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Most Populous County In Each U.S. State

Name the most populous county for each state in the US. No yellow box, so you can go wild with guesses. Alaska has no counties. Louisiana (included) has parishes.
Population according to 2024 U.S. Census estimates
Quiz by
mightythor
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Last updated: November 14, 2025
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First submittedJune 7, 2020
Times taken5,137
Average score30.6%
Rating4.49
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State
County
Population
Alabama
Jefferson
664,744
Arizona
Maricopa
4,673,096
Arkansas
Pulaski
401,209
California
Los Angeles
9,757,179
Colorado
El Paso
752,772
Connecticut
Fairfield
977,685
Delaware
New Castle
588,093
Florida
Miami-Dade
2,838,461
Georgia
Fulton
1,090,354
Hawaii
Honolulu
998,747
Idaho
Ada
535,799
Illinois
Cook
5,182,617
Indiana
Marion
981,628
Iowa
Polk
516,185
Kansas
Johnson
632,276
Kentucky
Jefferson
793,881
Louisiana
East Baton Rouge
453,022
Maine
Cumberland
313,809
Maryland
Montgomery
1,082,273
Massachusetts
Middlesex
1,668,956
Michigan
Wayne
1,771,063
Minnesota
Hennepin
1,273,334
Mississippi
Harrison
213,730
Missouri
St. Louis
992,929
Montana
Yellowstone
171,583
State
County
Population
Nebraska
Douglas
601,158
Nevada
Clark
2,398,871
New Hampshire
Hillsborough
430,462
New Jersey
Bergen
978,641
New Mexico
Bernalillo
671,747
New York
Kings
2,617,631
North Carolina
Wake
1,232,444
North Dakota
Cass
200,945
Ohio
Franklin
1,356,303
Oklahoma
Oklahoma
816,490
Oregon
Multnomah
795,897
Pennsylvania
Philadelphia
1,573,916
Rhode Island
Providence
675,912
South Carolina
Greenville
570,745
South Dakota
Minnehaha
208,639
Tennessee
Shelby
910,530
Texas
Harris
5,009,302
Utah
Salt Lake
1,216,274
Vermont
Chittenden
170,851
Virginia
Fairfax
1,160,925
Washington
King
2,340,211
West Virginia
Kanawha
173,906
Wisconsin
Milwaukee
924,740
Wyoming
Laramie
101,783
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20 Comments
ChineseChen
+4
Level 70
Jun 9, 2020
But Alaska has boroughs
mightythor
+3
Level 68
Jun 9, 2020
It does!

I decided to leave that out, because I didn't want to either

include boros from other states or

make an exception for Alaska

Also, I think of boros as subdivisions of counties; and below cities in the hierarchy of political subdivisions.

Feel free to try to poke holes in my position. It does feel strange to leave Alaska out.

FreeStater
+11
Level 79
Nov 14, 2025
Alaska's boroughs are just her version of counties with a new name and slightly different power structure. If you're going to include Louisiana, it only makes sense to do the same with Alaska.
Grasshopper13
+1
Level 27
Jan 14, 2026
But you include the Burroughs of New York which are each tied to a county.
GeographyGeek42
+3
Level 65
Jun 13, 2020
84%. failed to remember NJ, MS, AR, NM, SC (somehow), NE, MT, and ND.
TheQuizzler
+3
Level 64
Jun 15, 2020
Great quiz!
TheRealGrantma
+4
Level 55
Sep 6, 2020
ayy my county is here!
FreeStater
+1
Level 79
Nov 14, 2025
As is mine. :)
TheRealGrantma
+6
Level 55
Sep 6, 2020
I would suggest using Alaska's boroughs as they are county equivalents.
Angbo
+1
Level 66
Jun 4, 2021
First,El Paso county is the MOST populous county in Colorado.

Second,you should add Anchorage and Alaska in your quiz.

ooftownroad
+1
Level 67
Feb 25, 2025
El Paso county is bigger than Denver
Quizmaster
+1
Level ∞
Nov 14, 2025
Updated with 2024 population totals.
loganite
+2
Level 93
Nov 14, 2025
So if you live in OKC, you live in Oklahoma, Oklahoma, Oklahoma?! They really went all in on that name! ;)
Jeremy
+3
Level 78
Nov 14, 2025
There’s also an Oklahoma Avenue in OKC, on which is the University of Central Oklahoma. 5 layers!
FreeStater
+2
Level 79
Dec 23, 2025
You can stand at the intersection of Oklahoma and Oklahoma City while viewing the Oklahoma River in Oklahoma City, Oklahoma County, Oklahoma.
Shadywyvern
+2
Level 85
Nov 14, 2025
So happy to see this featured! You may want to change the picture on the quiz as it shows a lot of the counties which would be answers.
Quizmaster
+1
Level ∞
Nov 14, 2025
Replaced the thumbnail.
milapuppy
+2
Level 23
Nov 14, 2025
my guy just add alaska FLS man, even though everyone knows its anchorage dont be lame and add it please
EthanEllis
+1
Level 46
Jan 13, 2026
Connecticut replaced their counties with planning regions, now making Capitol (Hartford) the most populous.
Grasshopper13
+1
Level 27
Jan 14, 2026
Alaska may not have counties but it has an equivalent, Burroughs although is also has a large area that is unincorporated with any mid level. Supposedly much of new England only has counties on paper.
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