| Zip Code | City | Population ↓ |
|---|---|---|
| 45822 | Celina | 19,779 |
| 45828 | Coldwater | 6,555 |
| 45846 | Fort Recovery | 4,694 |
| 45883 | Saint Henry | 3,849 |
| 45882 | Rockford | 2,865 |
| 45860 | Maria Stein | 2,618 |
| 45862 | Mendon | 1,314 |
| 45826 | Chickasaw | 302 |
| 45310 | Burkettsville | 292 |
| 45866 | Montezuma | 104 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Mercer County, Ohio (US Census).