Region I (Ilocos Region)

PSGC: 010000000
ISO: 01
Regional Centre: San Fernando, City of
Congressional Districts: 12
Provinces: 4
Cities: 9
Municipalities: 116
Barangays: 3,265

September 24, 1972: Region I (Ilocos Region) created from Abra, Benguet, Ilocos Norte, Ilocos Sur, La Union, the Mountain Province and Pangasinan with San Fernando, City of, as the regional centre, by Presidential Decree No. 1 as part of the Integrated Reorganisation Plan.

PSGC: 012800000
ISO: ILN
Province Capital: Laoag City
Area Code: 77
Congressional Districts: 2
Cities: 2
Municipalities: 21
Barangays: 557

February 2, 1818: Ilocos Norte province created from Ilocos by Royal Decree.
March 10, 1917: Province established by Act No. 2711.

PSGC: 012900000
ISO: ILS
Province Capital: Vigan, City of
Area Code: 77
Congressional Districts: 2
Cities: 2
Municipalities: 32
Barangays: 768

1572/1574: Ilocos province created.
February 2, 1818: Ilocos Sur province created from Ilocos by Royal Decree.
March 10, 1917: Province established by Act No. 2711.

PSGC: 013300000
ISO: LUN
Province Capital: San Fernando, City of
Area Code: 72
Congressional Districts: 2
Cities: 1
Municipalities: 19
Barangays: 576

March 2, 1850: La Union province created from Ilocos Sur and Pangasinan by Superior Decreto.
April 18, 1854: Creation of La Union province approved by Royal Decree.
March 10, 1917: Province established by Act No. 2711.

PSGC: 015500000
ISO: PAN
Province Capital: Lingayen
Area Code: 75
Congressional Districts: 6
Cities: 4
Municipalities: 44
Barangays: 1,364

1580: Pangasinan created as a district.
1611: Became a province.
1901: Towns from Zambales ceded to Pangasinan.
March 10, 1917: Province established by Act No. 2711.