Avoca, IA -- U.S. city in Iowa Population (2000): 1610 Housing Units (2000): 706 Land area (2000): 1.938437 sq. miles (5.020528 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.938437 sq. miles (5.020528 sq. km) FIPS code: 03970 Located within: Iowa (IA), FIPS 19 Location: 41.478990 N, 95.337347 W ZIP Codes (1990): 51521 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Avoca, IA Avoca