Welcome to
Lake County, Montana


Located in northwestern Montana, Lake County is Montana's ninth most populated with 29,099 residents, according to the 2014 estimates produced by the U.S. Census Bureau, median income for Lake County households in 2012 were $38,268. Polson, the county seat, is the state's 18th largest city with a population of 4,488 according to the 2010 Census.

Flathead Lake, located in Polson, is the largest natural fresh water lake west of the Mississippi River in the United States, it stretches 27.3 miles long, 15.5 miles wide and a maximum depth of 370.7 feet. The county is 1,654 square miles in area; 1,490 square miles in land area and 164 in inland water area. If you would like more information on Flathead lake click here.

According to the Montana Almanac, by authors Andrea Merrill and Judy Jacobson, the county was established in 1923 and was one of the last counties to be formed in Montana. The authors add Flathead Lake was the inspiration for Lake county's name and Polson was named for Mission Valley stockman David Polson.

Lake County is home to the Confederated Salish and Kootenai Tribes of the Flathead Nation. The Flathead Reservation was established by the Hellgate Treaty of 1855. In 1845, Father Pierre Jean DeSmet arrived and helped establish the first permanent mission at St. Ignatius in 1854. Lake County is also home to the Mission Valley and Mission Mountain Range, Flathead Lake, the National Bison Range, Ninepipe- Swan- and Pablo National Wildlife Refuge.

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