33050 -- U.S. ZIP code Municipality (1990): MARATHON, Florida All ZIPs for this municipality (1990): 33050 Population (2000): 11486 Housing Units (2000): 8914 Land area (2000): 10.186564 sq. miles (26.383078 sq. km) Water area (2000): 0.177229 sq. miles (0.459020 sq. km) Total area (2000): 10.363793 sq. miles (26.842098 sq. km) Located within: Florida (FL) Location: 24.731758 N, 81.027800 W