[1] Sulu had been admitted as a special province under the Department of Mindanao and Sulu since 1914 but was only previously represented through a multi-member delegation appointed by the Governor General covering all of Mindanao territory except Misamis and Surigao beginning in 1916.
[3] The Spanish district of Jolo was earlier represented in the Malolos Congress of the nascent First Philippine Republic by two delegates from Luzon.
44 in 1936 which removed the restrictions on qualified voters in the former Bureau of Non-Christian Tribes-designated jurisdiction.
It reverted to single-member representation for the restored Commonwealth and subsequent Third Republic House of Representatives.
Following a shift to parliamentary system, districts were replaced by multi-member regional constituencies where Sulu, reduced to the Jolo island group following the separation of Tawi-Tawi in 1973, was represented as part of Region IX's at-large district.