15234 -- U.S. ZIP code Municipality (1990): CASTLE SHANNON, Pennsylvania All ZIPs for this municipality (1990): 15234 Population (2000): 14911 Housing Units (2000): 6669 Land area (2000): 3.241352 sq. miles (8.395063 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.241352 sq. miles (8.395063 sq. km) Located within: Pennsylvania (PA) Location: 40.369619 N, 80.018312 W