Williamson 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
Marion116,85616,8400.02%1,17014.4City
Herrin212,12412,339-0.44%1,2539.7City
Carterville35,7935,852-0.26%1,0935.3City
Johnston City43,2843,379-0.73%1,5522.1City
Cambria51,8411,5524.07%1,3011.4Village
Energy6947970-0.63%7921.2Village
Hurst7746758-0.4%8410.9City
Pittsburg8556566-0.54%2692.1Village
Creal Springs9494505-0.6%4811.0City
Freeman Spur10267274-0.74%6690.4Village
Crab Orchard11247222-2.37%1771.4CDP
Whiteash12220837.32%2530.9CDP
Spillertown13176180-0.56%5480.3Village
Colp14174178-0.57%1,2990.1Village

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 Williamson County, Illinois?

Marion is the largest city in Williamson County.

What is the smallest city in Williamson County, Illinois?

Colp is the smallest city in Williamson County.

How many cities are in Williamson County?

There are 14 cities in Williamson County, Illinois.

Frequently Asked Questions