10 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 45822 | Celina | 19,957 |
| 45828 | Coldwater | 6,404 |
| 45846 | Fort Recovery | 4,644 |
| 45883 | Saint Henry | 4,144 |
| 45882 | Rockford | 2,919 |
| 45860 | Maria Stein | 2,326 |
| 45862 | Mendon | 1,417 |
| 45826 | Chickasaw | 394 |
| 45310 | Burkettsville | 227 |
| 45866 | Montezuma | 117 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 10 ZCTAs in Mercer County, Ohio (US Census).