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Largest counties in the US

Los Angeles County, California, is the largest US county by population, with 9,663,345 people in 2023. Next come Cook County, Illinois; Harris County, Texas; Maricopa County, Arizona; San Diego County, California. Below are the 100 largest; type to find a county or state.

RankCountyPeople, 2023
1Los Angeles CountyCalifornia9,663,345
2Cook CountyIllinois5,087,072
3Harris CountyTexas4,835,125
4Maricopa CountyArizona4,585,871
5San Diego CountyCalifornia3,269,973
6Orange CountyCalifornia3,135,755
7Miami-Dade CountyFlorida2,686,867
8Dallas CountyTexas2,606,358
9Kings CountyNew York2,561,225
10Riverside CountyCalifornia2,492,442
11Clark CountyNevada2,336,573
12King CountyWashington2,271,380
13Queens CountyNew York2,252,196
14San Bernardino CountyCalifornia2,195,611
15Tarrant CountyTexas2,182,947
16Bexar CountyTexas2,087,679
17Broward CountyFlorida1,962,531
18Santa Clara CountyCalifornia1,877,592
19Wayne CountyMichigan1,751,169
20Middlesex CountyMassachusetts1,623,952
21Alameda CountyCalifornia1,622,188
22New York CountyNew York1,597,451
23Sacramento CountyCalifornia1,584,288
24Philadelphia CountyPennsylvania1,550,542
25Hillsborough CountyFlorida1,535,564
26Palm Beach CountyFlorida1,533,801
27Suffolk CountyNew York1,523,170
28Orange CountyFlorida1,471,416
29Nassau CountyNew York1,381,715
30Bronx CountyNew York1,356,476
31Travis CountyTexas1,334,961
32Franklin CountyOhio1,326,063
33Oakland CountyMichigan1,270,426
34Hennepin CountyMinnesota1,258,713
35Cuyahoga CountyOhio1,233,088
36Allegheny CountyPennsylvania1,224,825
37Collin CountyTexas1,195,359
38Wake CountyNorth Carolina1,190,275
39Salt Lake CountyUtah1,185,813
40Mecklenburg CountyNorth Carolina1,163,701
41Contra Costa CountyCalifornia1,155,025
42Fairfax CountyVirginia1,141,878
43Fulton CountyGeorgia1,079,105
44Pima CountyArizona1,063,162
45Montgomery CountyMaryland1,058,474
46Duval CountyFlorida1,030,822
47Fresno CountyCalifornia1,017,162
48Denton CountyTexas1,007,703
49Westchester CountyNew York990,817
50Honolulu CountyHawaii989,408
51St. Louis CountyMissouri987,059
52Gwinnett CountyGeorgia983,526
53Capitol Planning RegionConnecticut975,328
54Marion CountyIndiana968,460
55Pinellas CountyFlorida961,596
56Bergen CountyNew Jersey957,736
57Prince George's CountyMaryland947,430
58Erie CountyNew York946,147
59Pierce CountyWashington928,696
60DuPage CountyIllinois921,213
61Fort Bend CountyTexas916,778
62Milwaukee CountyWisconsin916,205
63Kern CountyCalifornia913,820
64Shelby CountyTennessee910,042
65Hidalgo CountyTexas898,471
66Macomb CountyMichigan875,101
67El Paso CountyTexas869,880
68Montgomery CountyPennsylvania868,742
69Worcester CountyMassachusetts866,866
70Middlesex CountyNew Jersey863,623
71Essex CountyNew Jersey851,117
72Snohomish CountyWashington844,761
73Baltimore CountyMaryland844,703
74Lee CountyFlorida834,573
75Ventura CountyCalifornia829,590
76Hamilton CountyOhio827,058
77Polk CountyFlorida818,330
78Essex CountyMassachusetts810,089
79San Francisco CountyCalifornia808,988
80Oklahoma CountyOklahoma808,866
81San Joaquin CountyCalifornia800,965
82Multnomah CountyOregon789,698
83Cobb CountyGeorgia776,743
84Jefferson CountyKentucky772,144
85Suffolk CountyMassachusetts768,425
86DeKalb CountyGeorgia762,992
87Monroe CountyNew York748,482
88El Paso CountyColorado744,215
89Norfolk CountyMassachusetts727,473
90San Mateo CountyCalifornia726,353
91Utah CountyUtah719,174
92Jackson CountyMissouri718,560
93Denver CountyColorado716,577
94Davidson CountyTennessee712,334
95Montgomery CountyTexas711,354
96Lake CountyIllinois708,760
97Hudson CountyNew Jersey705,472
98Will CountyIllinois700,728
99Williamson CountyTexas697,191
100Tulsa CountyOklahoma682,868

Largest by land area

  1. Yukon-Koyukuk Census Area, Alaska: 145,582 sq mi
  2. North Slope Borough, Alaska: 88,824 sq mi
  3. Bethel Census Area, Alaska: 40,639 sq mi
  4. Northwest Arctic Borough, Alaska: 35,663 sq mi
  5. Southeast Fairbanks Census Area, Alaska: 24,832 sq mi
  6. Matanuska-Susitna Borough, Alaska: 24,707 sq mi
  7. Copper River Census Area, Alaska: 24,692 sq mi
  8. Lake and Peninsula Borough, Alaska: 23,832 sq mi
  9. Nome Census Area, Alaska: 22,970 sq mi
  10. San Bernardino County, California: 20,068 sq mi

Questions

What is the largest county in the US by population?

Los Angeles County, California, with 9,663,345 people in 2023.

What is the largest county in the US by land area?

Yukon-Koyukuk Census Area, Alaska, with 145,582 square miles of land. Outside Alaska it is San Bernardino County, California, with 20,068 square miles.

How many US counties have a million or more people?

48, in the 2023 estimates.

How many people does the 100th-largest county have?

Tulsa County, Oklahoma, ranks 100th with 682,868 people.

Numbers are the US Census Bureau's 2023 population estimates and 2023 county list, which are public domain.

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