Casilagan, Municipality of Narvacan, Province of Ilocos Sur

Summary data
Typebarangay
Island groupLuzon
RegionIlocos Region (Region I)
ProvinceIlocos Sur
MunicipalityNarvacan
Postal code2704
Population (2020)771
Philippine major island(s)Luzon
Coordinates17.4623, 120.5535 (17° 28' North, 120° 33' East)
Estimated elevation above sea level33.2 meters (108.9 feet)

Casilagan is a barangay in the municipality of Narvacan, in the province of Ilocos Sur. Its population as determined by the 2020 Census was 771. This represented 1.67% of the total population of Narvacan.

Demographics

Households

The household population of Casilagan in the 2015 Census was 647 broken down into 148 households or an average of 4.37 members per household.

details
Number of households in Casilagan (1990‑2015)
Census dateHousehold populationNumber of householdsAverage household size
5761184.88
5911274.65
6021274.74
6731384.88
6271404.48
6471484.37

Population by age group

According to the 2015 Census, the age group with the highest population in Casilagan is 10 to 14, with 75 individuals. Conversely, the age group with the lowest population is 65 to 69, with 5 individuals.

details
Population of Casilagan by age group (2015 census)
Age groupPopulation (2015)Age group percentage
Under 1121.85%
1 to 4436.65%
5 to 9487.42%
10 to 147511.59%
15 to 19487.42%
20 to 246610.20%
25 to 29629.58%
30 to 34507.73%
35 to 39456.96%
40 to 44233.55%
45 to 49264.02%
50 to 54446.80%
55 to 59467.11%
60 to 64233.55%
65 to 6950.77%
70 to 74101.55%
75 to 79121.85%
80 and over91.39%
Total647100.00%
  • Youth Dependency Ratio: 41.11
  • Old Age Dependency Ratio: 8.31
  • Total Dependency Ratio: 49.42
  • Median Age: 27.54

Historical population

The population of Casilagan grew from 576 in 1990 to 771 in 2020, an increase of 195 people over the course of 30 years. The latest census figures in 2020 denote a positive growth rate of 3.76%, or an increase of 124 people, from the previous population of 647 in 2015.

Population of Casilagan (1990‑2020)
Census datePopulationGrowth rate
576
5910.48%
6020.40%
6731.55%
627-2.54%
6470.60%
7713.76%

Location

Casilagan is situated at approximately 17.4623, 120.5535, in the island of Luzon. Elevation at these coordinates is estimated at 33.2 meters or 108.9 feet above mean sea level.


Adjacent barangays

Casilagan shares a common border with the following barangay(s):

Notes

  1. Data on population, and households, are from the Philippine Statistics Authority.
  2. Postal code information is from the Philippine Postal Corporation.
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