Multnomah -- U.S. County in Oregon Population (2000): 660486 Housing Units (2000): 288561 Land area (2000): 435.231702 sq. miles (1127.244885 sq. km) Water area (2000): 30.422240 sq. miles (78.793236 sq. km) Total area (2000): 465.653942 sq. miles (1206.038121 sq. km) Located within: Oregon (OR), FIPS 41 Location: 45.522473 N, 122.613233 W Headwords: Multnomah Multnomah, OR Multnomah County Multnomah County, OR