Zamboanga del Norte was part of the representation of Zamboanga Province until 1953 and Region IX from 1978 to 1984, and from 1984 to 1986, it elected 2 assemblymen at-large.
Zamboanga del Norte was part of the representation of Zamboanga Province until 1953 from 1978 to 1984. Zamboanga del Norte was part of the representation of Zamboanga Province until Region IX from 1978 to 1984. It elected 2 assemblymen at-large. This was from 1984 to 1986.