| Sum: | 21,931 | 26 | 2,349 | 10.71% | ||||
| Sub-Group | Ethnic-Group | Language | Country | Population | Churches | Evangelicals | Evang % | Major Religion |
| Cook Islands Maori | Cook Islands Maori | Rarotongan | Cook Islands | 16,800 | 17 | 1,670 | 9.94% | Christianity |
| Rakahanga-Manihiki | Rakahanga-Manihiki | Rakahanga-manihiki | Cook Islands | 2,714 | 5 | 408 | 15.03% | Christianity |
| Bukabukan | Pukapukan | Pukapuka | Cook Islands | 878 | 2 | 93 | 10.59% | Christianity |
| Anglo-New Zealander | Anglo-New Zealander | English | Cook Islands | 700 | 1 | 55 | 7.86% | Christianity |
| Penrhyn | Penrhyn | Penrhyn | Cook Islands | 644 | 1 | 93 | 14.44% | Christianity |
| Niuean | Niuean | Niue | Cook Islands | 195 | 0 | 30 | 15.38% | Christianity |