Jefferson County, Montana Cities (2026)

2 cities

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Boulder11,3551,2051.88%1,2061 City
Whitehall21,1701,0082.36%1,6601 Town

Jefferson County Cities Summary

Largest City

Boulder is the largest city in Jefferson County, with a population of 1,355.

Smallest City

Whitehall is the smallest city in Jefferson County, with a population of 1,170.

10 Largest Cities

There are 2 cities in Jefferson County, Montana.

Location of Jefferson County