Marion County, Illinois 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
Centralia111,74612,152-0.86%1,4328.2City
Salem26,9867,264-0.99%9997.0City
Sandoval31,1171,155-0.89%1,1211.0Village
Odin4901936-0.99%8981.0Village
Kinmundy5710732-0.84%5931.2City
Patoka6503523-0.98%4511.1Village
Iuka7489508-1.01%6670.7Village
Alma8302314-0.98%2671.1Village
Kell9167174-1.18%1671.0Village
Vernon1098101-1.01%1110.9Village
Walnut Hill119296-1.07%2420.4Village

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 Marion County, Illinois?

Centralia is the largest city in Marion County.

What is the smallest city in Marion County, Illinois?

Walnut Hill is the smallest city in Marion County.

How many cities are in Marion County?

There are 11 cities in Marion County, Illinois.

Frequently Asked Questions