Washington County, Idaho Cities (2025)

3 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Change
Density
Area (mi²)
Type
Weiser16,3205,6602.13%2,1192.98 City
Cambridge23643361.68%7520.48 City
Midvale32291963.15%892.57 City

Washington County Cities Summary

Largest City

Weiser is the largest city in Washington County, with a population of 6,320.

Smallest City

Midvale is the smallest city in Washington County.

10 Largest Cities

There are 3 cities in Washington County, Idaho.