15538 -- U.S. ZIP code Municipality (1990): GLENCOE, Pennsylvania All ZIPs for this municipality (1990): 15538 Population (2000): 796 Housing Units (2000): 580 Land area (2000): 72.371213 sq. miles (187.440572 sq. km) Water area (2000): 0.004755 sq. miles (0.012316 sq. km) Total area (2000): 72.375968 sq. miles (187.452888 sq. km) Located within: Pennsylvania (PA) Location: 39.863486 N, 78.842354 W