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- (Tiruchirappalli) Olaiyūr
- (Pudukkottai) Odukapatti
- (Pudukkottai) Odukkūr
- (Pudukkottai) Oliyamangalam
- (Pudukkottai) Osuvampatti
- (Sivaganga) Olippatti
- (Sivaganga) Olugumangalam
- (Sivaganga) Ovalippatti
- (Thanjavur) Orattūr
- (Thanjavur) Ombattuveli
- (Pudukkottai) Olaippāraippatti
- (Pudukkottai) Oduvampatti
- (Pudukkottai) Ovattu Pālampatti
- (Pudukkottai) Onāngudi
- (Madurai) Ottakkadai
- (Madurai) Ottappatti
- (Madurai) Ovalūr
- (Madurai) Ottai Ālangulam
- (Virudhunagar) Ovarkulam
- (Virudhunagar) Odaikulam
- (Thoothukkudi) Olaipatti
- (Madurai) Ottapatti
- (Sivaganga) Okkuppatti
- (Sivaganga) Ottakulam
- (Sivaganga) Odattūr
- (Sivaganga) Ottaividu
- (Virudhunagar) Oruchiranganpattiyūr
- (Virudhunagar) Olaikudi
- (Virudhunagar) Ottakkulam
- (Virudhunagar) Oddankulam