Tualatin Hills Park & Recreation District (THPRD) is a special parks district located in the eastern part of Washington County in the U.S. state of Oregon. Created in 1955, the district covers all of the city of Beaverton and many of those communities surrounding Beaverton in the Portland metropolitan area. The district covers an area of 50 square miles (130 km²) and serves a population of about 220,000, making it the largest parks district in Oregon. Tualatin Hills operates over 200 facilities totaling 2,100 acres (850 ha), including eight swimming centers.