Filipinas
Países del mundo
O
- (Province of Aurora) Ontok
- (Province of Capiz) Olalo
- (Province of Iloilo) Omio
- (Province of Negros Oriental) Omagongong
- (Province of Capiz) Olo Pangabat
- (Province of Antique) Opao
- (Province of Aklan) Odiong Sur
- (Province of Aklan) Odiong Norte
- (Province of Zamboanga del Norte) Oro
- (Province of Misamis Oriental) Old Manticao
- (Province of Davao del Sur) Olas
- (Cotabato) Ocasiones
- (Province of Maguindanao) Olas
- (Cotabato) Old Kabacan
- (Province of Sorsogon) Oyango
- (Province of Samar) Obrero
- (Bohol) Old Town Sierra Bullones
- (Bohol) Old Town
- (Province of Zamboanga del Sur) Old Maritao
- (Province of Zamboanga del Sur) Ocapan
- (Province of Tawi-Tawi) Omapuy Dakula
- (Province of Tawi-Tawi) Omapuy Asibi
- (Oriental Mindoro) Oara
- (Province of Davao del Sur) Olagbent
- (Province of Iloilo) Oyungan
- (Eastern Manila District) Oranbo Malinao
- (Province of Catanduanes) Obo
- (Province of Pangasinan) Obong
- (Province of Southern Leyte) Obongobong
- (Bohol) Oac