The Momo languages are a branch of the Grassfields languages

Grassfields languages

The Grassfields or Grassfields Bantu languages, spoken in the Western grassfields of Cameroon, are a branch of Benue–Congo and a sister group to the Bantu languages...

 spoken in the Western grassfields of Cameroon

Cameroon

Cameroon, officially the Republic of Cameroon , is a country in west Central Africa. It is bordered by Nigeria to the west; Chad to the northeast; the Central African Republic to the east; and Equatorial Guinea, Gabon, and the Republic of the Congo to the south. Cameroon's coastline lies on the...

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The languages are:

Meta'

Meta' language

Meta’ is a Grassfields Bantu language of Cameroon. The Moghamo variety is perhaps divergent enough to be considered a distinct language....

 (Moghamo), Mundani, Ngamambo, Ngie

Ngie language

Ngie is a Grassfields Bantu language of Cameroon. A variety called Mengum is only 56% lexically similar, and so should perhaps be considered a distinct language....

 (Mengum), Ngoshie, Ngwo

Ngwo language

The Ngwo speak a Grassfields Bantu language of Cameroon. The Konda and Basa varieties are perhaps divergent enough to be considered distinct languages.-External links:****...

 (Basa, Konda), Njen, Amasi

Ethnologue 16 adds Manka, but that is a Southwest Grassfields (West Momo) language.

Blench (2010) notes there is little evidence that Momo belongs in Grassfields as it has been traditionally classified. (The erstwhile West Momo languages are clearly in the Grassfields family). Momo may actually be closer to the poorly established Tivoid

Tivoid languages

The Tivoid languages are a group of African languages, a sub-family of the Southern Bantoid group, spoken in parts of Nigeria and Cameroon.The majority are threatened with extinction. The largest of these languages by far is the Tiv language for which the group is named, with some 2 million speakers...

group, though that may be an effect of contact.