There are two counties in the United States known as Hillsborough. Hillsborough County, Florida covers a total area of 1,266.22 square miles (3,279 square kilometers); and Hillsborough County, New Hampshire covers a total area of 892 square miles (2,310 square kilometers).
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The largest County in Maine is Aroostook, measuring 6,829 square miles.
Putnam County, Florida has a total area of 827 square miles.
Approx 20105 square miles.
Harney County, OR is 10,226 sq miles (26,485 km²).
Idaho County is 8,502 sq miles (22,020 km²).