REGION I (ILOCOS REGION) - Code: 010000000
| No. of Provinces | 4 | No. of Cities | 9 | No. of Municipalities | 116 | No. of Barangays | 3,267 |
| Population (2015 Census) | 5,026,128 | ||||||
REGION I (ILOCOS REGION) - Provinces
There are 4 provinces as of 31 December 2020.
| Province | Code | Info | Income Class | Population (2015 Census) |
|---|---|---|---|---|
| ILOCOS NORTE | 012800000 | 21 Mun., 2 Cities and 559 Bgys | 1st | 593,081 |
| ILOCOS SUR | 012900000 | 32 Mun., 2 Cities and 768 Bgys | 1st | 689,668 |
| LA UNION | 013300000 | 19 Mun., 1 City and 576 Bgys | 1st | 786,653 |
| PANGASINAN | 015500000 | 44 Mun., 4 Cities and 1364 Bgys | 1st | 2,956,726 |
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