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Area Dialing Codes -
India STD Codes
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| City/Town | State | STD Code |
| O D Cheervu | Andhra Pradesh | 08494588 |
| O Mittur | Karnataka | 0815984 |
| Oachghat | Himachal Pradesh | 0179252 |
| Oaodaballapur | Karnataka | 08119 |
| Obalapur | Karnataka | 08190665 |
| Obara | UPE | 05445 |
| Obedullaganj | Madhya Pradesh | 07484 |
| Obri | Rajasthan | 02966252 |
| Obulonaripalli | Andhra Pradesh | 08566 |
| Ochhan | Gujarat | 02641 |
| Ochira | Kerala | 047569 |
| Odagaon | Orissa | 0675383 |
| Odaipatti | Tamil Nadu | 0455320 |
| Odakhli | Kerala | 0484658 |
| Oddanchatram | Tamil Nadu | 04553 |
| Ode | Gujarat | 0269282 |
| Odeyarpalya | Karnataka | 0822462 |
| Odgi | Chhattisgarh | 07773 |
| Odhan | Harayana | 01696 |
| Odiyathur | Tamil Nadu | 04146 |
| Odlabari | West Bengal | 03562 |
| Odugathur | Tamil Nadu | 04171 |
| Oel | UPE | 05872 |
| Ognaj | Gujarat | 02717642 |
| Ohighcheria | Andhra Pradesh | 08539470 |
| Ohone | Punjab | 0187232 |
| Oinam | NE | 03879 |
| Okha | Gujarat | 028993 |
| Okkanedukeelaiyur | Tamil Nadu | 04372 |
| Okkur | Tamil Nadu | 0457533 |
| Olagadam | Tamil Nadu | 04256 |
| Olakkur | Tamil Nadu | 04147 |
| Olapalayam | Tamil Nadu | 0425776 |
| Olatpur | Orissa | 067245 |
| Olavakkot | Kerala | 04915 |
| Olgnalrod | Tamil Nadu | 04256 |
| Oliya | Gujarat | 02845864 |
| Ollur | Kerala | 048787 |
| Olpad | Gujarat | 026212 |
| Omallur | Kerala | 0473 |
| Omalur | Tamil Nadu | 04290 |
| Omerga | Maharashtra | 02475 |
| Ompi | NE | 03825 |
| Ond | Maharashtra | 02164 |
| Onda | West Bengal | 03242 |
| Ongallur | Kerala | 04927 |
| Ongole | Andhra Pradesh | 08592 |
| Oni | Maharashtra | 02353282 |
| Onipeta | Andhra Pradesh | 08564 |
| Onjal | Gujarat | 02637 |
| Onnupuram | Tamil Nadu | 04173 |
| Oonkul | Kerala | 04855 |
| Ootpur | Himachal Pradesh | 01908770 |
| Ooty | Tamil Nadu | 0423 |
| Ooty | Andhra Pradesh | 08553 |
| Opm Amlai | Madhya Pradesh | 07652 |
| Oppilan | Tamil Nadu | 04576 |
| Orai | UPE | 0516 |
| Orai Indl Area | UPE | 051688 |
| Oran | Gujarat | 02770 |
| Orang | Assam | 03712 |
| Oras | Maharashtra | 023628 |
| Orathur | Tamil Nadu | 04144 |
| Orathy | Tamil Nadu | 04115411 |
| Oravakallu | Andhra Pradesh | 08518 |
| Orcha | Madhya Pradesh | 07680 |
| Ordinance Factory | Madhya Pradesh | 07572 |
| Orgram | West Bengal | 03452 |
| Orthanad | Tamil Nadu | 04372 |
| Oruvandhur Pudhur | Tamil Nadu | 04286 |
| Osian | Rajasthan | 02922 |
| Osian(e) | Rajasthan | 02927 |
| Osmanabad | Maharashtra | 02472 |
| Osmannagar | Maharashtra | 02466 |
| Osor | Tamil Nadu | 0418343 |
| Ostar | Orissa | 06727 |
| Otha | Gujarat | 02844 |
| Othakadai | Tamil Nadu | 0452 |
| Othian | Punjab | 01858 |
| Othihal | Karnataka | 08424643 |
| Ottankadu | Tamil Nadu | 0437378 |
| Ottapalam | Kerala | 04926 |
| Ottapidaram | Tamil Nadu | 046186 |
| Ottasekharamangal | Kerala | 0471 |
| Ottu | Harayana | 01698752 |
| Otur | Maharashtra | 02132 |
| Oupada | Orissa | 06782 |
| Outsarangapalle | Andhra Pradesh | 08753 |
| Ovari | Tamil Nadu | 0463777 |
| Owk | Andhra Pradesh | 08515686 |
| Oyan | NE | 0368 |
| Ozar | Maharashtra | 025337 |
| Ozar(junnar) | Maharashtra | 02132 |
| Ozarde | Maharashtra | 02167 |
| Ozili | Andhra Pradesh | 08624567 |
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Area (STD) Codes 
