11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61856 | Monticello | 8,315 |
| 61813 | Bement | 1,665 |
| 61818 | Cerro Gordo | 1,579 |
| 61854 | Mansfield | 1,409 |
| 61913 | Atwood | 1,229 |
| 61884 | White Heath | 1,081 |
| 61929 | Hammond | 639 |
| 61839 | De Land | 589 |
| 61830 | Cisco | 422 |
| 61936 | La Place | 286 |
| 61855 | Milmine | 103 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Piatt County, Illinois (US Census).