Exceptions are territories which were annexed in 1921 from Bukidnon and thus formed part of the representation of the Department of Mindanao and Sulu from 1917 to 1922: Napaliran (annexed to Balingasag in 1921), Claveria (became a municipality in 1950),[1] Lourdez (distributed between Alubijid, El Salvador, Initao, Manticao and Opol in 1955)[2] and Lumbia (distributed between Cagayan de Oro and Opol in 1954).
During the Second World War, the Province of Misamis Oriental 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 the province retained its pre-war lone congressional district.
Even after receiving their own city charters, Cagayan de Oro and Gingoog remained part of the representation of the Province of Misamis Oriental by virtue of Section 90 of Republic Act No.
Under the new Constitution which was proclaimed on February 11, 1987, the province was reapportioned into two congressional districts;[8] each elected its member to the restored House of Representatives starting that same year.