Avon was named after a local Welshman, and means 'river' in Welsh. Avon is located next to the picuresque Little Blackfoot River. The first post office was established in 1884 with William Cramer as postmaster. Avon was a supply point where sheep and cattle ranchers joined with prospectors and miners.
Avon is located in southwestern Montana, 32 miles west of Helena on US Highway 12, west of MacDonald Pass.