ON MARCH 11, 1966, the old Mountain Province was divided into four separate provinces, namely:
• Mountain Province, with Bontoc as the capital
• Benguet, with La Trinidad as the capital
• Kalinga-Apayao, with Tabuk as the capital and Ifugao, with Lagawe as the capital.
The old Mountain Province used to belong partly to the Ilocos Region (Region 1) and the rest to the Cagayan Valley (Region 2).
With the passing of Republic Act No. 6766 of October 23, 1989, Benguet, Mountain Province, Ifugao, Abra and Kalinga-Apayao, and the chartered City of Baguio, were constituted into the Cordillera Administrative Region.
On February 14, 1995, through Republic Act No. 7878, Kalinga-Apayao was further partitioned into 2 separate provinces, Kalinga with capital Tabuk, and Apayao with Kabugao as its capital.
