12 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 48846 | Ionia | 21,940 |
| 48809 | Belding | 11,292 |
| 48875 | Portland | 11,090 |
| 48849 | Lake Odessa | 5,801 |
| 48881 | Saranac | 5,358 |
| 48851 | Lyons | 2,310 |
| 48815 | Clarksville | 2,155 |
| 48865 | Orleans | 1,904 |
| 48860 | Muir | 1,395 |
| 48873 | Pewamo | 1,371 |
| 48845 | Hubbardston | 1,109 |
| 48870 | Palo | 204 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 12 ZCTAs in Ionia County, Michigan (US Census).