| Place | Postal Code |
|---|---|
| Bahal Batu I, Siborong-borong | 22474 |
| Bahal Batu II, Siborong-borong | 22474 |
| Bahal Batu III, Siborong-borong | 22474 |
| Hutabulu, Siborong-borong | 22474 |
| Lobu Siregar I, Siborong-borong | 22474 |
| Lobu Siregar II, Siborong-borong | 22474 |
| Lumban Tonga Tonga, Siborong-borong | 22474 |
| Paniaran, Siborong-borong | 22474 |
| Parik Sabungan, Siborong-borong | 22474 |
| Pasar Siborong Borong, Siborong-borong | 22474 |
| Pohan Jae, Siborong-borong | 22474 |
| Pohan Julu, Siborong-borong | 22474 |
| Pohan Tonga, Siborong-borong | 22474 |
| Siaro, Siborong-borong | 22474 |
| Siborong-Borong I, Siborong-borong | 22474 |
| Siborong-Borong II, Siborong-borong | 22474 |
| Sigumbang, Siborong-borong | 22474 |
| Silait-Lait, Siborong-borong | 22474 |
| Sitabotabo, Siborong-borong | 22474 |
| Sitabotabo Toruan, Siborong-borong | 22474 |
| Sitampurung, Siborong-borong | 22474 |