Lincoln County, Montana

Lincoln County
Lincoln County Courthouse
Location within the U.S. state of Montana
Montana's location within the U.S.
Coordinates: 48°32′N 115°25′W / 48.54°N 115.41°W / 48.54; -115.41
Country United States
State Montana
FoundedMarch 9, 1909
Named afterAbraham Lincoln
SeatLibby
Largest cityLibby
Area
  Total
3,675 sq mi (9,520 km2)
  Land3,613 sq mi (9,360 km2)
  Water62 sq mi (160 km2)  1.7%
Population
 (2020)
  Total
19,677
  Estimate 
(2024)
22,184
  Density5.4/sq mi (2.1/km2)
Time zoneUTC−7 (Mountain)
  Summer (DST)UTC−6 (MDT)
Congressional district1st
Websitewww.lincolncountymt.us
  • Montana county number 56,
    the highest county number

Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's north border and thus shares the US-Canadian border with the Canadian province of British Columbia.

This heavily wooded and mountainous county once was part of Flathead County until residents of Libby and Eureka petitioned the state legislature for separation. Libby won an election over Eureka to host the county seat.