15214 -- U.S. ZIP code Municipality (1990): OBSERVATORY, Pennsylvania All ZIPs for this municipality (1990): 15214 Population (2000): 17519 Housing Units (2000): 7814 Land area (2000): 4.579251 sq. miles (11.860204 sq. km) Water area (2000): 0.002777 sq. miles (0.007193 sq. km) Total area (2000): 4.582028 sq. miles (11.867397 sq. km) Located within: Pennsylvania (PA) Location: 40.479469 N, 80.011500 W