Thorntown, IN -- U.S. town in Indiana Population (2000): 1562 Housing Units (2000): 632 Land area (2000): 0.570881 sq. miles (1.478576 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.570881 sq. miles (1.478576 sq. km) FIPS code: 75626 Located within: Indiana (IN), FIPS 18 Location: 40.128757 N, 86.608762 W ZIP Codes (1990): 46071 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Thorntown, IN Thorntown