| Code | Name | Region |
|---|---|---|
| INSOL | Solapur | MH |
| INSNB | Sonabarsa | DL |
| INSNL | Sonauli | UP |
| INSUB | Sonepur | OR |
| INSON | Sonipat | HR |
| INSSI | South Sikkim | SK |
| INTBP | Spipl Sez/perungalathur | TN |
| INAIR | Sppl Sez/thane | MH |
| INGNS | Srehpl-sez/gandhinagar | GJ |
| INTAS | Sri City Pvt Ltd-sez/satyavedu | AP |
| INMUK | Sri Muktsar Sahib | PB |
| INSMP | Srimantapur | TR |
| INSXR | Srinagar | JK |
| INSRP | Sriperumbudur | TN |
| INTNS | Ssl Sez/tuticorin | TN |
| INSKN | St Kabir Nagar | UP |
| INKNM | Startrack | UP |
| INSBH | Sinbhour | GJ |
| INSIN | Sindhudurg | MH |
| INSIR | Singanallur | TN |
| INSNG | Singhabad | WB |
| INSLI | Singrauli | MP |
| INNKI | Sinnar | MH |
| INHSI | Sipc Sez/krishnagiri | TN |
| INVLR | Sipc Sez/vellore | TN |
| INTEN | Sipcot-gangaikondan-sez/tirunelveli | TN |
| INCJS | Sipcot-hi-tech-sez/sriperumbudur | TN |
| INCJO | Sipcot-hi-tech-sez-oragadam/sriperumbudur | TN |
| INPYS | Sipcot-sez/erode | TN |
| INCSP | Sipl Sez/kancheepuram | TN |
| INPSI | Sipl Sez/pune | MH |
| INSIO | Sirohi | RJ |
| INSPR | Sirpur | AN |
| INSTI | Sitai | WB |
| INSIT | Sitapur | UP |
| INSTG | Sitarganj | UP |
| INSVK | Sivakasi | TN |
| INSHR | Sholinghur | TN |
| INSHN | Shopian | JK |
| INSWD | Shriwardhan | MH |
| INSIB | Sibsagar | AS |
| INHDD | Sidcul Icd/pantnagar | UT |
| INSAP | Siddapur | KA |
| INSDD | Siddharthnagar | UP |
| INSID | Sidhi | MP |
| INSHO | Sihor | MP |
| INSIK | Sika | GJ |
| INSKR | Sikar | RJ |
| INSKK | Sikkim | AN |
| INSTF | Sikta Lcs | BR |