City STD Code City STD Code
Ooty 0423 O Mittur 0815984
Odakhli 04859 Ochira 047569
Ollur 048787 Ode 0261282
Ongole 08592 Oonkul 04855
Ooty 0423 Orai 05162
Osmanabad 02472 Ottapalam 4926