Spencer -- U.S. County in Indiana Population (2000): 20391 Housing Units (2000): 8333 Land area (2000): 398.685928 sq. miles (1032.591768 sq. km) Water area (2000): 2.546198 sq. miles (6.594621 sq. km) Total area (2000): 401.232126 sq. miles (1039.186389 sq. km) Located within: Indiana (IN), FIPS 18 Location: 38.024372 N, 87.013205 W Headwords: Spencer Spencer, IN Spencer County Spencer County, IN