Beaverhead County, Montana

Beaverhead County
Beaverhead County
County
	Beaverhead County Courthouse
	Location within the U.S. state of Montana
	Montana's location within the U.S.
	Coordinates: 45°07′N 112°54′W / 45.12°N 112.9°W
Country	United States
State	Montana
Founded	1865
Seat	Dillon
Largest city	Dillon
Area
• Total	5,572 sq mi (14,430 km2)
• Land	5,542 sq mi (14,350 km2)
• Water	30 sq mi (80 km2) 0.5%
Population (2020)
• Total	9,371
• Estimate (2022)	9,719
• Density	1.7/sq mi (0.65/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	1st
Website	www.beaverheadcounty.org
	Montana county number 18;

Beaverhead County is the largest county by area in the U.S. state of Montana. As of the 2020 census, the population was 9,371.^[1] Its county seat is Dillon.^[2] The county was founded in 1865.^[3]

Much of the perimeter of the county is the Continental Divide, including its entire border with the state of Idaho. The divide heads east into Montana at the county border with Ravalli County, between Lost Trail Pass and Chief Joseph Pass.

^ "State & County QuickFacts". United States Census Bureau. Retrieved May 7, 2023.
^ "Find a County". National Association of Counties. Archived from the original on July 4, 2012. Retrieved June 7, 2011.
^ "Montana Place Names Companion". Montana Place Names From Alzada to Zortman. Montana Historical Society Research Center. Retrieved December 1, 2014.