Counties with the lowest and highest population density

Can you guess the 20 counties in the contiguous United States with the lowest and highest population density?
Figures are in people/square mile and are calculated based on information from Wikipedia's county list pages.
Independent cities and combined city-counties are considered as equivalent to counties.
Quiz by Panifex
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Last updated: March 28, 2018
First submittedMarch 28, 2018
Times taken8
Average score30.0%
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Density
High County
47,828
New York (NY)
26,723
Kings (NY)
24,890
Bronx (NY)
17,818
San Francisco (CA)
14,049
Hudson (NJ)
13,026
Suffolk (MA)
12,900
Queens (NY)
10,861
Philadelphia (PA)
9,926
City of Alexandria (VA)
9,507
District of Columbia
8,650
Arlington (VA)
6,762
City of Baltimore (MD)
6,754
City of Falls Church (VA)
6,460
City of Manassas Park (VA)
6,266
Essex (NJ)
5,540
Cook (IL)
5,323
Union (NJ)
5,134
City of Saint Louis (MO)
4,589
Richmond (NY)
4,558
City of Norfolk (VA)
Density
Low County
0.141
Loving (TX)
0.232
Esmeralda (NV)
0.276
Garfield (MT)
0.283
Kenedy (TX)
0.306
Petroleum (MT)
0.313
King (TX)
0.326
Harding (NM)
0.351
Carter (MT)
0.367
Keweenaw (MI)
0.383
Terrell (TX)
0.472
Harding (SD)
0.491
Clark (ID)
0.493
Lincoln (NV)
0.497
Eureka (NV)
0.521
Catron (NM)
0.530
Powder River (MT)
0.597
Culberson (TX)
0.612
McPherson (NE)
0.625
Slope (ND)
0.641
Arthur (NE)
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