Clark 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
Marshall13,8553,951-0.62%1,0513.7City
Casey22,3312,405-0.81%8892.6City
Martinsville31,0771,113-0.83%5332.0City
Westfield4517535-0.96%5291.0Village
West Union5182241-3.7%1011.8CDP

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 Clark County, Illinois?

Marshall is the largest city in Clark County.

What is the smallest city in Clark County, Illinois?

West Union is the smallest city in Clark County.

How many cities are in Clark County?

There are 5 cities in Clark County, Illinois.

Frequently Asked Questions