 The first and second districts of Ilocos Norte are among the original representative districts from 1907 which has never changed in territorial coverage, along with the first districts of Albay, of Ilocos Sur and of Iloilo.The province has been divided into two districts since 1907.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 first senatorial district which elected two out of the 24-member senate.