Calasag, Municipality of San Ildefonso, Province of Bulacan
| Type | barangay |
|---|---|
| Island group | Luzon |
| Region | Central Luzon (Region III) |
| Province | Bulacan |
| Municipality | San Ildefonso |
| Postal code | 3010 |
| Population (2020) | 3,705 |
| Philippine major island(s) | Luzon |
| Coordinates | 15.0724, 120.9283 (15° 4' North, 120° 56' East) |
| Estimated elevation above sea level | 16.2 meters (53.1 feet) |
Calasag is a barangay in the municipality of San Ildefonso, in the province of Bulacan. Its population as determined by the 2020 Census was 3,705. This represented 3.20% of the total population of San Ildefonso.
Demographics
Households
The household population of Calasag in the 2015 Census was 3,578 broken down into 884 households or an average of 4.05 members per household.
Trends in household population and size
| Census date | Household population | Number of households | Average household size |
|---|---|---|---|
| 1,735 | 321 | 5.40 | |
| 2,307 | 421 | 5.48 | |
| 2,764 | 508 | 5.44 | |
| 3,118 | 593 | 5.26 | |
| 3,237 | 679 | 4.77 | |
| 3,578 | 884 | 4.05 |
Population by age group
According to the 2015 Census, the age group with the highest population in Calasag is 15 to 19, with 407 individuals. Conversely, the age group with the lowest population is 75 to 79, with 20 individuals.
Age distribution
| Age group | Population (2015) | Age group percentage |
|---|---|---|
| Under 1 | 56 | 1.57% |
| 1 to 4 | 260 | 7.27% |
| 5 to 9 | 332 | 9.28% |
| 10 to 14 | 365 | 10.20% |
| 15 to 19 | 407 | 11.38% |
| 20 to 24 | 374 | 10.45% |
| 25 to 29 | 305 | 8.52% |
| 30 to 34 | 237 | 6.62% |
| 35 to 39 | 260 | 7.27% |
| 40 to 44 | 211 | 5.90% |
| 45 to 49 | 217 | 6.06% |
| 50 to 54 | 168 | 4.70% |
| 55 to 59 | 134 | 3.75% |
| 60 to 64 | 99 | 2.77% |
| 65 to 69 | 64 | 1.79% |
| 70 to 74 | 36 | 1.01% |
| 75 to 79 | 20 | 0.56% |
| 80 and over | 33 | 0.92% |
| Total | 3,578 | 100.00% |
| ||
Historical population
The population of Calasag grew from 1,735 in 1990 to 3,705 in 2020, an increase of 1,970 people over the course of 30 years. The latest census figures in 2020 denote a positive annualized growth rate of 0.74%, or an increase of 127 people, from the previous population of 3,578 in 2015.
Trends in population growth
| Census date | Population | Annualized Growth Rate |
|---|---|---|
| 1,735 | – | |
| 2,307 | 5.48% | |
| 2,764 | 3.95% | |
| 3,128 | 1.72% | |
| 3,237 | 1.25% | |
| 3,578 | 1.93% | |
| 3,705 | 0.74% |
Location
Calasag is situated at approximately 15.0724, 120.9283, in the island of Luzon. Elevation at these coordinates is estimated at 16.2 meters or 53.1 feet above mean sea level.
Adjacent barangays
Calasag shares a common border with the following barangay(s):
Notes
- Data on population, and households, are from the Philippine Statistics Authority.
- Postal code information is from the Philippine Postal Corporation.