Region XII (SOCCSKSARGEN)

PSGC: 120000000
ISO: 12
Regional Centre: Koronadal, City of
Congressional Districts: 7
Provinces: 4
Cities: 5 *
Municipalities: 45
Barangays: 1,194 *

July 7, 1975: Region XII (Central Mindanao) created from Lanao del Norte, Lanao del Sur, Maguindanao, North Cotabato and Sultan Kudarat with Cotabato City as the regional centre by Presidential Decree No. 742.
July 25, 1979: Region XII established as an autonomous region by Presidential Decree No. 1618 in accordance to the Tripoli Agreement of December 23, 1976.
August 1, 1989: Lanao del Sur excluding Marawi City and Maguindanao excluding Cotabato City removed from Region XII by Republic Act No. 6734. Ceased to be an autonomous region.
October 12, 1990: Lanao del Norte and Marawi City removed from Region XII, South Cotabato transferred into Region XII, and Koronadal, City of, designated as regional centre by Executive Order No. 429, but not executed.
February 23, 1995: Sultan Kudarat removed from Region XII by Republic Act No. 7901.
December 10, 1998: Sultan Kudarat transferred into Region XII by Republic Act No. 8744.
September 19, 2001: Lanao del Norte and Marawi City removed from Region XII, Sarangani and South Cotabato transferred into Region XII, and Region XII renamed Region XII (SOCCSKSARGEN) by Executive Order No. 36.
March 30, 2004: Koronadal, City of, designated as regional centre by Executive Order No. 304.

* Including Cotabato City.

PSGC: 124700000
ISO: NCO
Province Capital: Kidapawan, City of
Area Code: 64
Congressional Districts: 2
Cities: 1
Municipalities: 17
Barangays: 543

1860: Cotabato created as a district.
July 23, 1914: Cotabato province created from the Department of Mindanao and Sulu.
March 10, 1917: Province established by Act No. 2711.
November 22, 1973: North Cotabato province created from Cotabato by Presidential Decree No. 341.
December 19, 1983: North Cotabato renamed Cotabato by Batas Pambansa No. 660.

PSGC: 128000000
ISO: SAR
Province Capital: Alabel
Area Code: 83
Congressional Districts: 1
Cities: 0
Municipalities: 7
Barangays: 140

March 16, 1992: Sarangani province created from South Cotabato by Republic Act No. 7228.

PSGC: 126300000
ISO: SCO
Province Capital: Koronadal, City of
Area Code: 83
Congressional Districts: 2
Cities: 2
Municipalities: 10
Barangays: 225

July 18, 1966: South Cotabato province created from Cotabato by Republic Act No. 4849.

PSGC: 126500000
ISO: SUK
Province Capital: Isulan
Area Code: 64
Congressional Districts: 2
Cities: 1
Municipalities: 11
Barangays: 249

November 22, 1973: Sultan Kudarat province created from Cotabato by Presidential Decree No. 341.