Tualatin Valley
| Tualatin Valley | |
| Valley | |
 The Tualatin Valley from Bald Peak State Scenic Viewpoint
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| Name origin: Atfalati | |
| Nickname: T.V. | |
| Country | United States |
|---|---|
| State | Oregon |
| Districts | Washington County, Clackamas County |
| Part of | Willamette Valley |
| Borders on | Northern Oregon Coast Range (West), Tualatin Mountains (North and East), Chehalem Mountains (South) |
| River | Tualatin River |
| Location | Hillsboro |
| - elevation | 55 m (180 ft) |
| - coordinates | 45°30′38″N 122°59′19″W / 45.51056°N 122.98861°WCoordinates: 45°30′38″N 122°59′19″W / 45.51056°N 122.98861°W |
 The Tualatin River
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| Coordinates | |
The Tualatin Valley is a farming and suburban region southwest of Portland, Oregon in the United States. The valley is formed by the meandering Tualatin River, a tributary of the Willamette River at the northwest corner of the Willamette Valley, east of the Northern Oregon Coast Range. Most of the valley is located within Washington County, separated from Portland by the Tualatin Mountains. Communities in the Tualatin Valley include Banks, Forest Grove, Cornelius, Hillsboro, Aloha, Beaverton, Sherwood, Tigard, and Tualatin.
In the early 19th century, the valley was inhabited by the Atfalati, a hunter-gatherer Kalapuyan band that spoke a dialect of Northern Kalapuyan. In the middle 19th century, the Atfalati lived in several villages in the valley, including Chakeipi ("Place of the Beaver", translated by early white settlers as "Beaver Dam"). Early Euro-American settlers called the valley the "Twality Plains", a corruption of the name of the Atfalati tribe. Other early variations included Falatin, Nefalatine, Twalaity, and Quality, with each roughly translated as slow river to describe the Tualatin River, or may translate as land without trees.
The valley was one of the earliest settled farming regions in Oregon, as settlers began arriving in 1840. In the spring of 1847, Lawrence Hall filed the first land claim, comprising 640 acres (2.6 km²), at Beaver Dam (later Beaverton) and constructed the first grist mill in the valley. In 1849 Thomas Hicklin Denney and his wife Berrilla built the first sawmill in the Beaverton area, leading to a later boom in the timber industry.
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