15540 -- U.S. ZIP code Municipality (1990): FORT HILL, Pennsylvania All ZIPs for this municipality (1990): 15540 Population (2000): 353 Housing Units (2000): 271 Land area (2000): 43.659198 sq. miles (113.076799 sq. km) Water area (2000): 0.579382 sq. miles (1.500593 sq. km) Total area (2000): 44.238580 sq. miles (114.577392 sq. km) Located within: Pennsylvania (PA) Location: 39.798343 N, 79.220641 W