St. Clair, PA -- U.S. borough in Pennsylvania Population (2000): 3254 Housing Units (2000): 1647 Land area (2000): 1.222516 sq. miles (3.166302 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.222516 sq. miles (3.166302 sq. km) FIPS code: 67224 Located within: Pennsylvania (PA), FIPS 42 Location: 40.717692 N, 76.189589 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Clair, PA St. Clair