Clayton, IN -- U.S. town in Indiana Population (2000): 693 Housing Units (2000): 270 Land area (2000): 0.496874 sq. miles (1.286897 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.496874 sq. miles (1.286897 sq. km) FIPS code: 13366 Located within: Indiana (IN), FIPS 18 Location: 39.689427 N, 86.522752 W ZIP Codes (1990): 46118 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Clayton, IN Clayton