33868 -- U.S. ZIP code Municipality (1990): POLK CITY, Florida All ZIPs for this municipality (1990): 33868 Population (2000): 10885 Housing Units (2000): 3853 Land area (2000): 139.228725 sq. miles (360.600726 sq. km) Water area (2000): 1.867568 sq. miles (4.836978 sq. km) Total area (2000): 141.096293 sq. miles (365.437704 sq. km) Located within: Florida (FL) Location: 28.180035 N, 81.818630 W