Lamar, MO -- U.S. city in Missouri Population (2000): 4425 Housing Units (2000): 1995 Land area (2000): 3.832791 sq. miles (9.926882 sq. km) Water area (2000): 0.303373 sq. miles (0.785733 sq. km) Total area (2000): 4.136164 sq. miles (10.712615 sq. km) FIPS code: 40376 Located within: Missouri (MO), FIPS 29 Location: 37.493676 N, 94.272111 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Lamar, MO Lamar