List of the most populous counties in the United States
List
This list lists the most populous US counties sorted according to the mid-2018 official estimate by the United States Census Bureau (USCB).

List of the most populous counties in the United States

Section Title: List
Table Section Text: This list lists the most populous US counties sorted according to the mid-2018 official estimate by the United States Census Bureau (USCB).

Rank	County	State	Land area (km2)	Land area (mi2)	April 1, 2010 census	July 1, 2018 official estimate	Mid-2010 to mid-2018 change (absolute)	Mid-2010 to mid-2018 change (%)	County seat

1	Los Angeles	California	10,509.87	4,057.88	9,818,605	10,105,518	344,902	3.51	Los Angeles

2	Cook	Illinois	2,448.38	945.33	5,194,675	5,180,493	16,588	0.32	Chicago

3	Harris	Texas	4,411.99	1,703.48	4,092,459	4,698,619	560,521	13.70	Houston

4	Maricopa	Arizona	23,828.26	9,200.14	3,817,117	4,410,824	489,916	12.83	Phoenix

5	San Diego	California	10,895.12	4,206.63	3,095,313	3,343,364	242,372	7.83	San Diego

6	Orange	California	2,047.56	790.57	3,010,232	3,185,968	180,168	5.99	Santa Ana

7	Miami-Dade	Florida	4,915.06	1,897.72	2,496,435	2,761,581	255,361	10.23	Miami

8	Dallas	Texas	2,256.60	871.28	2,368,139	2,637,772	250,009	10.56	Dallas

9	Kings	New York	183.41	70.82	2,504,700	2,582,830	144,071	5.75	Brooklyn, New York City

10	Riverside	California	18,664.70	7,206.48	2,189,641	2,450,758	233,625	10.67	Riverside

11	Queens	New York	281.10	108.53	2,230,722	2,278,906	127,860	5.73	Jamaica, Queens, NYC

12	King	Washington	5,479.29	2,115.57	1,931,249	2,233,163	257,400	13.33	Seattle

13	Clark	Nevada	20,438.71	7,891.43	1,951,269	2,231,647	252,810	12.96	Las Vegas

14	San Bernardino	California	51,947.23	20,056.94	2,035,210	2,171,603	122,194	6.00	San Bernardino

15	Tarrant	Texas	2,236.74	863.61	1,809,034	2,084,931	245,441	13.57	Fort Worth

16	Bexar	Texas	3,211.12	1,239.82	1,714,773	1,986,049	243,805	14.22	San Antonio

17	Broward	Florida	3,133.33	1,209.79	1,748,066	1,951,260	243,805	14.22	Fort Lauderdale

18	Santa Clara	California	3,341.34	1,290.10	1,781,642	1,937,570	156,511	8.78	San Jose

19	Wayne	Michigan	1,585.28	612.08	1,820,584	1,753,893	66,968	3.68	Detroit

20	Alameda	California	1,914.05	739.02	1,510,271	1,666,753	152,919	10.13	Oakland

21	New York	New York	59.13	22.83	1,585,873	1,628,701	78,854	4.97	Manhattan, NYC

22	Middlesex	Massachusetts	2,118.14	817.82	1,503,085	1,614,714	99,862	6.64	Lowell and Cambridge

23	Philadelphia	Pennsylvania	347.32	134.10	1,526,006	1,584,138	54,857	3.59	Philadelphia

24	Sacramento	California	2,498.42	964.64	1,418,788	1,540,975	111,827	7.88	Sacramento

25	Palm Beach	Florida	5,101.66	1,969.76	1,320,134	1,485,941	151,016	11.44	West Palm Beach

26	Suffolk	New York	2,362.20	912.05	1,493,350	1,481,093	397	0.03	Riverhead

27	Hillsborough	Florida	2,642.34	1,020.21	1,229,226	1,436,888	179,340	14.59	Tampa

28	Bronx	New York	109.03	42.10	1,385,108	1,432,132	86,502	6.21	Bronx, NYC

29	Nassau	New York	737.41	284.72	1,339,532	1,358,343	29,982	2.24	Mineola

