Fallon County, Montana

Fallon County
Fallon County Courthouse in Baker
Location within the U.S. state of Montana
Montana's location within the U.S.
Coordinates: 46°21′N 104°25′W / 46.35°N 104.41°W / 46.35; -104.41
Country United States
State Montana
FoundedDecember 9, 1913
SeatBaker
Largest cityBaker
Area
  Total
1,623 sq mi (4,200 km2)
  Land1,621 sq mi (4,200 km2)
  Water2.3 sq mi (6 km2)  0.1%
Population
 (2020)
  Total
3,049
  Estimate 
(2024)
2,946
  Density1.9/sq mi (0.73/km2)
Time zoneUTC−7 (Mountain)
  Summer (DST)UTC−6 (MDT)
Congressional district2nd
Websitewww.falloncounty.net
  • Montana county number 39

Fallon County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 3,049. Its county seat is Baker. The county was created in 1913 from a portion of Custer County. It is named for Benjamin O'Fallon, a nephew of Captain William Clark and an Indian agent for the upper Missouri region from 1823 to 1827.