Mason County Illinois is covered by a total of 11 ZIP Codes. There are 5 ZIP Codes in Mason County that extend into adjacent counties (Cass County, Fulton County, Logan County, and Tazewell County). Of the ZIP codes within or partially within Mason County there are 10 Standard 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 Mason 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 | |||
|---|---|---|---|---|---|
| Forest City | Standard | |||
| Manito | Standard | |||
| Topeka | Standard | |||
| Bath | Standard | |||
| Chandlerville | Standard | |||
| Easton | Standard | |||
| Havana | Standard | |||
| Kilbourne | Standard | |||
| Mason City | Standard | |||
| New Holland | Standard | |||
| San Jose | Standard |