15122 -- U.S. ZIP code Municipality (1990): W MIFFLIN FIN, Pennsylvania All ZIPs for this municipality (1990): 15122 Population (2000): 21861 Housing Units (2000): 9692 Land area (2000): 13.898924 sq. miles (35.998046 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 13.898924 sq. miles (35.998046 sq. km) Located within: Pennsylvania (PA) Location: 40.366177 N, 79.894181 W