They are spoken in the interior highlands of Northern Luzon in the Cordillera Central mountain range.
[1][2] Reid (1974) classifies the Central Cordilleran languages as follows:[1] Reid (1991) has suggested that the Central Cordilleran languages are most closely related to the Southern Cordilleran languages,[3] which is supported by numerous exclusively shared innovations listed by Himes (2005).
[2] Proto-Central Cordilleran has been reconstructed by Reid (1974; 2006).
[1][4] Proto-Central Cordilleran can be reconstructed with phonemic stress.
The comparison table (taken from Reid (1974)[1] illustrates the correspondences between the Central Cordilleran languages, including inherited vocabulary as well as Central Cordilleran innovations.