15534 -- U.S. ZIP code Municipality (1990): BUFFALO MILLS, Pennsylvania All ZIPs for this municipality (1990): 15534 Population (2000): 997 Housing Units (2000): 485 Land area (2000): 53.212042 sq. miles (137.818551 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 53.212042 sq. miles (137.818551 sq. km) Located within: Pennsylvania (PA) Location: 39.904209 N, 78.701593 W