Marion, IL Insights: Population,
Zip Codes, Influence, and Service Areas

Marion is a city in Williamson and Johnson Counties, Illinois, United States, and is the county seat of Williamson County. The population was 16,855 at the 2020 census. It is part of a dispersed urban area that developed out of the early 20th-century coal fields.

Zip Codes in Marion, IL that we also serve: 62959





Cities Close To Marion, IL That We Also Serve