Region I (Ilocos Region)
| 10 Digit Code: | 0100000000 |
| Correspondence Code: | 010000000 |
| No. of Provinces | 4 | No. of Cities | 9 | No. of Municipalities | 116 | No. of Barangays | 3,267 |
| Population (2020 Census) | 5,301,139 | ||||||
Region I (Ilocos Region) - Provinces
There are 4 provinces as of 31 December 2022.
| Province | 10 Digit Code | Correspondence Code | Info | Income Class | Population (2020 Census) |
|---|---|---|---|---|---|
| Ilocos Norte | 0102800000 | 012800000 | 21 Mun., 2 Cities and 559 Bgys | 1st | 609,588 |
| Ilocos Sur | 0102900000 | 012900000 | 32 Mun., 2 Cities and 768 Bgys | 1st | 706,009 |
| La Union | 0103300000 | 013300000 | 19 Mun., 1 City and 576 Bgys | 1st | 822,352 |
| Pangasinan | 0105500000 | 015500000 | 44 Mun., 4 Cities and 1364 Bgys | 1st | 3,163,190 |
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