The province is currently represented in the lower house of the Congress of the Philippines through its lone congressional district.
Prior to gaining separate representation, areas now under the jurisdiction of Apayao were represented under the former Mountain Province (1917–1969) and Kalinga-Apayao (1969–1998).
Apayao became a separate province following the passage and subsequent ratification of Republic Act No.
However, in 1935, all senatorial districts were abolished when a unicameral National Assembly was installed under a new constitution following the passage of the Tydings–McDuffie Act, which established the Commonwealth of the Philippines.
Apayao has been represented in the lower house of various Philippine national legislatures since 1995, through its at-large congressional district.