32421 -- U.S. ZIP code Municipality (1990): ALTHA, Florida All ZIPs for this municipality (1990): 32421 Population (2000): 3725 Housing Units (2000): 1648 Land area (2000): 132.253605 sq. miles (342.535249 sq. km) Water area (2000): 1.184933 sq. miles (3.068962 sq. km) Total area (2000): 133.438538 sq. miles (345.604211 sq. km) Located within: Florida (FL) Location: 30.540300 N, 85.182297 W