| Code | Name | Region |
|---|---|---|
| INIXS | Silchar | |
| INSIL | Siliguri | WB |
| INSIV | Silvassa | DN |
| INSIM | Sima/navabunder | GJ |
| INSHP | Simbhour Port | |
| INSLV | Simla | |
| INSMR | Simor | GJ |
| INSEH | Sehore | MP |
| INSLU | Selu | MH |
| INSHW | Sendhwa | MP |
| INSHH | Shahada | MH |
| INSHA | Shahapur | MH |
| INSHD | Shahdol | MP |
| INSJN | Shahjahanpur | UP |
| INSHJ | Shajapur | MP |
| INSH2 | Shamli | UP |
| INHIR | Shb Icd/surat | GJ |
| INSBZ | Shella Bazar | ML |
| INSHE | Sheopur | MP |
| INNTL | Sherathang Lcs | SK |
| INSRI | Shertallai | KL |
| INSHL | Shillong | |
| INSMK | Shimoga | KA |
| INSHI | Shirola | KA |
| INSHU | Shirur | MH |
| INSHV | Shivpuri | MP |
| INSSE | Sholapur | |
| INHPI | Sandkhera Icd/kashipur | UT |
| INJPW | Sanganer | RJ |
| INSAG | Sangli | MH |
| INSAN | Sangrur | PB |
| INDBS | Santa-sez/muppireddipally | AP |
| INCAS | Sapl Sez/ganjam | OR |
| INSCH | Sap-sez/surat | GJ |
| INSAR | Sardar | AN |
| INSRL | Saroli | RJ |
| INSTM | Satara | MH |
| INSTA | Satara | MH |
| INSTN | Satna | MP |
| INSTP | Satpati | MH |
| INSTY | Satyavedu | TN |
| INTSM | Sawai Madhopur | RJ |
| INMUC | Scpl Sez/mulund | MH |
| INHBB | Sdpl Sez/bangalore | KA |
| INCBS | Se&c Ltd-sez/coimbatore | TN |
| INBRS | Se&c-ltd-sez/waghodia | GJ |
| INUND | Secunderabad | AP |
| INRUD | Rudrapur | UT |
| INRPN | Rupnagar | PB |
| INRUP | Rupsi |