Beaverton is a city in the Tualatin Valley, located in Washington County in the U.S. state of Oregon, with a small portion bordering Portland. Th…Beaverton is a city in the Tualatin Valley, located in Washington County in the U.S. state of Oregon, with a small portion bordering Portland. The city is among the main cities that make up the Portland metropolitan area. Its population was 97,494 at the 2020 census, making it the second most populous city in the county and the seventh-most populous city in Oregon. Beaverton is an economic center for Washington County along with neighboring Hillsboro.