| NAME WISE SORTED | CODE WISE SORTED | |||||
| FULL NAME | STATE | CODE | CODE | FULL NAME | STATE | |
| OAJGHAT | HIMACHAL PARDESH | OA2 | OA2 | OAJGHAT | HIMACHAL PARDESH | |
| OAT (SAINJ) | ASSAM | OA3 | OA3 | OAT (SAINJ) | ASSAM | |
| ODHAV (GUJRAT) | GUJRAT | ODH | ODH | ODHAV (GUJRAT) | GUJRAT | |
| OKHLA PHASE DELHI - PHASE II | DELHI | OKD | OKB | OKHLA PHASE DELHI - PHASE III | DELHI | |
| OKHLA PHASE DELHI - PHASE III | DELHI | OKB | OKD | OKHLA PHASE DELHI - PHASE II | DELHI | |
| OMKARESHWAR | MADHYA PRADESH | OM2 | OM2 | OMKARESHWAR | MADHYA PRADESH | |
| ONGOLE (AP) | ANDHRA PARDESH | ONO | ONO | ONGOLE (AP) | ANDHRA PARDESH | |
| ORAI | UTTERPRADESH | OR2 | OR2 | ORAI | UTTERPRADESH | |
| OSMANABAD | MAHARASHTRA | OS2 | OS2 | OSMANABAD | MAHARASHTRA | |
| OTTAPALAM | KERALA | OT2 | OT2 | OTTAPALAM | KERALA | |
| OTTAPALAM (KERLA) | KERALA | OTA | OTA | OTTAPALAM (KERLA) | KERALA | |