Bia‑o, Municipality of Santa Maria, Province of Ilocos Sur
| Type | barangay |
|---|---|
| Island group | Luzon |
| Region | Ilocos Region (Region I) |
| Province | Ilocos Sur |
| Municipality | Santa Maria |
| Postal code | 2705 |
| Population (2020) | 532 |
| Philippine major island(s) | Luzon |
| Coordinates | 17.3844, 120.4546 (17° 23' North, 120° 27' East) |
| Estimated elevation above sea level | 3.7 meters (12.1 feet) |
Bia‑o is a barangay in the municipality of Santa Maria, in the province of Ilocos Sur. Its population as determined by the 2020 Census was 532. This represented 1.77% of the total population of Santa Maria.
Demographics
Households
The household population of Bia-o in the 2015 Census was 577 broken down into 143 households or an average of 4.03 members per household.
Trends in household population and size
| Census date | Household population | Number of households | Average household size |
|---|---|---|---|
| 377 | 84 | 4.49 | |
| 403 | 83 | 4.86 | |
| 475 | 100 | 4.75 | |
| 548 | 119 | 4.61 | |
| 548 | 133 | 4.12 | |
| 577 | 143 | 4.03 |
Population by age group
According to the 2015 Census, the age group with the highest population in Bia-o is 10 to 14, with 63 individuals. Conversely, the age group with the lowest population is 75 to 79, with 5 individuals.
Age distribution
| Age group | Population (2015) | Age group percentage |
|---|---|---|
| Under 1 | 12 | 2.08% |
| 1 to 4 | 45 | 7.80% |
| 5 to 9 | 61 | 10.57% |
| 10 to 14 | 63 | 10.92% |
| 15 to 19 | 39 | 6.76% |
| 20 to 24 | 36 | 6.24% |
| 25 to 29 | 34 | 5.89% |
| 30 to 34 | 49 | 8.49% |
| 35 to 39 | 50 | 8.67% |
| 40 to 44 | 40 | 6.93% |
| 45 to 49 | 30 | 5.20% |
| 50 to 54 | 22 | 3.81% |
| 55 to 59 | 28 | 4.85% |
| 60 to 64 | 16 | 2.77% |
| 65 to 69 | 18 | 3.12% |
| 70 to 74 | 15 | 2.60% |
| 75 to 79 | 5 | 0.87% |
| 80 and over | 14 | 2.43% |
| Total | 577 | 100.00% |
| ||
Historical population
The population of Bia-o grew from 377 in 1990 to 532 in 2020, an increase of 155 people over the course of 30 years. The latest census figures in 2020 denote a negative annualized growth rate of 1.69%, or a decrease of 45 people, from the previous population of 577 in 2015.
Trends in population growth
| Census date | Population | Annualized Growth Rate |
|---|---|---|
| 377 | – | |
| 403 | 1.26% | |
| 475 | 3.59% | |
| 548 | 1.99% | |
| 548 | 0.00% | |
| 577 | 0.99% | |
| 532 | -1.69% |
Location
Bia‑o is situated at approximately 17.3844, 120.4546, in the island of Luzon. Elevation at these coordinates is estimated at 3.7 meters or 12.1 feet above mean sea level.
Adjacent barangays
Bia‑o 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.