Jefferson County, Montana Cities (2025)

2 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Boulder11,3301,2051.92%1,1831 City
Whitehall21,1431,0082.42%1,6211 Town

Jefferson County Cities Summary

Largest City

Boulder is the largest city in Jefferson County, with a population of 1,330.

Smallest City

Whitehall is the smallest city in Jefferson County, with a population of 1,143.

10 Largest Cities

There are 2 cities in Jefferson County, Montana.

Location of Jefferson County