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.

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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)