O
- (Hambantota District) Okandeyaya
- (Hambantota District) Ovilanagoda
- (Hambantota District) Omara
- (Galle District) Opatha South
- (Galle District) Opata West
- (Galle District) Olagoda
- (Galle District) Oilyapola
- (Matara District) Olakanda
- (Galle District) Olaganduwa
- (Galle District) Oganagoda
- (Galle District) Obadagoda
- (Galle District) Okanduyaya
- (Hambantota District) Obadagahadeniya
- (Galle District) Obadawatta
- (Matara District) Owitigamuwa
- (Hambantota District) Okawela
- (Galle District) Olagama
- (Galle District) Olagama
- (Galle District) Olaganduwa
- (Galle District) Oligoda
- (Hambantota District) Oluara North
- (Matara District) Olupeliya
- (Galle District) Opata
- (Galle District) Opata East
- (Galle District) Opatha
- (Matara District) Oture
- (Hambantota District) Owilana