Since 1998, the province has been represented in the lower house of the Congress of the Philippines through the separate lone congressional districts of Apayao and Kalinga.
Prior to gaining separate representation, areas formerly under the jurisdiction of Kalinga-Apayao were represented under the undivided Mountain Province (1917–1969).
4695 on 18 June 1966 combined the sub-provinces of Apayao and Kalinga into a full-fledged province named Kalinga-Apayao.
Under the new Constitution which was proclaimed on 11 February 1987, the province constituted a lone congressional district,[2] and elected its member to the restored House of Representatives starting that same year.
Apayao and Kalinga became separate provinces following the passage and subsequent ratification of Republic Act No.