Williamson County Illinois is covered by a total of 20 ZIP Codes. There are 10 ZIP Codes in Williamson County that extend into adjacent counties (Franklin County, Jackson County, Johnson County, Pope County, Saline County, and Union County). Of the ZIP codes within or partially within Williamson County there are 16 Standard ZIP Codes and 4 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Williamson County and can be turned on and off. Each type of postal code can also be turned on and off.
| ZIP Code | ZIP Code City/Town | ZIP Code Type | |||
|---|---|---|---|---|---|
| Freeman Spur | PO Box | |||
| Thompsonville | Standard | |||
| West Frankfort | Standard | |||
| Carbondale | Standard | |||
| Carbondale | Standard | |||
| Cambria | PO Box | |||
| Carrier Mills | Standard | |||
| Carterville | Standard | |||
| Colp | PO Box | |||
| Creal Springs | Standard | |||
| De Soto | Standard | |||
| Energy | Standard | |||
| Goreville | Standard | |||
| Herrin | Standard | |||
| Hurst | PO Box | |||
| Johnston City | Standard | |||
| Makanda | Standard | |||
| Marion | Standard | |||
| Pittsburg | Standard | |||
| Stonefort | Standard |