Zamboanga del Norte is the largest province of the Zamboanga Peninsula region by land area covering 7,301.00 square kilometres (2,818.93 sq mi). Zamboanga del Norte is the 26th populous province in the Philippines.
Prior to its creation as a province, Zamboanga del Norte formed the northern portion of the historical province of Zamboanga.
The early history of Zamboanga del Norte is shared with that of Zamboanga City, which had been the center of the entire Mindanao area, most notably during the American era. When Zamboanga City became a chartered city on October 12, 1936, it encompassed the southern tip of the Zamboanga Peninsula and the island of Basilan, making it the largest city in the world in terms of land area.
Through Republic Act No. 711 issued on June 6, 1952, Zamboanga province was divided into two independent provinces, which included Zamboanga del Sur.