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- (Thiruvallur) Ondikuppam
- (Tiruvannamalai) Ottiyantangal
- (Tiruvannamalai) Odalavādi
- (Tiruvannamalai) Ogūr
- (Tiruvannamalai) Otteri
- (Tiruvannamalai) Odaiyenandal
- (Tiruvannamalai) Olaippādi
- (Villupuram) Oddampattu
- (Vellore) Olalai
- (Vellore) Olugūr
- (Tiruvannamalai) Olagampattu
- (Tiruvannamalai) Oddantāngal
- (Tiruvannamalai) Ogaiyūr
- (Villupuram) Odaiyāntāngal
- (Villupuram) Oduvankuppam
- (Villupuram) Odayanattam
- (Villupuram) Odiyattūr
- (Villupuram) Oddampattu
- (Villupuram) Olagalampūndi
- (Vellore) Oclicheri
- (Kancheepuram) Olukkolpattu
- (Tiruvannamalai) Olukkavākkam
- (Kancheepuram) Orīkkai
- (Tiruvannamalai) Olappākkam
- (Tiruvannamalai) Oddarnattam
- (Kancheepuram) Oddantāngal
- (Kancheepuram) Olukarai
- (Tiruvannamalai) Oddapālaiyam
- (Tiruvannamalai) Oddapālaiyam
- (Tiruvannamalai) Osūr