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Most Populous U.S. Counties Quiz

Name the counties of U.S. states that have the largest populations.
2017 U.S. Census estimates
Last updated: September 10, 2018
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State
Population
County
California
10,163,507
Los Angeles
Illinois
5,211,263
Cook
Texas
4,652,980
Harris
Arizona
4,307,033
Maricopa
California
3,337,685
San Diego
California
3,190,400
Orange
Florida
2,751,796
Miami-Dade
New York
2,648,771
Kings
Texas
2,618,148
Dallas
California
2,423,266
Riverside
New York
2,358,582
Queens
Nevada
2,204,079
Clark
Washington
2,188,649
King
California
2,157,404
San Bernardino
Texas
2,054,475
Tarrant
Texas
1,958,578
Bexar
California
1,938,153
Santa Clara
Florida
1,935,878
Broward
Michigan
1,753,616
Wayne
New York
1,664,727
New York
California
1,663,190
Alameda
Massachusetts
1,602,947
Middlesex
Pennsylvania
1,580,863
Philadelphia
California
1,530,615
Sacramento
New York
1,492,953
Suffolk
State
Population
County
New York
1,471,160
Bronx
Florida
1,471,150
Palm Beach
Florida
1,408,566
Hillsborough
New York
1,369,514
Nassau
Florida
1,348,975
Orange
Ohio
1,291,981
Franklin
Minnesota
1,252,024
Hennepin
Michigan
1,250,836
Oakland
Ohio
1,248,514
Cuyahoga
Texas
1,226,698
Travis
Pennsylvania
1,223,048
Allegheny
Virginia
1,148,433
Fairfax
California
1,147,439
Contra Costa
Utah
1,135,649
Salt Lake
North Carolina
1,076,837
Mecklenburg
North Carolina
1,072,203
Wake
Maryland
1,058,810
Montgomery
Georgia
1,041,423
Fulton
Arizona
1,022,769
Pima
Missouri
996,726
St. Louis
California
989,255
Fresno
Hawaii
988,650
Honolulu
New York
980,244
Westchester
Florida
970,637
Pinellas
Texas
969,603
Collin
+3
level 75
Jan 23, 2012
How many people typed Kings for Brooklyn, got Seattle's King instead, and never went back to Brooklyn? Guilty!!
+3
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.
+1
level 67
Jul 6, 2018
That is interesting.
+1
level 67
Jul 6, 2018
Seriously, I'm the only one in 6 years?
+1
level 48
Aug 10, 2013
I did that.
+1
level 71
Jun 30, 2014
... and some of us (eg me) typed in King for Seattle and didn't expect NYC to have one too.
+1
level 82
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.
+1
level 75
May 21, 2018
Are you saying Kings County, NY isn't a borough? It's the county that Brooklyn is coterminous with!
+2
level 77
Sep 29, 2018
Just try typing in "Kings" on a "Name the Five Boroughs" quiz and see what happens ;)
+1
level 26
Apr 28, 2015
yep
+1
level 75
Sep 29, 2018
I did that.
+1
level 68
Sep 21, 2014
DuPage county in Illinois has nearly one million, if not more
+1
level ∞
Jan 28, 2015
Stop trying to discredit our American census bureau Kim!
+1
level 68
Mar 3, 2015
Don't call me Kim, I'm not Kim! Why would I have this username if I were him...
+1
level 71
May 22, 2018
KIm, I'd probably call myself who I am, otherwise people will just call me Kim.
+1
level 69
Sep 29, 2018
Thinking of Ray Jay Johnson Jr. Anyone remember him?
+1
level 75
Sep 29, 2018
You can call me Ray, you can call me Jay...
+1
level 18
Jun 3, 2015
Hey Kim, how you doing these days?
+1
level 71
Jan 29, 2015
Isn't Fairfax County in Virginia? I don't recall there being a Fairfax County in Maryland. It's Prince George's and Montgomery County that borders DC on the Maryland side.
+1
level ∞
Jan 29, 2015
Fixed
+1
level 75
Apr 27, 2015
Comparing the "QuickFacts" from the US Census and Wikipedia, it looks like the Fairfax County number includes Fairfax (city), which is technically incorrect. Larger cites in Virginia, of which Fairfax City is an example, are independent, and for most purposes are considered county equivalents.
+1
level 71
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.
+1
level ∞
May 19, 2018
They do publish certainty estimates as well if you care.
+1
level 71
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?
+1
level 64
Apr 27, 2015
Oof, this quiz kicked my ass. I'm gonna have to bone up on this.
+1
level 18
Jun 3, 2015
I tried Loving (spelling) county. It just wouldn't accept it! I mean...I tried luving, loving, luveeng, loveng, etc. but nothing.
+1
level 22
Oct 14, 2015
I kept trying Queen, Queen, Queen! Yet the whole time I only needed to add an S.
+1
level 69
Sep 6, 2016
I think primary season has drastically enhanced my knowledge of US counties, with most results being reported by county.
+1
level 75
Sep 29, 2018
Same here. "Waiting for the returns from..."