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is a city in and the county seat of Sanders County, Montana, United States. The population was 1,321 at the 2000 census. The largest employer in the city is the nearby Spring Creek Lodge Academy, which closed on Jan. 2009.
Thompson Falls is named for the British explorer, geographer and fur trader David Thompson, who in 1809 founded Saleesh House, a North West Company fur trading post. The arrival of the railroad in 1881 brought the first real activity to the area, two years later when the gold rush hit nearby Couer D'Alene the town grew to accommodate the men going over the Murray trail to the mines. In 1885 John Russell bought and plotted the town site.