30	Orange	Florida	2,339.87	903.43	1,145,956	1,348,975	203,019	17.72	Orlando

31	Franklin	Ohio	1,378.36	532.19	1,163,414	1,310,300	128,567	11.05	Columbus

32	Hennepin	Minnesota	1,433.79	553.59	1,152,425	1,259,428	99,599	8.64	Minneapolis

33	Oakland	Michigan	2,247.24	867.66	1,202,362	1,259,201	48,474	4.03	Pontiac

34	Travis	Texas	2,564.61	990.20	1,024,266	1,248,743	202,432	19.76	Austin

35	Cuyahoga	Ohio	1,184.12	457.19	1,280,122	1,243,857	31,608	2.47	Cleveland

36	Allegheny	Pennsylvania	1,890.88	730.07	1,223,348	1,218,452	300	0.02	Pittsburgh

37	Salt Lake	Utah	1,922.50	742.28	1,029,655	1,152,633	105,994	10.29	Salt Lake City

38	Fairfax	Virginia	1,012.60	390.97	1,081,726	1,150,795	66,707	6.17	Fairfax

39	Contra Costa	California	1,854.27	715.94	1,049,025	1,150,215	98,414	9.38	Martinez

40	Mecklenburg	North Carolina	1,356.75	523.84	919,628	1,093,901	157,209	17.09	Charlotte

41	Wake	North Carolina	2,163.21	835.22	900,993	1,092,305	171,210	19.00	Raleigh

42	Montgomery	Maryland	1,272.34	491.25	971,777	1,052,567	87,033	8.96	Rockville

43	Fulton	Georgia	1,363.98	526.63	920,581	1,050,114	120,842	13.13	Atlanta

44	Pima	Arizona	23,794.31	9,187.04	980,263	1,039,073	42,506	4.34	Tucson

45	Collin	Texas	2,178.76	841.22	782,341	1,005,146	187,262	23.94	McKinney

46	St. Louis	Missouri	1,315.20	507.80	998,954	996,945	2,228	0.22	Clayton

47	Fresno	California	15,431.13	5,957.99	930,450	994,400	58,805	6.32	Fresno

48	Honolulu	Hawaii	1,555.92	600.74	953,207	980,080	35,443	3.72	Honolulu

49	Pinellas	Florida	709.14	273.80	916,542	975,280	54,095	5.90	Clearwater

50	Westchester	New York	1,114.98	430.50	949,113	967,612	31,131	3.28	White Plains

51	Marion	Indiana	1,026.41	396.30	903,393	954,670	46,689	5.17	Indianapolis

52	Duval	Florida	1,974.07	762.19	864,263	950,181	73,761	8.52	Jacksonville

53	Milwaukee	Wisconsin	625.23	241.40	947,735	948,201	4,350	0.46	Milwaukee

54	Fairfield	Connecticut	1,618.46	624.89	916,829	943,823	33,091	3.61	Bridgeport

55	Bergen	New Jersey	603.49	233.01	905,116	936,692	43,290	4.78	Hackensack

56	Shelby	Tennessee	1,976.61	763.17	927,644	935,764	9,317	1.00	Memphis

57	DuPage	Illinois	848.22	327.50	916,924	928,589	13,204	1.44	Wheaton

58	Gwinnett	Georgia	1,114.69	430.38	805,321	927,781	114,939	14.27	Lawrenceville

59	Erie	New York	2,700.56	1,042.69	919,040	919,719	6,488	0.71	Buffalo

60	Prince George's	Maryland	1,250.16	482.69	863,420	909,308	49,226	5.71	Upper Marlboro

61	Kern	California	21,061.57	8,131.92	839,631	896,764	53,488	6.37	Bakersfield

62	Hartford	Connecticut	1,903.89	735.10	894,014	892,697	1,374	0.15	Hartford

63	Pierce	Washington	4,324.01	1,669.51	795,225	891,299	81,539	10.25	Tacoma

64	San Francisco	California	121.40	46.87	805,235	883,305	79,128	9.83	San Francisco

65	Macomb	Michigan	1,241.18	479.22	840,978	874,759	30,397	3.61	Mount Clemens

66	Hidalgo	Texas	4,068.52	1,570.87	774,769	865,939	85,892	11.09	Edinburg

67	Denton	Texas	2,275.13	878.43	662,614	859,064	173,596	26.20	Denton

