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- (Virudhunagar) Ottankulam
- (Rāmanāthapuram) Ottakkudi
- (Virudhunagar) Ottaippuli
- (Rāmanāthapuram) Olugupuli
- (Rāmanāthapuram) Ottavīdu
- (Rāmanāthapuram) Ottavīdu
- (Rāmanāthapuram) Ochchatevankottai
- (Sivaganga) Ogampatti
- (Sivaganga) Ottanattam
- (Sivaganga) Orupokki
- (Sivaganga) Oiyavandan Pudukudi
- (Sivaganga) Oiyavandān
- (Sivaganga) Odaikkulam
- (Sivaganga) Ochchantattu
- (Sivaganga) Odaiyanūr
- (Sivaganga) Ottavidu
- (Sivaganga) Olagamaniendal
- (Rāmanāthapuram) Odaikulam
- (Rāmanāthapuram) Oyyanendal
- (Rāmanāthapuram) Ottaivīdu
- (Rāmanāthapuram) Orivayal
- (Rāmanāthapuram) Odakkulam
- (Rāmanāthapuram) Oppilān
- (Sivaganga) Odaiyakkandudi
- (Sivaganga) Odaiyakkankudi
- (Sivaganga) Orasūr
- (Rāmanāthapuram) Ochchanvayal
- (Sivaganga) Orattūr
- (Rāmanāthapuram) Oyikkottai
- (Rāmanāthapuram) Odaikkāl