Adams -- U.S. County in Pennsylvania Population (2000): 91292 Housing Units (2000): 35831 Land area (2000): 520.007480 sq. miles (1346.813133 sq. km) Water area (2000): 1.512732 sq. miles (3.917957 sq. km) Total area (2000): 521.520212 sq. miles (1350.731090 sq. km) Located within: Pennsylvania (PA), FIPS 42 Location: 39.854379 N, 77.182542 W Headwords: Adams Adams, PA Adams County Adams County, PA