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Most Populous U.S. Counties

Try to name the counties of U.S. states which have the largest populations.
Population as of 1 July 2022 according to U.S. Census estimates
Quiz by Quizmaster
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Last updated: April 27, 2023
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First submittedJanuary 23, 2012
Times taken21,966
Average score34.0%
Rating4.08
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State
Population
County
California
9,721,138
Los Angeles
Illinois
5,109,292
Cook
Texas
4,780,913
Harris
Arizona
4,551,524
Maricopa
California
3,276,208
San Diego
California
3,151,184
Orange
Florida
2,673,837
Miami-Dade
Texas
2,600,840
Dallas
New York
2,590,516
Kings
California
2,473,902
Riverside
Nevada
2,322,985
Clark
New York
2,278,029
Queens
Washington
2,266,789
King
California
2,193,656
San Bernardino
Texas
2,154,595
Tarrant
Texas
2,059,530
Bexar
Florida
1,947,026
Broward
California
1,870,945
Santa Clara
Michigan
1,757,043
Wayne
California
1,628,997
Alameda
Massachusetts
1,617,105
Middlesex
New York
1,596,273
New York
California
1,584,169
Sacramento
Pennsylvania
1,567,258
Philadelphia
New York
1,525,465
Suffolk
State
Population
County
Florida
1,518,477
Palm Beach
Florida
1,513,301
Hillsborough
Florida
1,452,726
Orange
New York
1,383,726
Nassau
New York
1,379,946
Bronx
Texas
1,326,436
Travis
Ohio
1,321,820
Franklin
Michigan
1,269,431
Oakland
Minnesota
1,260,121
Hennepin
Ohio
1,236,041
Cuyahoga
Pennsylvania
1,233,253
Allegheny
Utah
1,186,257
Salt Lake
North Carolina
1,175,021
Wake
Texas
1,236,041
Collin
California
1,233,253
Contra Costa
North Carolina
1,186,257
Mecklenburg
Virginia
1,175,021
Fairfax
Georgia
1,074,634
Fulton
Arizona
1,057,597
Pima
Maryland
1,052,521
Montgomery
Florida
1,016,536
Duval
California
1,015,190
Fresno
Hawaii
995,638
Honolulu
New York
990,427
Westchester
Missouri
990,414
St. Louis
+13
Level 77
Jan 23, 2012
How many people typed Kings for Brooklyn, got Seattle's King instead, and never went back to Brooklyn? Guilty!!
+14
Level ∞
Jan 23, 2012
Interesting fact. Seattle's King county was once named after a guy who many people considered to be a jerk. A few years back they "renamed" the county after Martin Luther King, Jr.
+3
Level 89
Jul 6, 2018
That is interesting.
+3
Level 89
Jul 6, 2018
Seriously, I'm the only one in 6 years?
+10
Level 89
Jun 13, 2020
Only one who what? Commented directly to the Quizmaster? Why is that important?
+1
Level 67
Apr 30, 2023
I always thought it was named after the fish.
+2
Level 54
Aug 10, 2013
I did that.
+2
Level 76
Jun 30, 2014
... and some of us (eg me) typed in King for Seattle and didn't expect NYC to have one too.
+2
Level 92
Jan 28, 2015
The stats seem to bear that out. King, Queens and the Bronx are all right there together (King slightly higher for those who know Seattle), but Kings 10% lower than the Bronx. Could also be because Kings isn't one of the Boroughs, and thus slightly less known, but that's why I missed it.
+2
Level 85
May 21, 2018
Are you saying Kings County, NY isn't a borough? It's the county that Brooklyn is coterminous with!
+6
Level 86
Sep 29, 2018
Just try typing in "Kings" on a "Name the Five Boroughs" quiz and see what happens ;)
+2
Level 23
Apr 28, 2015
yep
+2
Level 75
Sep 29, 2018
I did that.
+2
Level 73
Jun 13, 2020
I did too. I didn't think to go back because sometimes these quizzes fill in the answer without typing the "s".
+3
Level 74
Sep 21, 2014
DuPage county in Illinois has nearly one million, if not more
+8
Level ∞
Jan 28, 2015
Stop trying to discredit our American census bureau Kim!
+5
Level 74
Mar 3, 2015
Don't call me Kim, I'm not Kim! Why would I have this username if I were him...
+2
Level 76
May 22, 2018
KIm, I'd probably call myself who I am, otherwise people will just call me Kim.
+3
Level 66
Sep 29, 2018
Thinking of Ray Jay Johnson Jr. Anyone remember him?
+2
Level 75
Sep 29, 2018
You can call me Ray, you can call me Jay...
+2
Level 71
Jun 13, 2020
You can call me Ray, you can call me Jay, just don't call me too early in the day!
+3
Level 76
Apr 26, 2015
One detail, from someone who has worked as a census counter: The final figure is only accurate to within about 1%, ie 10,000 people per million - your quota is to reach over 95% of each subdistrict, after which it's not cost-effective to keep knocking on doors, and extrapolation happens after that. So when you see numbers like 10,017,368 for LA county, that figure is actually plus or minus 100,000! It's bloody ridiculous for countries' statistics departments to announce numbers to the last digit, faking an accuracy that doesn't exist.
+2
Level ∞
May 19, 2018
They do publish certainty estimates as well if you care.
+2
Level 76
May 21, 2018
I just spent a while trawling through the census.gov website for this, and couldn't find anything - do you have the link to the certainty estimates?
+2
Level ∞
Apr 18, 2020
Can't find them for counties right now. Probably have to use the API, which they are always mucking with. I know they exist though.
+4
Level 62
Apr 27, 2015
Oof, this quiz kicked my ass. I'm gonna have to bone up on this.
+3
Level 20
Oct 14, 2015
I kept trying Queen, Queen, Queen! Yet the whole time I only needed to add an S.
+3
Level 82
Sep 6, 2016
I think primary season has drastically enhanced my knowledge of US counties, with most results being reported by county.
+3
Level 75
Sep 29, 2018
Same here. "Waiting for the returns from..."
+2
Level 56
May 13, 2020
Yay my county is here!
+3
Level 66
Jun 13, 2020
+5
Level 62
Jun 13, 2020
OK not being American really held me back here, I’ve never heard of most of these (unlike states and cities)
+7
Level 73
Jun 13, 2020
That's okay. Most of us haven't really heard of the counties...just the cities, which made it an interesting quiz.
+5
Level 79
Jan 28, 2021
Watching election coverage really helped me with this quiz.
+2
Level 78
Sep 22, 2021
Does it make sense to update this quiz now that 2020 census data is in? https://en.wikipedia.org/wiki/List_of_the_most_populous_counties_in_the_United_States
+1
Level 76
Nov 11, 2021
Yeah, especially since a lot of the predictions for New York's population decline turned out to be mostly wrong... just for example, Kings County actually has more people than Dallas County and Miami-Dade.

