Marion County, Iowa Cities (2025)

9 cities

City
Rank
2025 Pop.
2020 Pop.
Change
Density
Area (mi²)
Type
Pella111,05510,4671.08%1,1839.34 City
Knoxville27,3407,570-0.62%1,5894.62 City
Pleasantville31,6901,6890%6912.45 City
Melcher-Dallas41,1761,196-0.34%1,1311.04 City
Bussey5370379-0.54%1,1900.31 City
Harvey62412360.42%3560.68 City
Hamilton71281250.79%2530.51 City
Swan877760%1250.62 City
Marysville947460%870.54 City

Marion County Cities Summary

Largest City

Pella is the largest city in Marion County, with a population of 11,055.

Smallest City

Marysville is the smallest city in Marion County.

10 Largest Cities

There are 9 cities in Marion County, Iowa.

Location of Marion County