Portland is the largest city in the U.S. state of Oregon. It is the county seat of Multnomah County. About 538,544 people live in the city of Portland, and about 1,927,881 people live in the city's metropolitan area. It is found in the north part of the state, where the Willamette River meets the Columbia River. Portland has the second most people of any city in the Northwest United States, after the city of Seattle.