Tualatin is a city located primarily in Washington County in the U.S. state of Oregon. A small portion of the city is also located in neighboring Clackamas County. It is a southwestern suburb in the Portland Metropolitan Area that is located south of Tigard. The population was 26,054 at the 2010 census. The name of the city is taken from the Tualatin River, which flows along most of the city's northern boundary. According to Oregon Geographic Names, a post office with the spelling "Tualitin" was established November 5, 1869, and the spelling changed to "Tualatin" in 1915. In the 1850s, the... settlement was first called Galbreath after its founder Samuel Galbreath. In 1853, Galbreath built the first bridge over the Tualatin river, and the town became known as Bridgeport. In the 1880s, John Sweek platted a town around the new railroad depot, and named the town Tualatin. It was incorporated as the City of Tualatin in 1913. In 1962, a fossilized mastodon was excavated in what is now the Fred Meyer parking lot. As of the census of 2000, there were 22,791 people, 8,651 households, and 5,804 families residing in the city. The population density was 2,928.
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| County: | Washington County |
| State: | Oregon |
| Country: | United States of America |
| Population: | 26,476 |
| Area: | 7.8 sq. mi. |
| Time zone: | Pacific Time Zone |
| Also known as: | Tualatin, Oregon |