Custer County, Idaho Cities (2026)

4 cities

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Challis19678981.26%4902 City
Mackay24994422.04%5761 City
Stanley31251161.63%2301 City
Clayton412110%1880 City

Custer County Cities Summary

Largest City

Challis is the largest city in Custer County, with a population of 967.

Smallest City

Clayton is the smallest city in Custer County, with a population of 12.

10 Largest Cities

There are 4 cities in Custer County, Idaho.

Location of Custer County