34945 -- U.S. ZIP code Municipality (1990): FORT PIERCE, Florida All ZIPs for this municipality (1990): 34945 34946 34947 34949 34950 34951 34981 34982 Population (2000): 4096 Housing Units (2000): 1444 Land area (2000): 194.368193 sq. miles (503.411287 sq. km) Water area (2000): 0.195669 sq. miles (0.506780 sq. km) Total area (2000): 194.563862 sq. miles (503.918067 sq. km) Located within: Florida (FL) Location: 27.431607 N, 80.491504 W