Columbia -- U.S. County in Pennsylvania Population (2000): 64151 Housing Units (2000): 27733 Land area (2000): 485.546308 sq. miles (1257.559112 sq. km) Water area (2000): 4.240671 sq. miles (10.983287 sq. km) Total area (2000): 489.786979 sq. miles (1268.542399 sq. km) Located within: Pennsylvania (PA), FIPS 42 Location: 41.041897 N, 76.394082 W Headwords: Columbia Columbia, PA Columbia County Columbia County, PA