US County Area home

Most populous counties

County equivalents ranked by the Census Bureau’s latest July 1 population estimate. Land area and density are shown alongside, because a populous county is not necessarily a dense one.

Ranks 1–100

Vintage 2025 population estimates · 2026 Gazetteer land area · 3,222 county equivalents · page 1 of 33

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What this part of the ranking shows

This page runs from Los Angeles County, California at 9,694,934 residents to Tulsa County, Oklahoma at 698,782 residents. The 100 entries represent 29 state-level jurisdictions. California has the most entries on this page (15).

Los Angeles County, California ranks first at 9,694,934 residents, followed by Cook County, Illinois at 5,194,625 residents. Compare the first two entries to see their land areas side by side.

Population estimates are revised every year. Rank changes between vintages can reflect revisions as well as real growth or decline.

Most populous counties, ranks 1 through 100. Population is the July 1, 2025 estimate; density is per square mile of land.
RankCounty / equivalentStatePopulationPer mi²Land mi²
1Los Angeles CountyCalifornia9,694,9342,3884,060.3
2Cook CountyIllinois5,194,6255,497944.9
3Harris CountyTexas5,045,0262,9551,707.3
4Maricopa CountyArizona4,689,5585109,202
5San Diego CountyCalifornia3,282,2487794,210.9
6Orange CountyCalifornia3,149,5073,970793.2
7Miami-Dade CountyFlorida2,802,0291,4751,900
8Dallas CountyTexas2,661,3973,048873.1
9Kings CountyNew York2,653,96338,25469.4
10Riverside CountyCalifornia2,544,9163537,209
11Clark CountyNevada2,407,2263057,891.7
12Queens CountyNew York2,358,18221,690108.7
13King CountyWashington2,344,9391,1082,115.8
14Tarrant CountyTexas2,248,4662,598865.4
15San Bernardino CountyCalifornia2,224,09111120,068.4
16Bexar CountyTexas2,160,0881,7411,240.5
17Broward CountyFlorida2,013,3171,6741,203
18Santa Clara CountyCalifornia1,914,3911,4831,291.1
19Wayne CountyMichigan1,769,0382,891611.8
20Middlesex CountyMassachusetts1,669,9792,042817.9
21New York CountyNew York1,664,86273,47822.7
22Alameda CountyCalifornia1,636,6302,219737.5
23Sacramento CountyCalifornia1,618,4601,677965.4
24Palm Beach CountyFlorida1,575,7268021,964.3
25Philadelphia CountyPennsylvania1,574,28111,720134.3
26Hillsborough CountyFlorida1,574,1151,5401,022.2
27Suffolk CountyNew York1,546,0901,697910.9
28Orange CountyFlorida1,528,0021,692903
29Bronx CountyNew York1,406,33233,32442.2
30Nassau CountyNew York1,398,9394,916284.5
31Travis CountyTexas1,389,6701,398994.4
32Franklin CountyOhio1,361,5362,557532.4
33Collin CountyTexas1,297,1791,541841.6
34Oakland CountyMichigan1,288,3371,485867.4
35Hennepin CountyMinnesota1,284,7842,319554
36Wake CountyNorth Carolina1,257,2351,506834.8
37Mecklenburg CountyNorth Carolina1,233,3832,355523.6
38Cuyahoga CountyOhio1,232,9252,696457.2
39Allegheny CountyPennsylvania1,225,0351,678730
40Salt Lake CountyUtah1,220,9161,622752.7
41Contra Costa CountyCalifornia1,170,0701,632716.9
42Fairfax CountyVirginia1,167,8732,987391
43Fulton CountyGeorgia1,098,7912,086526.9
44Pima CountyArizona1,074,6851179,188.7
45Montgomery CountyMaryland1,074,5822,179493.1
46Denton CountyTexas1,069,3461,218878.1
47Duval CountyFlorida1,062,9631,394762.7
48Fresno CountyCalifornia1,035,4561745,958.6
49Gwinnett CountyGeorgia1,018,0992,361431.2
50Westchester CountyNew York1,015,7432,358430.8
51Capitol Planning RegionConnecticut994,1159681,027.4
52Marion CountyIndiana992,1962,506396
53St. Louis CountyMissouri990,9111,949508.5
54Honolulu CountyHawaii988,7031,646600.8
55Bergen CountyNew Jersey977,0264,197232.8
56Fort Bend CountyTexas975,1911,131862.1
57Prince George's CountyMaryland970,3742,011482.6
58Pinellas CountyFlorida948,5633,464273.8
59Erie CountyNew York946,7419081,042.8
60Pierce CountyWashington946,2885671,668
61DuPage CountyIllinois934,2982,849327.9
62Kern CountyCalifornia927,0681148,134.7
63Milwaukee CountyWisconsin924,2163,828241.5
64Hidalgo CountyTexas921,5495871,571.2
65Shelby CountyTennessee910,2261,209752.8
66Essex CountyNew Jersey896,3797,109126.1
67Worcester CountyMassachusetts888,5025881,510.7
68Macomb CountyMichigan886,2211,849479.4
69Middlesex CountyNew Jersey883,3352,856309.3
70El Paso CountyTexas877,8588661,013.5
71Montgomery CountyPennsylvania877,6431,817482.9
72Lee CountyFlorida875,6071,121781.2
73Polk CountyFlorida874,7904861,798.8
74Snohomish CountyWashington870,6564172,086.5
75Baltimore CountyMaryland847,6501,417598.4
76Hamilton CountyOhio838,4182,068405.5
77Ventura CountyCalifornia830,8514511,840.8
78Essex CountyMassachusetts826,6531,678492.5
79San Francisco CountyCalifornia826,07917,69546.7
80San Joaquin CountyCalifornia823,8155921,392.3
81Oklahoma CountyOklahoma822,1251,160708.9
82Multnomah CountyOregon795,3911,845431
83Jefferson CountyKentucky795,2222,088380.8
84Cobb CountyGeorgia793,3452,335339.7
85Suffolk CountyMassachusetts791,89113,59358.3
86Montgomery CountyTexas781,1947501,042.2
87DeKalb CountyGeorgia774,3942,893267.6
88Utah CountyUtah759,8593792,004.5
89El Paso CountyColorado757,0403562,126.4
90Williamson CountyTexas752,8276751,115.9
91Monroe CountyNew York750,5061,142657
92Davidson CountyTennessee745,9041,481503.5
93San Mateo CountyCalifornia743,5681,658448.6
94Denver CountyColorado740,6134,838153.1
95Norfolk CountyMassachusetts739,7491,868396.1
96Hudson CountyNew Jersey735,03315,91246.2
97Jackson CountyMissouri732,9941,212604.7
98Lake CountyIllinois719,3391,621443.7
99Will CountyIllinois712,253852835.9
100Tulsa CountyOklahoma698,7821,226570.2

