O
- (Cuddalore) Oraiyūr
- (Villupuram) Otterippālaiyam
- (Cuddalore) Odākkanallūr
- (Cuddalore) Odaiyūr
- (Cuddalore) Oddarpālaiyam
- (Cuddalore) Oblānjimedu
- (Cuddalore) Orattūr
- (Cuddalore) Odaiyūr
- (Nagapattinam) Odavandāngudi
- (Nagapattinam) Olaiyāmputtūr
- (Cuddalore) Odalappattu
- (Theni) Odaipatti
- (Theni) Okkaraipatti
- (Salem) Ondimāmaruttuppatti
- (Salem) Ondivīranūr
- (Salem) Oddateruvu
- (Salem) Omakavundanpatti
- (Salem) Oddateruvu
- (Salem) Olavakkodu
- (Nagapattinam) Olugamangalam
- (Thanjavur) Ottangādu
- (Salem) Omayanūr
- (Salem) Odayārpatti
- (Namakkal) Olaippālaiyam
- (Namakkal) Oduvankurichchi
- (Namakkal) Oviyampālaiyam
- (Namakkal) Olurappatti
- (Namakkal) Olaippālaiyam
- (Karur) Odaiyūr
- (Namakkal) Oravandūr