Lake County is a county located in the northwest part of the U.S. state of Montana. As of the 2020 census, the population was 31,134. Its county seat is Polson. According to the United States Census Bureau, the county has a total area of 1,654 square miles, of which 1,490 square miles is land and 164 square miles is water. Over two-thirds of the county's land li…Lake County is a county located in the northwest part of the U.S. state of Montana. As of the 2020 census, the population was 31,134. Its county seat is Polson. According to the United States Census Bureau, the county has a total area of 1,654 square miles, of which 1,490 square miles is land and 164 square miles is water. Over two-thirds of the county's land lies within the Flathead Indian Reservation.
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