DeKalb -- U.S. County in Indiana Population (2000): 40285 Housing Units (2000): 16144 Land area (2000): 362.878007 sq. miles (939.849684 sq. km) Water area (2000): 0.965691 sq. miles (2.501129 sq. km) Total area (2000): 363.843698 sq. miles (942.350813 sq. km) Located within: Indiana (IN), FIPS 18 Location: 41.388868 N, 85.017127 W Headwords: DeKalb DeKalb, IN DeKalb County DeKalb County, IN