14 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 48801 | Alma | 13,621 |
| 48880 | Saint Louis | 10,026 |
| 48847 | Ithaca | 5,599 |
| 48615 | Breckenridge | 2,817 |
| 48871 | Perrinton | 2,232 |
| 48877 | Riverdale | 1,967 |
| 48806 | Ashley | 1,794 |
| 48889 | Sumner | 1,482 |
| 48662 | Wheeler | 1,293 |
| 48832 | Elwell | 1,276 |
| 48856 | Middleton | 879 |
| 48807 | Bannister | 787 |
| 48874 | Pompeii | 185 |
| 48862 | North Star | 25 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Gratiot County, Michigan (US Census).