68	New Haven	Connecticut	1,565.66	604.51	862,477	857,620	2,042	0.24	New Haven

69	Ventura	California	4,773.69	1,843.13	823,318	850,967	30,905	3.75	Ventura

70	El Paso	Texas	2,622.86	1,012.69	800,647	840,758	39,763	4.97	El Paso

71	Worcester	Massachusetts	3,912.88	1,510.77	798,552	830,839	27,564	3.45	Worcester

72	Middlesex	New Jersey	800.08	308.91	809,858	829,685	32,940	4.07	New Brunswick

73	Montgomery	Pennsylvania	1,251.07	483.04	799,874	828,604	26,201	3.28	Norristown

74	Baltimore	Maryland	1,549.59	598.30	805,029	828,431	27,439	3.41	Towson

75	Hamilton	Ohio	1,051.30	405.91	802,374	816,684	11,448	1.43	Cincinnati

76	Snohomish	Washington	5,406.01	2,087.27	713,335	814,901	88,298	12.38	Everett

77	Multnomah	Oregon	1,117.05	431.30	735,334	811,880	72,221	9.82	Portland

78	Suffolk	Massachusetts	150.62	58.15	722,023	807,252	75,916	10.51	Boston

79	Essex	New Jersey	326.89	126.21	783,969	799,767	24,316	3.10	Newark

80	Oklahoma	Oklahoma	1,835.83	708.82	718,633	792,582	69,325	9.65	Oklahoma City

81	Essex	Massachusetts	1,275.73	492.56	743,159	790,638	42,046	5.66	Salem and Lawrence

82	Fort Bend	Texas	2,292	885	585,375	787,858	179,453	30.66	Richmond

83	Jefferson	Kentucky	985.27	380.42	741,096	770,517	30,062	4.06	Louisville

84	San Mateo	California	1,161.37	448.41	718,451	769,545	52,959	7.37	Redwood City

85	Cobb	Georgia	879.43	339.55	688,078	756,865	67,676	9.84	Marietta

86	DeKalb	Georgia	693.03	267.58	691,893	756,558	61,360	8.87	Decatur

87	Lee	Florida	2,031.88	784.51	618,754	754,610	120,470	19.47	Fort Myers

88	San Joaquin	California	3,603.51	1,391.32	685,306	752,660	60,118	8.77	Stockton

89	Monroe	New York	1,702.15	657.21	744,344	742,474	3,298	0.44	Rochester

90	Denver	Colorado	401.36	154.97	600,158	716,492	104,463	17.41	Denver

91	El Paso	Colorado	5,508.39	2,126.80	622,263	713,856	76,969	12.37	Colorado Springs

92	Polk	Florida	5,208	2,011	602,095	708,009	84,388	14.02	Bartow

93	Norfolk	Massachusetts	1,025.91	396.11	670,850	705,388	29,472	4.39	Dedham

94	Washington, D.C.	177.0	68.34	601,723	702,455	92,249	15.33	N/A

95	Lake	Illinois	1,149.10	443.67	703,462	700,832	58	0.01	Waukegan

96	Jackson	Missouri	1,565.55	604.46	674,158	700,307	24,737	3.67	Independence and Kansas City

97	Davidson	Tennessee	1,305.44	504.03	626,681	692,587	64,562	10.30	Nashville

98	Will	Illinois	2,167.58	836.91	677,560	692,310	15,101	2.23	Joliet

99	Bernalillo	New Mexico	3,006.53	1,160.83	662,564	678,701	14,209	2.14	Albuquerque

100	Hudson	New Jersey	119.63	46.19	634,266	676,061	57,377	9.05	Jersey City

Rank	County	State	Land area (km2)	Land area (mi2)	April 1, 2010 census	July 1, 2018 official estimate	Mid-2010 to mid-2018 change (absolute)	Mid-2010 to mid-2018 change (%)	County seat

Sentence(s)

As of the 2010 census, the population of Riverside County was 2,189,641, making it the 4th-most populous county in California in the United States.

final_sentence: As of the 2010 census, the population of Riverside County was 2,189,641, making it the 4th-most populous county in California in the United States.