Zip Code | City | Population |
|---|---|---|
| 45875 | Ottawa | 11,052 |
| 45830 | Columbus Grove | 5,608 |
| 45856 | Leipsic | 5,245 |
| 45831 | Continental | 3,601 |
| 45844 | Fort Jennings | 2,878 |
| 45877 | Pandora | 2,348 |
| 45827 | Cloverdale | 2,043 |
| 45853 | Kalida | 1,553 |
| 45876 | Ottoville | 960 |
| 45893 | Vaughnsville | 159 |
| 45864 | Miller City | 156 |
| 45815 | Belmore | 94 |
| 45848 | Glandorf | 92 |