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- (Kollam) Odanāvattam
- (Thiruvananthapuram) Odetti
- (Pattanamtitta) Olikkal
- (Pattanamtitta) Omallūr
- (Palakkad district) Odugampallampudūr
- (Palakkad district) Oddansahlai
- (Palakkad district) Odumbumedu
- (Palakkad district) Orukumbankutti
- (Kollam) Oyūr
- (Palakkad district) Oduvangād
- (Ernākulam) Okkal
- (Thrissur District) Olakara
- (Thrissur District) Orlassheri
- (Thrissur District) Ollukara
- (Thrissur District) Ottupāra
- (Kāsaragod District) Otemule
- (Alappuzha) Ochira
- (Malappuram) Olakara
- (Thrissur District) Ollūr
- (Pattanamtitta) Oonnukal
- (Kollam) Ottapilāyu
- (Kollam) Ola Turuttu
- (Kollam) Olayilseri
- (Kollam) Olikkara
- (Kollam) Olaturuttu
- (Thrissur District) Oozhathum Kadava
- (Kottayam) Olasa
- (Palakkad district) Ottapārapudūr