| Locality | Post Code |
|---|---|
| Ackworth, Warren | 50001 |
| Avon, Warren | 50047 |
| Avon Lake, Warren | 50047 |
| Carlisle, Warren | 50047 |
| Churchville, Warren | 50211 |
| Cool, Warren | 50125 |
| Cumming, Warren | 50061 |
| Hartford, Warren | 50118 |
| Indianola, Warren | 50125 |
| Jamison, Warren | 50210 |
| Lacona, Warren | 50139 |
| Lakewood, Warren | 50211 |
| Liberty, Warren | 50210 |
| Liberty Center, Warren | 50145 |
| Martensdale, Warren | 50160 |
| Medora, Warren | 50125 |
| Milo, Warren | 50166 |
| New Virginia, Warren | 50210 |
| Newbern, Warren | 50139 |
| Norwalk, Warren | 50211 |
| Orillia, Warren | 50061 |
| Palmyra, Warren | 50047 |
| Prole, Warren | 50229 |
| Saint Charles, Warren | 50240 |
| Saint Marys, Warren | 50241 |
| Sandyville, Warren | 50001 |