12 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 48846 | Ionia | 21,613 |
| 48875 | Portland | 11,400 |
| 48809 | Belding | 11,038 |
| 48849 | Lake Odessa | 5,723 |
| 48881 | Saranac | 5,499 |
| 48851 | Lyons | 2,462 |
| 48815 | Clarksville | 2,364 |
| 48865 | Orleans | 1,884 |
| 48860 | Muir | 1,339 |
| 48873 | Pewamo | 1,250 |
| 48845 | Hubbardston | 1,218 |
| 48870 | Palo | 194 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 12 ZCTAs in Ionia County, Michigan (US Census).