Macon County, Illinois Zip Codes
| Decatur | 33,453 |
| Decatur | 30,572 |
| Decatur | 15,010 |
| Mt Zion | 6,684 |
| Forsyth | 3,856 |
| Maroa | 2,564 |
| Argenta | 2,242 |
| Oreana | 1,727 |
| Macon | 1,600 |
| Warrensburg | 1,319 |
| Dalton City | 1,054 |
| Niantic | 924 |
| Decatur | 800 |
| Boody | 380 |
| Harristown | 329 |
| Elwin | 64 |
- Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.