There are 7 zip codes in Clark County, Illinois. The most populated is 62441, located in Marshall. * 2024 populations estimated based on the latest ACS 5-year data.

Zip Code
City
Population
62441Marshall6,927
62420Casey4,082
62442Martinsville2,540
62423Dennison843
62477West Union778
62474Westfield624
62478West York351

Clark County, Illinois Zip Codes by Population (2024)