Most Densely Populated Counties in the U.S.

Name the 40 most densely populated counties in the United States.
Density per square mile.
According to the 2020 census
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FNWY4life
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Last updated: October 19, 2025
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First submittedOctober 19, 2025
Times taken20
Average score52.5%
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Density
 
County
69,468
NY
New York
35,369
NY
Kings
32,903
NY
Bronx
20,554
NY
Queens
17,179
CA
San Francisco
13,732
NJ
Hudson
12,417
MA
Suffolk
11,379
PA
Philadelphia
9,314
VA
Alexandria
8,853
VA
Arlington
8,030
NY
Richmond
7,672
MD
Baltimore
6,212
NJ
Essex
6,170
VA
Falls Church
5,633
VA
Manassas Park
5,495
IL
Cook
5,216
NJ
Union
5,157
MO
St. Louis
4,705
NY
Nassau
4,486
VA
Norfolk
4,242
VA
Charlottesville
3,926
WI
Milwaukee
3,923
CO
Denver
3,884
NJ
Bergen
3,828
VA
Manassas
3,808
CA
Orange
3,617
VA
Fairfax
3,415
VA
Richmond
3,348
FL
Pinellas
3,342
MN
Ramsey
3,039
PA
Delaware
2,974
MI
Wayne
2,839
VA
Portsmouth
2,838
VA
Winchester
2,820
VA
Lexington
2,808
VA
Harrisonburg
2,800
OH
Cuyahoga
2,800
IL
DuPage
2,767
VA
Fairfax
2,718
TX
Dallas
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