| ISO 639-3 | art-001 |
| opo | |
| ISO 639-3 Reference Names | art-289 | Opao |
| ISO 639-3 Print Names | art-290 | Opao |
| ISO 639-3 Inverted Names | art-291 | Opao |
| Ethnologue Primary Language Names | art-323 | Opao |
| Glottolog Languoid Names | art-326 | Opao |
| Glottocode | art-327 | opao1240 |
| Glottolog Primary Key | art-328 | 24488 |
| Ethnologue Language Names | art-330 | Opao |
| English | eng-000 | Opao |