what county is beaverton or
City of Beaverton. Beaverton is a city in Washington County, in the U.S. state of Oregon. The city center is 7 miles (11 km) west of downtown Portland in the Tualatin River Valley. As of the 2010 census, the population is 89,803. This makes it the second-largest city in the county and Oregon's sixth-largest city. Fire protection and EMS services are provided through Tualatin Valley Fire and Rescue. In 2010, Beaverton was named by Money magazine as one of the 100 best places to live, among smaller cities in the country.