The legislative districts of Isabela are the representations of the province of Isabela and the independent component city of Santiago in the various national legislatures of the Philippines. The province and the city are currently represented in the lower house of the Congress of the Philippines through their first, second, third, fourth, fifth, and sixth congressional districts.
The province was represented as a lone legislative district until 1972. It was part of the representation of Region II from 1978 to 1984, and from 1984 to 1986, it elected 3 assemblymen at-large. In 1986, it was redistricted into four legislative districts.
On September 27, 2018, President Rodrigo Duterte signed Republic Act No. 11080, increasing the legislative districts from four to six and reapportioned the district assignments of cities and municipalities.
The province was last redistricted on September 27, 2018, where the fifth and sixth districts were apportioned. The province's current congressional delegation is composed of three members of LakasâÂÂCMD and three members of the Partido Federal ng Pilipinas. All six representatives are part of the majority bloc in the 20th Congress.
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