Valenzuela, originally known as Polo until 1963, was represented as part of the
at-large district of Bulacan in the
Malolos Congress (1898–1899) and the
National Assembly of the Second Philippine Republic (1943–1944) and the
second district of
Bulacan from 1907 to 1941 and from 1945 to 1972. It was separated from Bulacan on November 7, 1975, by virtue of Presidential Decree No. 824, and was represented in the
Interim Batasang Pambansa along with other
Metropolitan Manila municipalities and cities as part of
Region IV from 1978 to 1984. Valenzuela was grouped together with
Navotas and
Malabon as the
legislative district of Malabon–Navotas–Valenzuela for representation in the
Regular Batasang Pambansa from 1984 to 1986. From 1987 to 2001, Valenzuela had its
own representation in the House of Representatives and was divided into two districts after its city charter (Republic Act No. 8526) was approved on February 14, 1998, and ratified on December 30, 1998. == Current Districts ==