San Ildefonso, Province of Ilocos Sur
| Type | municipality |
|---|---|
| Island group | Luzon |
| Region | Ilocos Region (Region I) |
| Province | Ilocos Sur |
| Barangay count | 15 |
| Postal code | 2728 |
| Coastal/Landlocked | landlocked |
| Marine waterbodies | none (landlocked) |
| Philippine major island(s) | Luzon |
| Area (2013) | 11.35 km2 (4.38 sq mi) |
| Population (2020) | 8,190 |
| Density (2020) | 722 / km2 (1,870 / sq mi) |
| Coordinates | 17° 37' North, 120° 24' East (17.6249, 120.3931) |
| Estimated elevation above sea level | 14.3 meters (46.8 feet) |
San Ildefonso is a landlocked municipality in the coastal province of Ilocos Sur.
The municipality has a land area of 11.35 square kilometers or 4.38 square miles which constitutes 0.44% of Ilocos Sur's total area. Its population as determined by the 2020 Census was 8,190. This represented 1.16% of the total population of Ilocos Sur province, or 0.15% of the overall population of the Ilocos Region. Based on these figures, the population density is computed at 722 inhabitants per square kilometer or 1,870 inhabitants per square mile.
Barangays
San Ildefonso has 15 barangays as shown in the following table.
Demographic profile of barangays
| Barangay | Population percentage (2020) | Population (2020) | Population (2015) | Change (2015‑2020) | Annual Population Growth Rate (2015‑2020) |
|---|---|---|---|---|---|
| Arnap | 2.98% | 244 | 218 | 11.93% | 2.40% |
| Bahet | 12.09% | 990 | 836 | 18.42% | 3.62% |
| Belen | 1.47% | 120 | 140 | -14.29% | -3.19% |
| Bungro | 8.40% | 688 | 702 | -1.99% | -0.42% |
| Busiing Norte | 11.40% | 934 | 824 | 13.35% | 2.67% |
| Busiing Sur | 8.11% | 664 | 584 | 13.70% | 2.74% |
| Dongalo | 4.63% | 379 | 347 | 9.22% | 1.87% |
| Gongogong | 4.27% | 350 | 336 | 4.17% | 0.86% |
| Iboy | 5.70% | 467 | 446 | 4.71% | 0.97% |
| Kinamantirisan | 3.61% | 296 | 276 | 7.25% | 1.48% |
| Otol-Patac | 7.29% | 597 | 486 | 22.84% | 4.42% |
| Poblacion East | 8.82% | 722 | 1,001 | -27.87% | -6.65% |
| Poblacion West | 7.52% | 616 | 559 | 10.20% | 2.06% |
| Sagneb | 4.36% | 357 | 336 | 6.25% | 1.28% |
| Sagsagat | 9.35% | 766 | 696 | 10.06% | 2.04% |
| San Ildefonso Total | 8,190 | 7,787 | 5.18% | 1.07% | |
Economy
The annual regular revenue of San Ildefonso for the fiscal year of 2016 was ₱73,904,829.68.
details
| Fiscal Year | Annual Regular Income | Change |
|---|---|---|
| 2009 | 25,549,865.86 | – |
| 2010 | 50,763,086.45 | 98.68% |
| 2011 | 45,097,038.34 | -11.16% |
| 2012 | 35,567,149.49 | -21.13% |
| 2013 | 41,101,866.87 | 15.56% |
| 2014 | 31,219,136.76 | -24.04% |
| 2015 | 59,023,109.89 | 89.06% |
| 2016 | 73,904,829.68 | 25.21% |
End notes:
| ||
Demographics
Households
The household population of San Ildefonso in the 2015 Census was 7,506 broken down into 1,760 households or an average of 4.26 members per household.
details
| Census date | Household population | Number of households | Average household size |
|---|---|---|---|
| 4,528 | 850 | 5.33 | |
| 5,232 | 993 | 5.27 | |
| 5,584 | 1,127 | 4.95 | |
| 6,632 | 1,444 | 4.59 | |
| 7,074 | 1,560 | 4.53 | |
| 7,506 | 1,760 | 4.26 |
Population by age group
According to the 2015 Census, the age group with the highest population in San Ildefonso is 10 to 14, with 869 individuals. Conversely, the age group with the lowest population is 80 and over, with 89 individuals.
