14 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 48801 | Alma | 13,278 |
| 48880 | Saint Louis | 9,994 |
| 48847 | Ithaca | 5,663 |
| 48615 | Breckenridge | 3,061 |
| 48871 | Perrinton | 2,103 |
| 48877 | Riverdale | 1,962 |
| 48806 | Ashley | 1,752 |
| 48889 | Sumner | 1,528 |
| 48832 | Elwell | 1,307 |
| 48662 | Wheeler | 1,185 |
| 48856 | Middleton | 966 |
| 48807 | Bannister | 658 |
| 48874 | Pompeii | 107 |
| 48862 | North Star | 59 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 14 ZCTAs in Gratiot County, Michigan (US Census).