| 75001 | Benabena | ó | | | Scott (1978) | |
| 75013 | Siane | ô | | | Scott (1978) | |
| 182415 | Sinsauru | ɔː | | | Z'graggen (1980) | yes |
| 194334 | Biyom | ɔː | | | Z'graggen (1980) | yes |
| 126722 | Rapting | oa | | | Z'graggen (1980) | yes |
| 182451 | Bongu | oa | | | Z'graggen (1980) | yes |
| 126714 | Kein | oa | | | Z'graggen (1980) | yes |
| 202046 | Hiri Motu | ɔɩbɛ | | | SIL (1975) | |
| 145459 | Yaben | oe | | | Z'graggen (1980) | yes |
| 212990 | Awa | oe | | | SIL (1976) | |
| 182416 | Asas | oɛ | | | Z'graggen (1980) | yes |
| 182441 | Ogea | oɛ | | | Z'graggen (1980) | yes |
| 182442 | Uyajitaya | oɛ | | | Z'graggen (1980) | yes |
| 126743 | Wagi | oɛ | | | Z'graggen (1980) | yes |
| 145447 | Bepour | ɔɛ | | | Z'graggen (1980) | yes |
| 217716 | Uare | 'ɔʔɛ | | | SIL (1988) | |
| 126724 | Samosa | oh | | | Z'graggen (1980) | yes |
| 182417 | Sausi | oi | | | Z'graggen (1980) | yes |
| 230705 | Kol | 'oia | | | SIL (1981) | |
| 126715 | Sihan | ois | | | Z'graggen (1980) | yes |
| 145442 | Maia (Pila Dialect) | ole | | | Z'graggen (1980) | yes |
| 182449 | Male | ɔndɛ | | | Z'graggen (1980) | yes |
| 234532 | Alekano | oo | | | SIL (1965) | |
| 234189 | Alekano (Kotuni Dialect) | oo | | | SIL (1975) | |
| 218868 | Yaweyuha | oo | | | SIL (1965) | |
| 75015 | Yaweyuha | oo | | | Scott (1978) | |
| 221159 | Tokano | oo | | | SIL (1965) | |
| 75003 | Proto-Eastern-Central | *(oo) | | | Scott (1978) | |
| 75009 | Gende | o'o | | | Scott (1978) | |
| 182427 | Yabong | oʔo | | | Z'graggen (1980) | yes |
| 194335 | Tauya | oʔo | | | Z'graggen (1980) | yes |
| 234891 | Alekano (Notofana Dialect) | ō-ō | | | SIL (1976) | |
| 74997 | Dano (Asaro Dialect) | óo | | | Scott (1978) | |
| 234363 | Alekano (Wanima Dialect) | oó | | | SIL (1962) | |
| 234010 | Alekano (Wanima Dialect) | oó | | | SIL (1975) | |
| 75008 | Alekano | oó | | | Scott (1978) | |
| 228824 | Ura | ɔɔᵘ | | | SIL (1971) | |
| 228317 | Ura | ɔɔᵘ | | | SIL (1970) | |
| 234688 | Alekano (Kefamo Dialect) | ŏ oq | | | SIL (1975) | |
| 199875 | Nuk (Tamben Dialect) | oq | | | Retsema et al. (2009) | |
| 238541 | Angoram | orakpe | | | SIL (1975) | |
| 194322 | Moresada | ore | | | Z'graggen (1980) | yes |
| 145445 | Miani | or̃ɛ | | | Z'graggen (1980) | yes |
| 202869 | Setaman (Ngisokabip Dialect) | ou | | | Van Cott and Spencer (2010) | |
| 202747 | Setaman (Seltamin Dialect) | ou | | | Van Cott and Spencer (2010) | |
| 182445 | Rerau | ou | | | Z'graggen (1980) | yes |
| 182418 | Sausi | ou | | | Z'graggen (1980) | yes |
| 203006 | Setaman (Baktamin Dialect) | ɔu | | | Van Cott and Spencer (2010) | |
| 228485 | Abu' Arapesh | oʔuʔɛ | | | SIL (1975) | |
| 182419 | Kesawai | oːwai | | | Z'graggen (1980) | yes |
