Lang‑ayan, Municipality of Santiago, Province of Ilocos Sur

Summary data
Typebarangay
Island groupLuzon
RegionIlocos Region (Region I)
ProvinceIlocos Sur
MunicipalitySantiago
Postal code2707
Population (2020)402
Philippine major island(s)Luzon
Coordinates17.2774, 120.4381 (17° 17' North, 120° 26' East)
Estimated elevation above sea level22.0 meters (72.2 feet)

Lang‑ayan is a barangay in the municipality of Santiago, in the province of Ilocos Sur. Its population as determined by the 2020 Census was 402. This represented 2.06% of the total population of Santiago.

Demographics

Households

The household population of Lang-ayan in the 2015 Census was 373 broken down into 100 households or an average of 3.73 members per household.

details
Number of households in Lang-ayan (1990‑2015)
Census dateHousehold populationNumber of householdsAverage household size
360734.93
356744.81
359744.85
321804.01
344834.14
3731003.73

Population by age group

According to the 2015 Census, the age groups with the highest population in Lang-ayan are in the ranges 5 to 9, and 35 to 39, with 33 individuals. Conversely, the age group with the lowest population is 80 and over, with 4 individuals.

details
Population of Lang-ayan by age group (2015 census)
Age groupPopulation (2015)Age group percentage
Under 151.34%
1 to 4297.77%
5 to 9338.85%
10 to 14266.97%
15 to 19205.36%
20 to 24308.04%
25 to 29277.24%
30 to 34318.31%
35 to 39338.85%
40 to 44328.58%
45 to 49195.09%
50 to 54215.63%
55 to 59112.95%
60 to 64164.29%
65 to 69154.02%
70 to 74102.68%
75 to 79112.95%
80 and over41.07%
Total373100.00%
  • Youth Dependency Ratio: 38.75
  • Old Age Dependency Ratio: 16.67
  • Total Dependency Ratio: 55.42
  • Median Age: 32.66

Historical population

The population of Lang-ayan grew from 360 in 1990 to 402 in 2020, an increase of 42 people over the course of 30 years. The latest census figures in 2020 denote a positive growth rate of 1.59%, or an increase of 29 people, from the previous population of 373 in 2015.

Population of Lang-ayan (1990‑2020)
Census datePopulationGrowth rate
360
356-0.21%
3590.18%
321-1.53%
3442.55%
3731.55%
4021.59%

Location

Lang‑ayan is situated at approximately 17.2774, 120.4381, in the island of Luzon. Elevation at these coordinates is estimated at 22.0 meters or 72.2 feet above mean sea level.


Adjacent barangays

Lang‑ayan 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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