Westerville, OH -- U.S. city in Ohio Population (2000): 35318 Housing Units (2000): 13143 Land area (2000): 12.387394 sq. miles (32.083203 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 12.387394 sq. miles (32.083203 sq. km) FIPS code: 83342 Located within: Ohio (OH), FIPS 39 Location: 40.123496 N, 82.921432 W ZIP Codes (1990): 43081 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Westerville, OH Westerville