Washington County, Missouri Cities (2024)

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
Potosi12,5392,543-0.04%1,0912.3City
Irondale23683670%6900.5City
Mineral Point32292250.44%9540.2Town
Caledonia41331320%8110.2Village

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Washington County, Missouri?

Potosi is the largest city in Washington County.

What is the smallest city in Washington County, Missouri?

Caledonia is the smallest city in Washington County.

How many cities are in Washington County?

There are 4 cities in Washington County, Missouri.

Frequently Asked Questions