• Tarkio was founded in 1880, and grew rapidly. The Tarkio Avalanche newspaper was founded in 1884. By 1900, the United States CensusU.S. Census shows 2,845 persons living in Tarkio. According to the 1910, 1920, and 1930 census, the number of residents held fairly steady for the next 30 years. Source:

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