The Legislative district of Kalinga-Apayao were the representations of the historical province of Kalinga-Apayao in the various national legislatures of the Philippines. 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.
History
In 1917 the undivided Mountain Province, of which Apayao and Kalinga were component sub-provinces, was provided representation in the Philippine Legislature. Pursuant to the Revised Administrative Code (Act No. 2711) enacted on 10 March 1917, the non-Christian-majority areas of the Philippines, which then included the Mountain Province, were to be collectively represented in the legislature's upper house by two senators from the 12th senatorial district, both appointed by the Governor-General. Three assembly members, also appointed by the Governor-General, were to represent the Mountain Province and the chartered city of Baguio in the lower house as a single at-large district.
The residents of the undivided Mountain Province only began electing representatives through popular vote in 1935 by virtue of Act No. 4203; the law provided the territorial coverage for each lower house representative district, while also abolishing the senatorial district system. The sub-provinces of Apayao and Kalinga were then represented as part of the Mountain Province's first district.
In the disruption caused by the Second World War, the Mountain Province sent two delegates to the National Assembly of the Japanese-sponsored Second Philippine Republic: one was the provincial governor (an ex officio member), while the other was elected through a provincial assembly of KALIBAPI members during the Japanese occupation of the Philippines. Upon the restoration of the Philippine Commonwealth in 1945, district representation was restored to the pre-war setup: the sub-provinces of Apayao and Kalinga remained part of Mountain Province's first district.
The enactment of Republic Act No. 4695 on 18 June 1966 combined the sub-provinces of Apayao and Kalinga into a full-fledged province named Kalinga-Apayao. The new province began electing its separate representative starting in the next general election.
Kalinga-Apayao was represented as part of Region II from 1978 to 1984, and returned one representative, elected at-large, to the Regular Batasang Pambansa in 1984. It retained its lone congressional district under the new Constitution which was proclaimed on 11 February 1987, 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. 7878 in 1995. The new provinces began electing their own representatives in the 1998 elections.