| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Tshalumthang, Gangtok | 737113 |
| Postal/ZIP Codes in Tumen Forest Block, Gangtok | 737134, 737138 |
| Postal/ZIP Codes in Tumin, Gangtok | 737134 |
| Postal/ZIP Codes in Tumlabung, Gangtok | 737135 |
| Postal/ZIP Codes in Upper Burtuk, Gangtok | 737101 |
| Postal/ZIP Codes in Upper Chandmari, Gangtok | 737103 |
| Postal/ZIP Codes in Upper Sicheygaon, Gangtok | 737101 |
| Postal/ZIP Codes in Upper Tathangchen, Gangtok | 737103 |
| Postal/ZIP Codes in West Pendam, Gangtok | 737134 |
| Postal Codes in East Sikkim | |
|---|---|
| Postal/ZIP Codes in Gangtok, East Sikkim | |
| Postal/ZIP Codes in Pakyong, East Sikkim | |
| Postal/ZIP Codes in Rongli, East Sikkim | |