 Zamboanga del Sur's former third district automatically became the representation of Zamboanga Sibugay upon its establishment in February 2001, but the new province only elected a representative under its own name beginning in the May 2001 elections.The enactment of Republic Act No.9360 on October 26, 2006 increased Zamboanga Sibugay's representation by reapportioning the province into two congressional districts, which began to elect their separate representatives in the 2007 elections.