St. Johns, AZ -- U.S. city in Arizona Population (2000): 3269 Housing Units (2000): 1392 Land area (2000): 6.606885 sq. miles (17.111753 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 6.606885 sq. miles (17.111753 sq. km) FIPS code: 62350 Located within: Arizona (AZ), FIPS 04 Location: 34.501921 N, 109.371543 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Johns, AZ St. Johns