32656 -- U.S. ZIP code Municipality (1990): KEYSTONE HEIGHTS, Florida All ZIPs for this municipality (1990): 32656 Population (2000): 11709 Housing Units (2000): 5302 Land area (2000): 66.653795 sq. miles (172.632530 sq. km) Water area (2000): 4.619776 sq. miles (11.965165 sq. km) Total area (2000): 71.273571 sq. miles (184.597695 sq. km) Located within: Florida (FL) Location: 29.788679 N, 82.004210 W