8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 62644 | Havana | 4,690 |
| 62664 | Mason City | 2,945 |
| 62682 | San Jose | 751 |
| 62655 | Kilbourne | 719 |
| 62633 | Easton | 603 |
| 61567 | Topeka | 500 |
| 62617 | Bath | 478 |
| 61532 | Forest City | 410 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Mason County, Illinois (US Census).