Farmington is a town in Whitman County, Washington, United States. The population was 131 at the 2020 census. Farmington was laid out in 1878. Farmington was officially incorporated in 1888. At Farmington's peak the town boasted a population of just under 500. As demand for farm labor decreased, the population and business of the town decreased. Toda…Farmington is a town in Whitman County, Washington, United States. The population was 131 at the 2020 census. Farmington was laid out in 1878. Farmington was officially incorporated in 1888. At Farmington's peak the town boasted a population of just under 500. As demand for farm labor decreased, the population and business of the town decreased. Today, Farmington has a population of about 150.
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