14 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 48801 | Alma | 13,433 |
| 48880 | Saint Louis | 9,952 |
| 48847 | Ithaca | 5,773 |
| 48615 | Breckenridge | 2,812 |
| 48871 | Perrinton | 2,233 |
| 48877 | Riverdale | 2,078 |
| 48806 | Ashley | 1,821 |
| 48889 | Sumner | 1,496 |
| 48832 | Elwell | 1,291 |
| 48662 | Wheeler | 1,278 |
| 48856 | Middleton | 842 |
| 48807 | Bannister | 706 |
| 48874 | Pompeii | 160 |
| 48862 | North Star | 39 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Gratiot County, Michigan (US Census).