 Batangas was divided into three representative districts from 1907 to 1972, with a minor adjustment of district boundaries as mandated by Act No.3378 (enacted on December 3, 1927) taking effect starting in the 1928 elections.When seats for the upper house of the Philippine Legislature were elected from territory-based districts between 1916 and 1935, the province formed part of the fifth senatorial district which elected two out of the 24-member senate.