O
| Place name | Postal code |
|---|---|
| Obrenovac | 11500 |
| Obrež | 22417 |
| Obrež | 37266 |
| Obrovac | 21423 |
| Odžaci | 25250 |
| Ogar | 22416 |
| Omoljica | 26230 |
| Oparić | 35267 |
| Opovo | 26204 |
| Orane | 16233 |
| Orašac | 34308 |
| Orešković | 24344 |
| Oreškovica | 12308 |
| Orid | 15213 |
| Orlovat | 23263 |
| Orom | 24207 |
| Osanica | 12317 |
| Osečina | 14253 |
| Osipaonica | 11314 |
| Osnić | 19378 |
| Ostojićevo | 23326 |
| Oštrelj | 19226 |
| Ostrovica | 18312 |
| Ostružnica | 11251 |
| Ovča | 11212 |
| Ovčar Banja | 32242 |
Read more about this topic: List Of Postal Codes In Serbia