There are 14 cities in Marion County, Illinois.

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City
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
Centralia1Illinois11,65112,151-1.19%1,4238.19
Salem2Illinois6,9297,265-1.31%9966.96
Sandoval3Illinois1,1111,156-1.07%1,1151
Central City4Illinois1,0561,101-1.22%1,8690.56
Wamac5Illinois961984-0.62%6841.41
Odin6Illinois891937-1.44%8881
Kinmundy7Illinois706731-0.98%6591.07
Junction City8Illinois512526-0.97%7490.68
Patoka9Illinois498523-1.39%4471.11
Iuka10Illinois482507-1.43%6580.73
Alma11Illinois299313-1.32%2641.13
Kell12Illinois166174-1.19%1661
Vernon13Illinois101102 1150.88
Walnut Hill14Illinois9195-1.09%2390.38
showing: 14 rows

Cities in Marion County, Illinois by Population (2024)

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 14 cities in Marion County, Illinois.

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