Clarksville, MO -- U.S. city in Missouri Population (2000): 490 Housing Units (2000): 278 Land area (2000): 0.462178 sq. miles (1.197036 sq. km) Water area (2000): 0.360283 sq. miles (0.933129 sq. km) Total area (2000): 0.822461 sq. miles (2.130165 sq. km) FIPS code: 14194 Located within: Missouri (MO), FIPS 29 Location: 39.368769 N, 90.905018 W ZIP Codes (1990): 63336 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Clarksville, MO Clarksville