15143 -- U.S. ZIP code Municipality (1990): SEWICKLEY, Pennsylvania All ZIPs for this municipality (1990): 15143 Population (2000): 16518 Housing Units (2000): 6925 Land area (2000): 35.635011 sq. miles (92.294252 sq. km) Water area (2000): 0.004246 sq. miles (0.010997 sq. km) Total area (2000): 35.639257 sq. miles (92.305249 sq. km) Located within: Pennsylvania (PA) Location: 40.561091 N, 80.155541 W