15139 -- U.S. ZIP code Municipality (1990): OAKMONT, Pennsylvania All ZIPs for this municipality (1990): 15139 Population (2000): 6911 Housing Units (2000): 3269 Land area (2000): 1.967978 sq. miles (5.097039 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.967978 sq. miles (5.097039 sq. km) Located within: Pennsylvania (PA) Location: 40.519518 N, 79.837620 W