- Ottadippatti
- Ottaikkālanpatti
- Ottaippatti
- Ottaiyūr
- Ottanāgampatti
- Ottanāgampattipudūr
- Ottanāval Patti
- Ottarājakkāpatti
- Ovalāpuram
- Olaippālaiyam
- Odaikkādu
- Odaiyakāttupudūr
- Odaiyākkavundanpālaiyam
- Odaiyāmpālaiyam
- Odakāttuvalasu
- Odakkalpālaiyam
- Odakkalpālaiyam
- Odakkalpālaiyam
- Odakkāttuvalasu
- Odakkāttuvalasu
- Odanalli
- Odatturai
- Oddapālaiyam
- Odukkadvalasu
- Ogambalikāttuvalasu
- Olagadam
- Olagappakavundanūr
- Olaipālaiyam
- Olaippālaiyam
- Olaippālaiyam