Ilocos Region (Region I)
 | |
| Type | region |
|---|---|
| Island group | Luzon |
| Provinces | 4 |
| Cities | 9 |
| Municipalities | 116 |
| Barangays | 3,267 |
| Coastal/Landlocked | coastal |
| Marine waterbodies | South China Sea |
| Area (2013) | 129.65 km2 (5005.67 sq mi) |
| Population (2020) | 5,301,139 |
| Density (2020) | 409 / km2 (1,059 / sq mi) |
Ilocos Region, officially designated as Region I, is an administrative region in the Philippines occupying the northwestern section of Luzon. It covers 4 provinces, namely, Ilocos Norte, Ilocos Sur, La Union, and Pangasinan. The regional center is the City of San Fernando.
Its population as determined by the 2020 Census was 5,301,139. This represented 8.52% of the overall population of the Luzon island group, or 4.86% of the entire population of the Philippines. Based on these figures, the population density is computed at 409 inhabitants per square kilometer or 1,059 inhabitants per square mile.
Map
Ilocos Region is bordered, clockwise from the Northeast, by the Cagayan Valley, Cordillera Administrative Region, Central Luzon, and the South China Sea.
details
Local government units
Ilocos Region has 4 provinces, 116 municipalities, and 9 cities. The total number of barangays in the region is 3,267.
details
| Name | Type | Population (2020) | Population (2015) | Annual Population Growth Rate (2015‑2020) | Area (2013), in km2 | Density (2020), per km2 | City count | Mun count | Brgy count |
|---|---|---|---|---|---|---|---|---|---|
| Ilocos Norte | province | 609,588 | 593,081 | 0.58% | 3,418.75 | 178 | 2 | 21 | 559 |
| Ilocos Sur | province | 706,009 | 689,668 | 0.49% | 2,596.00 | 272 | 2 | 32 | 768 |
| La Union | province | 822,352 | 786,653 | 0.94% | 1,499.28 | 548 | 1 | 19 | 576 |
| Pangasinan | province | 3,163,190 | 2,956,726 | 1.43% | 5,450.59 | 580 | 4 | 44 | 1,364 |
| Ilocos Region Total | 5,301,139 | 5,026,128 | 1.13% | 12,964.62 | 409 | 9 | 116 | 3,267 | |
Demographics
Population by age group
According to the 2015 Census, the age group with the highest population in Ilocos Region is 5 to 9, with 510,858 individuals. Conversely, the age group with the lowest population is 75 to 79, with 61,471 individuals.
Age distribution
| Age group | Population (2015) | Age group percentage |
|---|---|---|
| Under 1 | 96,663 | 1.92% |
| 1 to 4 | 405,449 | 8.07% |
| 5 to 9 | 510,858 | 10.16% |
| 10 to 14 | 502,318 | 9.99% |
| 15 to 19 | 474,530 | 9.44% |
| 20 to 24 | 438,415 | 8.72% |
| 25 to 29 | 391,660 | 7.79% |
| 30 to 34 | 365,782 | 7.28% |
| 35 to 39 | 336,500 | 6.70% |
| 40 to 44 | 295,564 | 5.88% |
| 45 to 49 | 276,698 | 5.51% |
| 50 to 54 | 237,159 | 4.72% |
| 55 to 59 | 201,337 | 4.01% |
| 60 to 64 | 159,163 | 3.17% |
| 65 to 69 | 123,030 | 2.45% |
| 70 to 74 | 82,362 | 1.64% |
| 75 to 79 | 61,471 | 1.22% |
| 80 and over | 67,169 | 1.34% |
| Total | 5,026,128 | 100.00% |
| ||
Historical population
The population of Ilocos Region grew from 948,935 in 1903 to 5,301,139 in 2020, an increase of 4,352,204 people over the course of 117 years. The latest census figures in 2020 denote a positive annualized growth rate of 1.13%, or an increase of 275,011 people, from the previous population of 5,026,128 in 2015.
Trends in population growth
| Census date | Population | Annualized Growth Rate |
|---|---|---|
| 948,935 | – | |
| 1,210,909 | 1.55% | |
| 1,459,294 | 0.94% | |
| 1,685,564 | 1.49% | |
| 2,042,865 | 1.70% | |
| 2,488,391 | 1.95% | |
| 2,726,220 | 1.85% | |
| 2,922,892 | 1.40% | |
| 3,550,642 | 1.96% | |
| 3,803,890 | 1.30% | |
| 4,200,478 | 2.15% | |
| 4,546,789 | 1.10% | |
| 4,748,372 | 1.59% | |
| 5,026,128 | 1.09% | |
| 5,301,139 | 1.13% |
The total number of registered voters or electorate in Ilocos Region for the year 2019 was 3,331,404.
Notes
- Unless otherwise specified, population count (excluding percentages) and land area figures are derived from the Philippine Statistics Authority.
- Data on registered voters is from the Commission on Elections.
- Maps utilize OpenStreetMap data available under the Open Data Commons Open Database License.