The Bongo–Bagirmi languages are for the most part poorly studied, and there is little agreement as to their internal classification.
The table below is taken from Lionel Bender, as summarized in Blench (2000).
Sinyar and Fongoro may not be Bongo–Bagirmi or even Central Sudanic languages.
Boyeldieu (2006) considers the homelands (Urheimats) of the language groups to be as follows.
[1] The Bongo–Bagirmi languages in the east are closer to other Central Sudanic languages, while the Sara languages in the west have diverged more from the typical Central Sudanic typological profile due to contact with Ubangian and other languages.