32958 -- U.S. ZIP code Municipality (1990): SEBASTIAN, Florida All ZIPs for this municipality (1990): 32958 Population (2000): 20441 Housing Units (2000): 10008 Land area (2000): 30.222369 sq. miles (78.275574 sq. km) Water area (2000): 0.422069 sq. miles (1.093154 sq. km) Total area (2000): 30.644438 sq. miles (79.368728 sq. km) Located within: Florida (FL) Location: 27.787830 N, 80.482669 W