There are 12 zip codes in Williamson County, Illinois. The most populated is 62959, located in Marion. * 2024 populations estimated based on the latest ACS 5-year data.

CSV JSON
Zip Code
Population
City
6295927,255Marion
6294812,679Herrin
6291810,844Carterville
629515,574Johnston City
629024,344Carbondale
629222,824Creal Springs
629741,523Pittsburg
629331,253Energy
62949770Hurst
62915431Cambria
62921243Colp
62841140Freeman Spur

Zip Codes in Williamson County, Illinois by Population (2024)