Lake County, Montana

Lake County, Montana
Location within the U.S. state of Montana
Coordinates: 47°39′N 114°05′W / 47.65°N 114.09°W / 47.65; -114.09
Country United States
State Montana
Founded1923
Named afterFlathead Lake
SeatPolson
Largest cityPolson
Area
 • Total
1,654 sq mi (4,280 km2)
 • Land1,490 sq mi (3,900 km2)
 • Water164 sq mi (420 km2)  9.9%
Population
 (2020)
 • Total
31,134
 • Estimate 
(2024)
33,403
 • Density20.9/sq mi (8.07/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Congressional district1st
Websitewww.lakemt.gov
  • Montana county number 15

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.