Oldenburg, IN -- U.S. town in Indiana Population (2000): 647 Housing Units (2000): 228 Land area (2000): 0.416280 sq. miles (1.078160 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.416280 sq. miles (1.078160 sq. km) FIPS code: 56286 Located within: Indiana (IN), FIPS 18 Location: 39.339474 N, 85.204640 W ZIP Codes (1990): 47036 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Oldenburg, IN Oldenburg