Most Densely Populated US Counties

Can you name the 25 most densely populated county and county-equivalents in the United States?
Not including Municipalities of Puerto Rico
Hint: some cities are independent of their counties. They ARE included in this quiz
Source: en.wikipedia.org/wiki/County_statistics_of_the_United_States
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jumpingsequoia
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Last updated: August 6, 2025
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First submittedAugust 6, 2025
Times taken29
Average score72.0%
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Answer
State
69,468 / sq mi
New York County
NY
35,369 / sq mi
Kings County
NY
30,903 / sq mi
Bronx County
NY
20,554 / sq mi
Queens County
NY
17,179 / sq mi
San Francisco County
CA
13,732 / sq mi
Hudson County
NJ
12,417 / sq mi
Suffolk County
MA
11,379 / sq mi
Philadelphia County
PA
9,857 / sq mi
Washington DC
DC
9,314 / sq mi
Alexandria
VA
8,853 / sq mi
Arlington County
VA
8,030 / sq mi
Richmond County
NY
7,672 / sq mi
City of Baltimore
MD
6,262 / sq mi
Essex County
NJ
6,170 / sq mi
Falls Church
VA
5,633 / sq mi
Manassas Park
VA
5,495 / sq mi
Cook County
IL
5,216 / sq mi
Union County
NJ
5,175 / sq mi
City of St. Louis
MO
4,705 / sq mi
Nassau County
NY
4,486 / sq mi
Norfolk
VA
4,242 / sq mi
Charlottesville
VA
3,926 / sq mi
Milwaukee County
WI
3,923 / sq mi
Denver County
CO
3,900 / sq mi
Bergen County
NJ
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