Dayton, PA -- U.S. borough in Pennsylvania Population (2000): 543 Housing Units (2000): 254 Land area (2000): 0.449472 sq. miles (1.164126 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.449472 sq. miles (1.164126 sq. km) FIPS code: 18400 Located within: Pennsylvania (PA), FIPS 42 Location: 40.881095 N, 79.241526 W ZIP Codes (1990): 16222 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Dayton, PA Dayton