16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 62521 | Decatur | 32,665 |
| 62526 | Decatur | 30,483 |
| 62522 | Decatur | 15,185 |
| 62549 | Mt Zion | 6,454 |
| 62535 | Forsyth | 3,502 |
| 61756 | Maroa | 2,542 |
| 62501 | Argenta | 2,324 |
| 62554 | Oreana | 1,832 |
| 62544 | Macon | 1,668 |
| 61925 | Dalton City | 1,182 |
| 62573 | Warrensburg | 1,147 |
| 62551 | Niantic | 820 |
| 62523 | Decatur | 707 |
| 62514 | Boody | 297 |
| 62537 | Harristown | 272 |
| 62532 | Elwin | 40 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Macon County, Illinois (US Census).