Tigard ) is a city in Washington County, Oregon, United States. The population was 41,223 at the 2000 census. The 2009 estimate is 47,460 residents. As of 2007, Tigard was the state's 12th largest city. Incorporated in 1961, the city is located south of Beaverton and north of Tualatin, and is part of the Portland metropolitan area. Interstate 5 and Oregon Route 217 are the main freeways in the city, with Oregon Route 99W and Oregon Route 210 serving as other major highways, with rail service provided by the TriMet operated Westside Express Service.