Williamsburg, IA -- U.S. city in Iowa Population (2000): 2622 Housing Units (2000): 1112 Land area (2000): 3.146269 sq. miles (8.148798 sq. km) Water area (2000): 0.008300 sq. miles (0.021498 sq. km) Total area (2000): 3.154569 sq. miles (8.170296 sq. km) FIPS code: 85845 Located within: Iowa (IA), FIPS 19 Location: 41.664281 N, 92.012334 W ZIP Codes (1990): 52361 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Williamsburg, IA Williamsburg