Clackamas -- U.S. County in Oregon Population (2000): 338391 Housing Units (2000): 136954 Land area (2000): 1868.173056 sq. miles (4838.545796 sq. km) Water area (2000): 10.833517 sq. miles (28.058678 sq. km) Total area (2000): 1879.006573 sq. miles (4866.604474 sq. km) Located within: Oregon (OR), FIPS 41 Location: 45.306684 N, 122.476588 W Headwords: Clackamas Clackamas, OR Clackamas County Clackamas County, OR