Tigard is a city in Washington County, Oregon, United States. The population was 48,035 at the 2010 census. 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. Public transit service is provided by TriMet, via several bus routes and the WES Commuter Rail line.
Before colonization by European settlers, the Atfalati inhabited the Tualatin Valley in several hunter-gatherer villages including Chachimahiyuk ("Place of aromatic herbs"), near present-day Tigard. Primary food stuffs included deer, camas root, fish, berries, elk, and various nuts. To encourage the growth of the camas plant and maintain a habitat beneficial to deer and elk, the group regularly burned the valley floor to discourage the growth of forests, a common practice among the Kalapuya. The Atfalati spoke the Tualatin-Yamhill (Northern Kalapuya) language, which was one of the three Kalapuyan languages.