| EXCHANGE | SDCA | NSDCODE | NUMBERING |
| Ambalamukku | Trivandrum | 0471 | 243,253xxxx |
| Anayara | Trivandrum | 0471 | 274xxxx |
| Balaramapuram | Trivandrum | 0471 | 240xxxx |
| Central OCB | Trivandrum | 0471 | 232,233xxxx |
| Chenkottokonam | Trivandrum | 0471 | 271xxxx |
| Kaimanam | Trivandrum | 0471 | 249xxxx |
| Kaithamukku(5ESS) | Trivandrum | 0471 | 247,257xxxx |
| Kaithamukku(AXE) | Trivandrum | 0471 | 246xxxx |
| Karyavattom | Trivandrum | 0471 | 241xxxx |
| Kudappanakunnu | Trivandrum | 0471 | 273xxxx |
| Manacaud | Trivandrum | 0471 | 245xxxxx |
| MedicalCollege | Trivandrum | 0471 | 244&255xxxx |
| Menamkulam | Trivandrum | 0471 | 270xxxx |
| Nemom | Trivandrum | 0471 | 239xxxx |
| Niyamasabha | Trivandrum | 0471 | 230xxxx |
| Paruthippara | Trivandrum | 0471 | 253&254xxxx |
| Poojappura | Trivandrum | 0471 | 234xxxx |
| Sanghumughom | Trivandrum | 0471 | 250xxxx |
| Sreekaryam | Trivandrum | 0471 | 259xxxx |
| Technopark | Trivandrum | 0471 | 270xxxx |
| Thirumala | Trivandrum | 0471 | 235xxxx |
| Thiruvallam | Trivandrum | 0471 | 238xxxx |
| Vattiyurkkavu | Trivandrum | 0471 | 236xxxx |
| Vazhayila | Trivandrum | 0471 | 237xxxx |
| Vellaikadavu | Trivandrum | 0471 | 237xxxx |
| Vellayambalam | Trivandrum | 0471 | 231,272xxxx |
