Portland is a city located near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. With a population of 568,380 it is Oregon's most populous city, and the third most populous city in the Pacific Northwest, after Seattle, Washington and Vancouver, British Columbia. Approximately two million people live in Portland metropolitan area (MSA), the 23rd most populous in the United States as of July 2006. Portland was incorporated in 1851 and is the seat of Multnomah County. The city extends slightly into Washington County to the west and Clackamas County to the south. It is governed by a commission based government headed by a mayor and four other commissioners. Portland's first mayor was Hugh O'Bryant who served for one year. Read more