Prior to gaining separate representation, areas now under the jurisdiction of Lanao del Sur were represented under the Department of Mindanao and Sulu (1917–1935) and the historical Lanao Province (1935–1961).
The enactment of Republic Act No. 2228 on May 22, 1959 divided the old Lanao Province into Lanao del Norte and Lanao del Sur, and provided them each with a congressional representative.[1] In accordance with Section 8 of R.A. 2228, the incumbent representative of Lanao Province, Laurentino Badelles, also represented Lanao del Sur until voters of the new province elected their separate representative in the next general election, which took place in 1961.[1] The chartered city of Dansalan (renamed to Marawi in 1956[2]), despite being enumerated as part of the territory of neither successor province,[1] was designated as Lanao del Sur's seat of provincial government and became part of its lone congressional district.
Under the new Constitution which was proclaimed on February 11, 1987, the province was reapportioned into two congressional districts;[3] each elected its member to the restored House of Representatives starting that same year.
^Only took oath of office on November 19, 1987, following the completion of voting in all areas where failures of elections were declared. Died on April 30, 1990; seat remained vacant for the remainder of the 8th Congress.[5]
^Only took oath of office on November 10, 1992,[5] following the completion of voting in all areas where failures of elections were declared.
^Only took oath of office on November 15, 2010,[5] following the completion of voting in all areas where failures of elections were declared.
^Only took oath of office for second term on January 18, 1993,[5] following the completion of voting in all areas where failures of elections were declared.
^Only took oath of office on November 11, 1998,[5] following the completion of voting in all areas where failures of elections were declared.
^Only took oath of office on June 24, 1970[5] following the resolution of legal battle surrounding the 1969 election results contested by Rashid Lucman.[6]