| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Donja Međiđa, Gradačac | 76257 |
| Postal/ZIP Codes in Gradačac, Gradačac | 76250 |
| Postal/ZIP Codes in Međiđa Donja, Gradačac | 76257 |
| Postal/ZIP Codes in Srnice, Gradačac | 76258 |
| Postal/ZIP Codes in Vučkovci, Gradačac | 76254 |
| Postal/ZIP Codes in Zelinja, Gradačac | 76259 |