Event Details

Dillon

Montana County Seat Challenge

Dillon, Montana; Beaverhead County

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Event Elevation: 5,102 feet

Dillon is a city in and the county seat of Beaverhead County, Montana, United States. The population was 3,880 at the 2020 census. The city was named for Sidney Dillon (1812–1892), president of Union Pacific Railroad. Dillon was founded in the Beaverhead Valley as a railroad town in 1880. Originally named “Terminus” as it was temporarily the northernmost stop on the Utah and Northern Railway while it was under construction, in 1881, the community was renamed for Union Pacific Railroad President Sidney Dillon, who had directed the project of bringing the railroad through to Butte, Montana. The town's location was selected by the railroad in part because of its proximity to gold mines in the area.

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. Its county seat is Dillon. The county was founded in 1865. 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.