Washington County, Missouri Cities (2025)

4 cities

City
Rank
2025 Pop.
2020 Pop.
Change
Density
Area (mi²)
Type
Potosi12,5382,543-0.04%1,0902.33 City
Irondale23683670%6900.53 City
Mineral Point32302250.44%9580.24 Town
Caledonia41331320%8110.16 Village

Washington County Cities Summary

Largest City

Potosi is the largest city in Washington County, with a population of 2,538.

Smallest City

Caledonia is the smallest city in Washington County.

10 Largest Cities

There are 4 cities in Washington County, Missouri.

Location of Washington County