| Zip Code | City | Population ↓ |
|---|---|---|
| 62521 | Decatur | 33,453 |
| 62526 | Decatur | 30,572 |
| 62522 | Decatur | 15,010 |
| 62549 | Mt Zion | 6,684 |
| 62535 | Forsyth | 3,856 |
| 61756 | Maroa | 2,564 |
| 62501 | Argenta | 2,242 |
| 62554 | Oreana | 1,727 |
| 62544 | Macon | 1,600 |
| 62573 | Warrensburg | 1,319 |
| 61925 | Dalton City | 1,054 |
| 62551 | Niantic | 924 |
| 62523 | Decatur | 800 |
| 62514 | Boody | 380 |
| 62537 | Harristown | 329 |
| 62532 | Elwin | 64 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Macon County, Illinois (US Census).