St. Clair County, Missouri Cities (2025)

6 cities

City
Rank
2025 Pop.
2020 Pop.
Change
Density
Area (mi²)
Type
Appleton City11,1051,0341.28%9631.15 City
Osceola29959351.22%9221.08 City
Lowry City36666161.52%6491.03 City
Collins41351271.5%5470.25 Village
Roscoe597911.04%631.53 Village
Vista637342.78%2820.13 Village

St. Clair County Cities Summary

Largest City

Appleton City is the largest city in St. Clair County, with a population of 1,105.

Smallest City

Vista is the smallest city in St. Clair County.

10 Largest Cities

There are 6 cities in St. Clair County, Missouri.

Location of St. Clair County