34946 -- 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): 6746 Housing Units (2000): 3652 Land area (2000): 14.956863 sq. miles (38.738095 sq. km) Water area (2000): 0.028987 sq. miles (0.075075 sq. km) Total area (2000): 14.985850 sq. miles (38.813170 sq. km) Located within: Florida (FL) Location: 27.485272 N, 80.352432 W