Region II (Cagayan Valley)

PSGC: 020000000
ISO: 02
Regional Centre: Tuguegarao City
Congressional Districts: 10
Provinces: 5
Cities: 3
Municipalities: 90
Barangays: 2,311

September 24, 1972: Region II (Cagayan Valley) created from Batanes, Cagayan, Ifugao, Isabela, Kalinga-Apayao, Nueva Vizcaya and Quirino with Tuguegarao City as the regional centre, by Presidential Decree No. 1 as part of the Integrated Reorganisation Plan.

PSGC: 020900000
ISO: BTN
Province Capital: Basco
Area Code: 78
Congressional Districts: 1
Cities: 0
Municipalities: 6
Barangays: 29

June 26, 1783: Annexed as a province of the Philippines.
1799: Became a town of Cagayan.
1855: Batanes restored as a province from Cagayan.
February 6, 1901: Became a municipality of Cagayan by Provincial Government Act No. 83.
May 10, 1909: Restored as a province from Cagayan by Act No. 1952.
March 10, 1917: Province established by Act No. 2711.

PSGC: 021500000
ISO: CAG
Province Capital: Tuguegarao City
Area Code: 78
Congressional Districts: 3
Cities: 1
Municipalities: 28
Barangays: 820

1581: Cagayan province created.
1799: Batanes annexed.
1900: Batanes annexed.
March 10, 1917: Province established by Act No. 2711.

PSGC: 023100000
ISO: ISA
Province Capital: Ilagan
Area Code: 78
Congressional Districts: 4
Cities: 2
Municipalities: 35
Barangays: 1,055

May 1, 1856: Isabela province created mainly from Cagayan and Nueva Vizcaya with some areas from Nueva Ecija by Royal Decree.
March 10, 1917: Province established by Act No. 2711.
February 20, 1995: Isabela del Norte province and Isabela del Sur province created from Isabela by Republic Act No. 7891, but defeated by plebiscite.

¹ Part of Isabela del Sur.
² Isabela del Sur province capital.
³ Presumably geographically part of Isabela del Sur but otherwise independent of it.

PSGC: 025000000
ISO: NUV
Province Capital: Bayombong
Area Code: 78
Congressional Districts: 1
Cities: 0
Municipalities: 15
Barangays: 275

May 24, 1839: Nueva Vizcaya created as a province from Cagayan by Order.
April 10, 1841: Creation of Nueva Vizcaya province approved by Royal Decree.
March 10, 1917: Province established by Act No. 2711.

PSGC: 025700000
ISO: QUI
Province Capital: Cabarroguis
Area Code: 78
Congressional Districts: 1
Cities: 0
Municipalities: 6
Barangays: 132

June 18, 1966: Quirino created as a sub-province of Nueva Vizcaya by Republic Act No. 4734.
September 10, 1971: Became a full province by Republic Act No. 6394.