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, PresidentRodrigo Duterte signed Republic Act No. 11080,[1] increasing the legislative districts from four to six and reapportioned the district assignments of cities and municipalities.[2]
^ abIndependent component city since July 4, 1994. Independent from the province and does not vote for provincial officials by virtue of Republic Act No. 7720.[3] Only votes with Isabela for congressional representation.
