The Portland metropolitan area or Greater Portland is a metropolitan area in the U.S. states of Oregon and Washington centered on the principal city of Portland, Oregon. The U.S. Office of Management and Budget identifies it as the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area, a metropolitan statistical area used by the United States Census Bureau and other entities. The OMB defines the area as comprising Clackamas, Columbia, Multnomah, Washington, and Yamhill Counties in Oregon, and Clark and Skamania Counties in Washington.