details
| Age group | Population (2015) | Age group percentage |
|---|---|---|
| Under 1 | 104 | 1.34% |
| 1 to 4 | 536 | 6.88% |
| 5 to 9 | 689 | 8.85% |
| 10 to 14 | 869 | 11.16% |
| 15 to 19 | 691 | 8.87% |
| 20 to 24 | 712 | 9.14% |
| 25 to 29 | 646 | 8.30% |
| 30 to 34 | 579 | 7.44% |
| 35 to 39 | 574 | 7.37% |
| 40 to 44 | 470 | 6.04% |
| 45 to 49 | 446 | 5.73% |
| 50 to 54 | 368 | 4.73% |
| 55 to 59 | 307 | 3.94% |
| 60 to 64 | 275 | 3.53% |
| 65 to 69 | 196 | 2.52% |
| 70 to 74 | 127 | 1.63% |
| 75 to 79 | 109 | 1.40% |
| 80 and over | 89 | 1.14% |
| Total | 7,787 | 100.00% |
| ||
Historical population
The population of San Ildefonso grew from 2,137 in 1903 to 8,190 in 2020, an increase of 6,053 people over the course of 117 years. The latest census figures in 2020 denote a positive growth rate of 1.07%, or an increase of 403 people, from the previous population of 7,787 in 2015.
details
| Census date | Population | Growth rate |
|---|---|---|
| 2,137 | – | |
| – | -100.00% | |
| – | – | |
| 2,034 | -0.93% | |
| 2,601 | 2.19% | |
| 3,400 | 2.66% | |
| 3,249 | -0.91% | |
| 3,640 | 2.30% | |
| 4,528 | 2.21% | |
| 5,232 | 2.74% | |
| 5,584 | 1.41% | |
| 6,670 | 2.48% | |
| 7,075 | 2.17% | |
| 7,787 | 1.84% | |
| 8,190 | 1.07% |
The total number of registered voters or electorate in San Ildefonso for the year 2019 was 5,541, broken down into 2,736 males and 2,805 females.
Location
The municipal center of San Ildefonso is situated at approximately 17° 37' North, 120° 24' East, in the island of Luzon. Elevation at these coordinates is estimated at 14.3 meters or 46.8 feet above mean sea level.
Distances
Based on the great-circle distance (the shortest distance between two points over the surface of the Earth), the cities closest to San Ildefonso are Vigan, Ilocos Sur, Candon, Ilocos Sur, Batac, Ilocos Norte, Laoag, Ilocos Norte, San Fernando, La Union, and Tabuk, Kalinga. The nearest municipalities are Santo Domingo, Ilocos Sur, San Vicente, Ilocos Sur, Bantay, Ilocos Sur, Santa Catalina, Ilocos Sur, Magsingal, Ilocos Sur, and Caoayan, Ilocos Sur. Its distance from the national capital is 341.59 kilometers (212.26 miles). The following list delineates such distance measurements.
great-circle distance
Nearest towns
- Santo Domingo, Ilocos Sur, 2.27 kilometers (1.41 miles) to the Northeast (N50°E)
- San Vicente, Ilocos Sur, 4.03 kilometers (2.50 miles) to the South‑Southwest (S32°W)
- Bantay, Ilocos Sur, 4.82 kilometers (3.00 miles) to the South (S8°W)
- Santa Catalina, Ilocos Sur, 5.09 kilometers (3.16 miles) to the Southwest (S38°W)
- Magsingal, Ilocos Sur, 7.51 kilometers (4.66 miles) to the North‑Northeast (N27°E)
- Caoayan, Ilocos Sur, 8.61 kilometers (5.35 miles) to the South (S7°W)
Nearest cities
- Vigan, Ilocos Sur, 5.80 kilometers (3.60 miles) to the South (S7°W)
- Candon, Ilocos Sur, 48.53 kilometers (30.16 miles) to the South (S7°E)
- Batac, Ilocos Norte, 51.10 kilometers (31.75 miles) to the North‑Northeast (N21°E)
- Laoag, Ilocos Norte, 66.82 kilometers (41.52 miles) to the North‑Northeast (N18°E)
- San Fernando, La Union, 111.88 kilometers (69.52 miles) to the South (S4°W)
- Tabuk, Kalinga, 115.22 kilometers (71.60 miles) to the East (S82°E)
Distance from Manila: 341.59 kilometers (212.26 miles) to the South (S11°E)
Notes
- Unless otherwise specified, population count (excluding percentages), household data, and land area figures are derived from the Philippine Statistics Authority.
- Data on registered voters is from the Commission on Elections.
- Data on annual regular income is from the Bureau of Local Government Finance, Department of Finance
- Postal code information is from the Philippine Postal Corporation.