.32	685,306	190	493	687,661	191	494	696,214	193	500	8,553	1.24	Stockton
88	Denton County	Texas	2,275.13	878.43	662,614	291	754	667,138	293	759	686,406	302	781	19,268	2.89	Denton
89	Will County	Illinois	2,167.58	836.91	677,560	313	810	678,873	313	811	681,545	314	814	2,672	0.39	Joliet
90	Jackson County	Missouri	1,565.55	604.46	674,158	431	1,115	674,953	431	1,117	676,360	432	1,119	1,407	0.21	Independence, Missouri and Kansas City
91	Norfolk County	Massachusetts	1,025.91	396.11	670,850	654	1,694	672,107	655	1,697	675,436	658	1,705	3,329	0.50	Dedham
92	Bernalillo County	New Mexico	3,006.53	1,160.83	662,564	220	571	664,425	221	572	670,968	223	578	6,543	0.98	Albuquerque
93	Jefferson County	Alabama	2,878.19	1,111.28	658,466	229	593	658,386	229	592	658,931	229	593	545	0.08	Birmingham
94	Hudson County	New Jersey	119.63	46.19	634,266	5,302	13,732	634,979	5,308	13,747	641,224	5,360	13,882	6,245	0.98	Jersey City
95	El Paso County	Colorado	5,508.39	2,126.80	622,263	113	293	627,159	114	295	636,963	116	299	9,804	1.56	Colorado Springs
96	Davidson County	Tennessee	1,305.44	504.03	626,681	480	1,243	628,053	481	1,246	635,475	487	1,261	7,422	1.18	Nashville
97	Lee County	Florida	2,031.88	784.51	618,754	305	789	620,450	305	791	631,330	311	805	10,880	1.75	Fort Myers
98	Monmouth County	New Jersey	1,214.17	468.79	630,380	519	1,345	630,920	520	1,346	631,020	520	1,346	100	0.02	Freehold
99	Bucks County	Pennsylvania	1,565.15	604.31	625,249	399	1,035	625,618	400	1,035	626,854	401	1,037	1,236	0.20	Doylestown
100	Providence County	Rhode Island	1,060.60	409.50	626,667	591	1,530	626,797	591	1,531	626,709	591	1,530	-88	-0.01	Providence
Rank	County	State	Land area (km²)[4]	Land area (mi²)[5]	April 1, 2010 census	April 1, 2010 density (/km²)	April 1, 2010 density (/mi²)	July 1, 2010 official estimate	July 1, 2010 density (/km²)	July 1, 2010 density (/mi²)	July 1, 2014 official estimate	July 1, 2014 density (/km²)	July 1, 2014 density (/mi²)	Mid-2010 to mid-2014 change (Absolute)	Mid-2010 to mid-2014 change (%)	County seat or courthouse

Gallery

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  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.

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  Downtown Chicago, in Cook County, Illinois, the second most populous county in the United States.

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  Downtown Houston, located in Harris County, Texas, the third most populous county in the United States.

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  Downtown Phoenix, Arizona, county seat of the fourth most populous county in the United States, Maricopa County, Arizona.

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  Downtown San Diego, California. San Diego County is the fifth most populous county in the United States.

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  Aerial view of Orange County, California, the 6th most populous county in the United States.

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  Downtown Miami in Miami-Dade County, the 3rd largest county in Florida, and the county seat of the 7th most populous county in the United States.

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  Row houses in Brooklyn, Kings County, New York, the 8th most populous county in the United States.

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  Seattle, seat of King County, Washington; King County ranks as the 13th most populous county in the United States.

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  The Guardian Building in Detroit, headquarters of Michigan's Wayne County, 19th most populous county in the United States.

References

1. "This Is Your City and County of Honolulu Government". City and County of Honolulu. Retrieved 2008-01-23.
2. "City and County Organizational Chart". City and County of San Francisco. Retrieved 2008-01-23.
3. "Active Colorado Municipalities as of January 26, 2010". Colorado Department of Local Affairs. Retrieved 2010-01-26.
4. GeoHive - the United States of America - US States and Counties (attached Excel spreadsheet)
5. The area in square kilometers of the column to the left divided by 2.589988110336 (1.609344²).