Obadagahadeniya - Obadakotuwa - Obadawatta - Obadayagama - Obbekota - Obberiya - Obedagedere - Obodagedara - Obodakotuwa - Obodayagama - Obokka - Odakkarai - Oddaimavadi - Oddamavadi - Oddankulam - Oddape - Oddare - Oddaruthakulam - Oddaruttakulam - Oddichuddan - Oddiyadimady - Odduchuddan - Oddumadu - Oddupeli - Oddusudan - Oddusuddan - Oggamuwa - Oggomuwa - Ogodapola - Ohiya - Ohomigama - Okanda - Okandapola - Okandeyaya - Okanduwa - Okanmulla - Okanta - Okawala - Okewela - Okewelagoda - Okkampitiya - Okkampitiya-Ihalagama - Okurawa - Okuruwawa - Olabaduwa - Olaboduwa - Olagama - Olaganduwa - Olaganwatta - Olaithoduvai - Olaittoduvai - Olaittoduvl - Old-Peradeniya - Olidivullewa - Oligama - Oligoda - Olimadu - Olindakadawela - Olindankadawala - Olitenna - Oliyamulla - Oliyanyaya - Ollimadu - Olobbawa - Olombewa - Oluara - Olugala - Olugallewa - Olugantota - Olugaskada - Olugaskadawala - Olugaskadawela - Olugollewa - Olukaranda - Olukkiliya - Olukkulam - Olumadu - Olupanduruwewa - Olupeliya - Olupeliyawa - Oluvil - Oluwawatta - Oluwewa - Omalpe - Omantai - Omaragolla - Omatta - Omuna - Onagama - Ondachchimadam - Onegama - Opalagala - Opalgala - Opalgalawatta - Opalla - Opanake - Opata - Opatha - Opathella - Orukmankulama - Oruliyadda - Orulotagama - Orumulacholai - Orutota - Orutotagama - Oruwala - Oruwela - Otagama - Otalawa - Otarakiriwanapola - Otaravadiya - Otarawadiya - Otara-Bemmullegedara - Otara-Tambarawila - Otegama - Othegama - Otherabemmullegedera - Otherakiriwanapola - Othiyamalai - Otiyamalai - Otnapitiya - Ottapanai - Ottapanai-Periya - Ottapanai-Sinna - Ottappuwa - Ottappuwe - Ottapuwe-Galatabendiwewa - Ottukulama - Ottupillama - Oture - Otuwela - Ovilikanda - Ovilla - Ovisa - Ovitipana - Owala - Owalapolwatta - Owala-Kudabage - Owala-Mahabage - Owatta - Owattewela - Owatura - Owilana - Owilikanda - Owilla - Owisa - Owitigala - Owitigama - Owitigamuwa - Owitipana - Owitiwara - Owitiyagala - Oyatenna -