Read the differences behind ranks 1–100

The median population among these 100 entries is 1,004,929. The first and last entries span 8,996,152 residents. This median describes the entries on this page, not the full national dataset. Pagination is a browsing boundary, not a distinct geographic region.

Adjacent ranks can differ by a handful of residents or by many thousands. Open a county profile for its population trend since 2020, land area, and state comparisons.

Where the entries on this page are located

  • California15 entries · 15% of this page
  • Texas12 entries · 12% of this page
  • Florida9 entries · 9% of this page
  • New York9 entries · 9% of this page
  • Massachusetts5 entries · 5% of this page
  • Georgia4 entries · 4% of this page

The remaining 23 jurisdictions contribute 46 entries. The list above shows the six most represented, with alphabetical ordering when counts tie.

These counts describe representation in this slice of the ranking. They do not measure a state’s share of national land or population. Compare the first and last county equivalents on this page to inspect land, water, and total area separately.

Read the geographic explanation behind this ranking, or return to the ranking overview for the national distribution and guidance on selecting a measurement.

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Browse by state for a complete state ranking.

Population rankings use Census Bureau Vintage 2025 estimates; density rankings divide them by original ALAND square meters. Land rankings use original ALAND square meters; total-area rankings use ALAND + AWATER. Exact ties use ascending GEOID. Displayed square-mile values are rounded. Read the methodology.