Portland is a city located in the US state of Oregon, near the confluence of the Willamette and Columbia rivers. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States. Portland is Oregon's most populous city, and the third most populous city in the Pacific Northwest region, after Seattle, Washington and Vancouver, British Columbia. Approximately 2,260,000 people live in the Portland metropolitan area (MSA), the 23rd most populous in the United States. Portland was incorporated in 1851 and is the county seat of Multnomah County. The city extends west into the Cedar Mill neighborhood in Washington County and south towards Lake Oswego in Clackamas County. The city has a commission-based government headed by a mayor and four other commissioners; the city and region are noted for strong land-use planning and investment in light rail. This is supported by Metro, a distinctive regional government.
Contributions by Nate Silva, Llywrch, and Cacophony.