30,000 (1984 SIL).
Luzon, central; Nueva Vizcaya Province, Bagabag, Bayombong, and Solano municipalities; into Ifugao Province, north of Magat Reservoir; separate small enclave, Isabela Province, along middle branch of Cagayan river, Tuboc area.
Also use Ilocano [ilo].
A lowland group. Ethnonym: Gaddang for those in Nueva Vizcaya; Cagayan, for those in central Isabela. Christian.