Ilocos Region (Region I)

Summary data
Map of the Philippines highlighting Ilocos Region
Typeregion
Island groupLuzon
Provinces4
Cities9
Municipalities116
Barangays3,267
Coastal/Landlockedcoastal
Marine waterbodiesSouth 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
Map of Ilocos RegionMap of Ilocos Region highlighting its regional center, component provinces and their capitals, and nearby major citiesIlocos NorteIlocos SurLa UnionPangasinanSan Fernando, the regional center

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
Local government units of Ilocos Region
NameTypePopulation (2020)Population (2015)Annual Population Growth Rate (2015‑2020)Area (2013), in km2Density (2020), per km2City countMun countBrgy count
Ilocos Norteprovince609,588593,0810.58%3,418.75178221559
Ilocos Surprovince706,009689,6680.49%2,596.00272232768
La Unionprovince822,352786,6530.94%1,499.28548119576
Pangasinanprovince3,163,1902,956,7261.43%5,450.595804441,364
Ilocos Region Total5,301,1395,026,1281.13%12,964.6240991163,267

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.

details
Population of Ilocos Region by age group (2015 census)
Age groupPopulation (2015)Age group percentage
Under 196,6631.92%
1 to 4405,4498.07%
5 to 9510,85810.16%
10 to 14502,3189.99%
15 to 19474,5309.44%
20 to 24438,4158.72%
25 to 29391,6607.79%
30 to 34365,7827.28%
35 to 39336,5006.70%
40 to 44295,5645.88%
45 to 49276,6985.51%
50 to 54237,1594.72%
55 to 59201,3374.01%
60 to 64159,1633.17%
65 to 69123,0302.45%
70 to 7482,3621.64%
75 to 7961,4711.22%
80 and over67,1691.34%
Total5,026,128100.00%
  • Youth Dependency Ratio: 47.7
  • Old Age Dependency Ratio: 10.51
  • Total Dependency Ratio: 58.21
  • Median Age: 26.08

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 growth rate of 1.13%, or an increase of 275,011 people, from the previous population of 5,026,128 in 2015.

details
Population of Ilocos Region (1903‑2020)
Census datePopulationGrowth rate
948,935
1,210,9091.55%
1,459,2940.94%
1,685,5641.49%
2,042,8651.70%
2,488,3911.95%
2,726,2201.85%
2,922,8921.40%
3,550,6421.96%
3,803,8901.30%
4,200,4782.15%
4,546,7891.10%
4,748,3721.59%
5,026,1281.09%
5,301,1391.13%

The total number of registered voters or electorate in Ilocos Region for the year 2019 was 3,331,404.

Notes

  1. Unless otherwise specified, population count (excluding percentages) and land area figures are derived from the Philippine Statistics Authority.
  2. Data on registered voters is from the Commission on Elections.
  3. Maps utilize OpenStreetMap data available under the Open Data Commons Open Database License.
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