5,315 sq miles (13,766 km²).
As of the 2010 census, the population in Okanogan County was 41,120. Okanogan County has total area of 5,315 square miles.
Washington DC is the capital city of the US. It does not have countries or cities.
5,268 sq mi
Osage County is the largest county in Oklahoma, measuring approximately 2,304 square miles.
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The largest County in Maine is Aroostook, measuring 6,829 square miles.
Pike County.
San Bernardino County is the largest county in California, and all of the continental United States. It has 20,105 square miles.
Kossuth County is the largest county in Iowa by land area, covering approximately 973 square miles.
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Hawaii County is 5,087 sq miles (13,175 km²).
Shelby County's total area is 785 square miles including 763 square miles of land area. Shelby County is Tennessee's largest county in area.