Itneg is a general term that refers to speakers of Itneg languages who reside on Luzon in the Philippines. The Summer Institute of Linguistics lists four Itneg languages: Binongan (Tinggian, Tinguian, Tinngguian), Inlaod, Masadiit, and Southern. In 1975 the total number of Itneg speakers was 50,000, although almost all were bilingual in Ilocano. Itneg-speaking groups have been in contact with various neighboring groups such as the Bontok, Kalingas, Overseas Chinese traders, and Ilocano for some time, and today are assimilated into Ilocano society.
LeBar, Frank M. (1975). "Tinggian" and "Apayo." In Ethnic Groups of Insular Southeast Asia, edited by Frank M. LeBar. Vol. 2, Philippines and Formosa, 95-100. New Haven: HRAF Press.