Polson is a city in Lake County, Montana, United States, on the southern shore of Flathead Lake and within the Flathead Indian Reservation. T…Polson is a city in Lake County, Montana, United States, on the southern shore of Flathead Lake and within the Flathead Indian Reservation. The population was 5,148 at the 2020 census. It is the county seat of Lake County. In 1898 the city was named after pioneer rancher David Polson. It was incorporated in 1910.
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