| Sum: | 6,055,909 | % | ||||||
| Sub-Group | Ethnic-Group | Language | Country | Population | Churches | Evangelicals | Evang % | Major Religion |
| Koiri | Bhojpuri | Bhojpuri | India | 3,925,308 | 0% | Hinduism | ||
| Koiri | Magahi | Magahi | India | 1,805,501 | 0% | Hinduism | ||
| Koiri | Hindi | Hindi | India | 212,719 | 0% | Hinduism | ||
| Koiri | Bengali | Bengali | India | 111,883 | 0% | Hinduism | ||
| Koiri | Orisi | Oriya | India | 498 | 0% | Hinduism |