| Language | Population | Bloc | Family | Cluster | Band | |
|---|---|---|---|---|---|---|
| ● Terei | 37,200 | East Papuan | Bougainville | East Bougainville | Buin | |
| ● Naasioi | 25,100 | East Papuan | Bougainville | East Bougainville | Nasioi | |
| ● Siwai | 8,720 | East Papuan | Bougainville | East Bougainville | Buin | |
| ● Sibe | 6,610 | East Papuan | Bougainville | East Bougainville | Nasioi | |
| ● Uisai | 4,700 | East Papuan | Bougainville | East Bougainville | Buin | |
| ● Simeku | 3,760 | East Papuan | Bougainville | East Bougainville | Nasioi | |
| ● Koromira | 3,130 | East Papuan | Bougainville | East Bougainville | Nasioi | |
| ● Oune | 1,250 | East Papuan | Bougainville | East Bougainville | Nasioi | |
| ● Daantanai' | 580 | East Papuan | Bougainville | East Bougainville | Nasioi |