And as you get closer to the bottom of the list, the numbers needed to move places gets tigher and knocks a few off the list

+2
Level ∞
Apr 27, 2023
That 2020 census was based on April 1, 2020 data so it really didn't take into account Covid.

Unfortunately, since 2020, the population of all New York City counties has taken a nose dive. In fact, I sorted the top 50 counties by population loss as a percentage of the population. The top 4 were all New York City!

1) Bronx -6%

2) Manhattan -6%

3) Brooklyn -5%

4) Queens -5%

Biggest gainer was Collin County, Texas (+8%) which is a suburb of Dallas.

+1
Level 93
Apr 27, 2023
The amount of people leaving the big cities in the North and going to Texas and Florida is kind of mind-boggling.
+3
Level 86
Apr 28, 2023
How so? It makes perfect sense to me. Warmer weather and no state income taxes. That doesn't even take into account the increase in remote work capabilities or the other effects of lockdowns.
+1
Level 93
Nov 7, 2023
Oh their reasonings why isn't what's crazy to me, it's the sheer number of people relocating.
+2
Level 58
May 30, 2023
Bruh I actually got 49/50. Me grinding US counties finally helped. The only one I missed was Duval
+1
Level 67
May 31, 2023
Wow impressive
+1
Level 67
May 31, 2023
Montgomery represent
+1
Level 67
May 31, 2023
Managed to get 15
+1
Level 67
May 31, 2023
Funny how Fairfax is considered part of DC-Baltimore metro area for the purposes of this quiz, because realistically northern VA doesn't make sense to group with Baltimore. I like when they combine DC and Baltimore for certain quizzes it's interesting