33801 -- U.S. ZIP code Municipality (1990): LAKELAND, Florida All ZIPs for this municipality (1990): 33801 33803 33805 33809 Population (2000): 31593 Housing Units (2000): 15444 Land area (2000): 18.191638 sq. miles (47.116124 sq. km) Water area (2000): 1.123349 sq. miles (2.909461 sq. km) Total area (2000): 19.314987 sq. miles (50.025585 sq. km) Located within: Florida (FL) Location: 28.041198 N, 81.923925 W