Martinsburg, IA -- U.S. city in Iowa Population (2000): 126 Housing Units (2000): 60 Land area (2000): 0.377935 sq. miles (0.978846 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.377935 sq. miles (0.978846 sq. km) FIPS code: 49935 Located within: Iowa (IA), FIPS 19 Location: 41.178350 N, 92.251326 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Martinsburg, IA Martinsburg