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| | Region I (Ilocos Region) (Site not responding. Last check: 2007-11-04) |
 | | 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. |
 | | February 2, 1818 : Ilocos Norte province created from Ilocos by Royal Decree. |
 | | March 2, 1850 : La Union province created from Ilocos Sur and Pangasinan by Superior Decreto. |
| islandphilippines.com /map/region01.htm (147 words) |
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