Onnamu-kol Onp'o Onp'o Onp'o-ni Onp'o-ri Onp'yong Onp'yong-ni Onsekiho Onsu Onsu Onsu-ri Onsu-ri Onsu-ri Onsu-ri Onsu-ri Onsugok Onsui Onsuiri Ont'am-ni Ontoruho Onyang Onyang Onyo Onyoul Ooejang Ook Oong-ni Opcha-dong Opcha-ri Op'o Op'o Oppat Oppat Oppawi Oppol Optong Optong-ni Op'yong-dong Ora-ri Orak-tong Oral-li Oram-ni Oran-chin Oran-ni Oran-ri Oranchin-ko Orang-ni Orang-ni Orangdo-ri Oranjin