Eureka, MO -- U.S. city in Missouri Population (2000): 7676 Housing Units (2000): 2622 Land area (2000): 10.051548 sq. miles (26.033388 sq. km) Water area (2000): 0.060976 sq. miles (0.157927 sq. km) Total area (2000): 10.112524 sq. miles (26.191315 sq. km) FIPS code: 22834 Located within: Missouri (MO), FIPS 29 Location: 38.502736 N, 90.645075 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Eureka, MO Eureka