L1 users: 55,000 (2009 PCS), decreasing. 10,000 monolinguals (2015 P. Porodong, F. Akiam). Ethnic population: 60,000 (2010 census).
Sabah: Beluran, Kota Marudu, Kudat, and Pitas districts.
Gandahon, Gonsomon, Nuluw, Pilapazan (Central Rungus, Rungus Tanga). Gonsomon and Nuluw most distinctive dialects. Gandahon is less distinct. Pilapazan uses elements of the other three dialects. Lexical similarity among dialects within 86%–96%.
90% L1 speakers. Mixed use: Home, Friends, Religion, Work. Some children; all adults and elderly. Positive attitudes. Most also use Sabah Malay [msi]. Some also use Standard Malay [zsm]. A few also use Hakka Chinese [hak], Iranun [ilm], Kadazan Dusun [dtp], Kimaragang [kqr], Tombonuo [txa]. Used as L2 by Hakka Chinese [hak], Iranun [ilm], Kadazan Dusun [dtp], Kimaragang [kqr], Tombonuo [txa].
Latin script [Latn].
Reside on the Bengkoka and Kudat peninsulas surrounding Marudu bay and identify themselves by which side of the bay they come from. Self-identify as Momogun and have complex internal social and ethnic relationships (Appell 1965). There is a strong sense of Rungus ethnic identity across all dialect groups. Christian, Muslim, traditional religion.