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Largest County-Equivalents in the US

Name the 10 largest county-equivalents (counties; Alaska, Maryland, Missouri, Nevada, and Virginia county-level cities; Louisiana parishes; Connecticut planning regions; and Alaska boroughs and census areas) by population and area, respectively
The boroughs of New York City roughly correspond to counties, but you'll need to give the county name if applicable
Updated at most every decennial Census or change in administrative division
Since adding km^2 conversions would make the chart bulky: 145k mi^2 is about the land area of Bangladesh or Montana. 20k mi^2 is about the area of Slovenia or West Virginia.
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CLD99
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Last updated: February 16, 2026
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First submittedFebruary 16, 2026
Times taken16
Average score60.0%
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Population
County
9,721,138
Los Angeles
5,109,292
Cook
4,780,913
Harris
4,551,524
Maricopa
3,276,208
San Diego
3,151,184
Orange
2,673,837
Miami-Dade
2,600,840
Dallas
2,590,516
Kings
2,473,902
Riverside
mi^2
County
145,576
Yukon-Koyukuk
88,824
North Slope
40,627
Bethel
35,663
Northwest Arctic
24,831
Southeast Fairbanks
24,707
Matanuska-Susitna
24,692
Copper River
23,832
Lake and Peninsula
22,969
Nome
20,062
San Bernardino
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