400 (Good et al. 2011).
North West Region, Menchum division, Wum subdivision, Bentsan, Nsun, Biya, Uba, and Bijun villages.
Abar, Biya, Missong, Munken, Ngun. Missong is divergent from the other four dialects as far as mutual intelligibility is concerned.
Mungbam is an acronym made up of the initial syllables of the 5 villages where the language is spoken. No actual autonymn for the language.