Williamson County, Illinois
Williamson County is a county in Illinois with an estimated population of 66,706 in 2023. 12 cities, towns and Census places in it are indexed here.
Largest places in Williamson County
Marion 16,852Herrin 12,178Carterville 5,808Johnston City 3,308Cambria 1,769Crainville 1,473Energy 953Hurst 749Pittsburg 559Creal Springs 497Freeman Spur 269Bush 238
About Williamson County
Williamson County is one of the counties of Illinois. County governments in Illinois handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.