largest us counties

Largest U.S. Counties

Study the 60-record USGuess county bank sorted by Census 2025 population estimates. This is a population-sorted quiz reference, not a complete national ranking of every U.S. county.

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county bank

60 records

Metro 40

Regional 20

All 60

largest in bank

Los Angeles County

9,694,934 residents in the Census 2025 estimate.

state spread

31 states

Northeast 9

South 23

Midwest 10

West 18

population concentration

High-population states in the bank

These cards total only the counties currently in the USGuess county quiz bank. They are useful study groupings, not statewide population totals.

7 countyies

California

23.8M

5 countyies

Texas

13.5M

5 countyies

New York

9.6M

5 countyies

Florida

9.0M

2 countyies

Arizona

5.8M

1 county

Illinois

5.2M

3 countyies

Ohio

3.4M

2 countyies

Nevada

2.9M

county study list

Population-sorted launch reference

The rank column is the order inside the current USGuess county bank. It should not be read as a national Census rank across all U.S. counties.

Bank Rank County State 2025 Estimate Seat Type Level Region

1 Los Angeles County California 9,694,934 Los Angeles Metro core Starter West

2 Cook County Illinois 5,194,625 Chicago Metro core Starter Midwest

3 Harris County Texas 5,045,026 Houston Metro core Starter South

4 Maricopa County Arizona 4,689,558 Phoenix Metro core Starter West

5 San Diego County California 3,282,248 San Diego Metro core Starter West

6 Orange County California 3,149,507 Santa Ana Metro core Standard West

7 Miami-Dade County Florida 2,802,029 Miami Metro core Starter South

8 Dallas County Texas 2,661,397 Dallas Metro core Starter South

9 Kings County New York 2,653,963 Brooklyn Metro core Standard Northeast

10 Riverside County California 2,544,916 Riverside Metro core Standard West

11 Clark County Nevada 2,407,226 Las Vegas Metro core Starter West

12 Queens County New York 2,358,182 Queens Metro core Standard Northeast

13 King County Washington 2,344,939 Seattle Metro core Starter West

14 Tarrant County Texas 2,248,466 Fort Worth Metro core Standard South

15 Bexar County Texas 2,160,088 San Antonio Metro core Starter South

16 Broward County Florida 2,013,317 Fort Lauderdale Metro core Standard South

17 Santa Clara County California 1,914,391 San Jose Metro core Standard West

18 Wayne County Michigan 1,769,038 Detroit Metro core Standard Midwest

19 Middlesex County Massachusetts 1,669,979 Cambridge Metro core Challenge Northeast

20 New York County New York 1,664,862 Manhattan Metro core Starter Northeast

21 Alameda County California 1,636,630 Oakland Metro core Standard West

22 Sacramento County California 1,618,460 Sacramento Metro core Standard West

23 Palm Beach County Florida 1,575,726 West Palm Beach Metro core Challenge South

24 Philadelphia County Pennsylvania 1,574,281 Philadelphia Metro core Starter Northeast

25 Hillsborough County Florida 1,574,115 Tampa Metro core Standard South

26 Suffolk County New York 1,546,090 Riverhead Metro core Challenge Northeast

27 Bronx County New York 1,406,332 The Bronx Metro core Challenge Northeast

28 Travis County Texas 1,389,670 Austin Metro core Starter South

29 Franklin County Ohio 1,361,536 Columbus Metro core Starter Midwest

30 Hennepin County Minnesota 1,284,784 Minneapolis Metro core Standard Midwest

31 Wake County North Carolina 1,257,235 Raleigh Metro core Standard South

32 Mecklenburg County North Carolina 1,233,383 Charlotte Metro core Starter South

33 Cuyahoga County Ohio 1,232,925 Cleveland Metro core Standard Midwest

34 Allegheny County Pennsylvania 1,225,035 Pittsburgh Regional anchor Standard Northeast

35 Salt Lake County Utah 1,220,916 Salt Lake City Regional anchor Standard West

36 Fairfax County Virginia 1,167,873 Fairfax Metro core Challenge South

37 Fulton County Georgia 1,098,791 Atlanta Metro core Starter South

38 Pima County Arizona 1,074,685 Tucson Metro core Standard West

39 Montgomery County Maryland 1,074,582 Rockville Metro core Challenge South

40 Duval County Florida 1,062,963 Jacksonville Metro core Standard South

41 Prince George's County Maryland 970,374 Upper Marlboro Metro core Challenge South

42 Milwaukee County Wisconsin 924,216 Milwaukee Regional anchor Standard Midwest

43 Shelby County Tennessee 910,226 Memphis Regional anchor Standard South

44 Essex County New Jersey 896,379 Newark Metro core Challenge Northeast

45 Hamilton County Ohio 838,418 Cincinnati Regional anchor Standard Midwest

46 Oklahoma County Oklahoma 822,125 Oklahoma City Regional anchor Standard South

47 Multnomah County Oregon 795,391 Portland Regional anchor Standard West

48 Jefferson County Kentucky 795,222 Louisville Regional anchor Standard South

49 Davidson County Tennessee 745,904 Nashville Regional anchor Starter South

50 Denver County Colorado 740,613 Denver Regional anchor Starter West

51 Tulsa County Oklahoma 698,782 Tulsa Regional anchor Standard South

52 Bernalillo County New Mexico 667,601 Albuquerque Regional anchor Standard West

53 Douglas County Nebraska 606,460 Omaha Regional anchor Standard Midwest

54 Dane County Wisconsin 590,375 Madison Regional anchor Standard Midwest

55 Spokane County Washington 558,344 Spokane Regional anchor Challenge West

56 Ada County Idaho 546,141 Boise Regional anchor Standard West

57 Polk County Iowa 516,546 Des Moines Regional anchor Standard Midwest

58 Washoe County Nevada 509,386 Reno Regional anchor Challenge West

59 Pulaski County Arkansas 404,611 Little Rock Regional anchor Standard South

60 Orleans Parish Louisiana 362,154 New Orleans Regional anchor Standard South

source checks

Population source made explicit

County records now use the `us-census-county-population-estimates` source group for population fields, while quiz map points remain county-seat learning points.

Census County Population Totals

Primary source page for county population estimates used to sort the study bank.

CO-EST2025 CSV

Official county totals file; USGuess uses the POPESTIMATE2025 field.

Census Gazetteer

Reference hub for Census geography and coordinate checks used with county-seat learning points.

source and asset policy

No county boundary shapes

County records are a manually reviewed launch seed checked against Census county population estimates, Census/Gazetteer references, public county-seat facts, and coordinate checks.

USGuess does not use county boundary geometry, official seals, copied government artwork, map screenshots, or third-party county maps as quiz material.

Census 2025 county estimates