33149 -- U.S. ZIP code Municipality (1990): KEY BISCAYNE, Florida All ZIPs for this municipality (1990): 33149 Population (2000): 10513 Housing Units (2000): 6381 Land area (2000): 4.726906 sq. miles (12.242629 sq. km) Water area (2000): 0.001415 sq. miles (0.003665 sq. km) Total area (2000): 4.728321 sq. miles (12.246294 sq. km) Located within: Florida (FL) Location: 25.700966 N, 80.161950 W