Portlan is a city located near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. With an estimated population of 568,380 it is Oregon's most populous city, and the third most populous city in the Pacific Northwest, after Vancouver, British Columbia, and Seattle, Washington. Approximately two million people live in Portland metropolitan area (MSA), the 23rd most populous in the United States as of July 2006.