15241 -- U.S. ZIP code Municipality (1990): UPPER SAINT CLAI, Pennsylvania All ZIPs for this municipality (1990): 15241 Population (2000): 20616 Housing Units (2000): 7433 Land area (2000): 10.138769 sq. miles (26.259291 sq. km) Water area (2000): 0.007900 sq. miles (0.020462 sq. km) Total area (2000): 10.146669 sq. miles (26.279753 sq. km) Located within: Pennsylvania (PA) Location: 40.329619 N, 80.073640 W