33865 -- U.S. ZIP code Municipality (1990): ONA, Florida All ZIPs for this municipality (1990): 33865 Population (2000): 681 Housing Units (2000): 313 Land area (2000): 140.742241 sq. miles (364.520714 sq. km) Water area (2000): 0.335770 sq. miles (0.869639 sq. km) Total area (2000): 141.078011 sq. miles (365.390353 sq. km) Located within: Florida (FL) Location: 27.432764 N, 81.937037 W