Multnomah County /mʌltˈnoʊmə/ is one of 36 counties in the U.S. state of Oregon. As of the 2020 United States Census, the county's population was 815,428.[1] Its county seat, Portland, is the state's largest city.[2]
Multnomah County is part of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. It is the state's most populous county.[3]