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Municipality

San Ildefonso

San Ildefonso is a municipality in Ilocos Sur, Ilocos Region, Philippines. Its population was 8,213 in the 2024 census, and it has 15 barangays.

  • Population: 2024 Census
  • Places: PSGC 2Q 2026
  • Checked by Scene: October 8, 2026
  • Page updated: October 9, 2026
Colour byColours the map of San Ildefonso by the figure chosen; the key beside it says what each colour means.
BantaySan VicenteSanto DomingoArnap: 234 people, 334 per km², −1.00% a yearBahet: 943 people, 960 per km², −1.16% a yearBelen: 114 people, 393 per km², −1.22% a yearBungro: 733 people, 255 per km², 1.53% a yearBusiing Sur: 712 people, 1,518 per km², 1.69% a yearBusiing Norte: 971 people, 1,235 per km², 0.94% a yearDongalo: 414 people, 908 per km², 2.14% a yearGongogong: 319 people, 280 per km², −2.20% a yearIboy: 509 people, 1,376 per km², 2.09% a yearOtol-Patac: 627 people, 536 per km², 1.18% a yearPoblacion East: 710 people, 797 per km², −0.40% a yearPoblacion West: 602 people, 4,561 per km², −0.55% a yearKinamantirisan: 268 people, 518 per km², −2.35% a yearSagneb: 319 people, 964 per km², −2.66% a yearSagsagat: 738 people, 1,051 per km², −0.89% a year

People · 2024 Census

  • Under 690
  • 690 to 1,100
  • 1,100 to 1,800
  • 1,800 to 3,100
  • 3,100 and over

The same steps colour every map of barangays in the Atlas, so a colour means the same range everywhere.

Density · people per km², 2024

  • Under 160
  • 160 to 340
  • 340 to 700
  • 700 to 2,600
  • 2,600 and over

The same steps colour every map of barangays in the Atlas, so a colour means the same range everywhere.

Growth a year · 2020–2024

  • Fell by more than 1% a year
  • Fell, by up to 1% a year
  • Grew, by under 1% a year
  • Grew by 1 to 2% a year
  • Grew by 2% a year or more

Each place's yearly change between the 2020 and 2024 censuses, on the same steps as every map in the Atlas.

Borders from UN OCHA (PSA and NAMRIA), a guide and not the legal boundary[3]Open in OpenStreetMap

  • PeopleSources

    8,213

    people counted in the 2024 censusCensusA count of every person in the country, all on one day. The 2024 census counted people as they were on 1 July 2024.More in the glossary

    Up 16.1% from 2010 to 2024

  • Rank by peopleSources

    26th

    of the 34 cities and municipalities of Ilocos Sur by population, 2024Rank and shareWorked out by Scene from the PSA's counts: where a place stands among the places listed with it, and how many of every 100 of its parent's people live in it.More in the glossary

    About 1 of every 100 people in Ilocos Sur lived in San Ildefonso in 2024 (1.16%)

  • Inside itSources

    15

    barangays

  • LandSources

    10.56 km²

    of land, 2019 masterlistLand areaThe land inside the place's official boundary. A square kilometre is a square 1 km on each side, about the size of 140 football fields.Explained by Scene: San Ildefonso's land would fill a square about 3.2 km on each side. That is only a way to picture its size: its real shape is on the map.More in the glossary

    Average density, 2024: 778 people per km²Population densityHow crowded a place is on average: its people divided by its land area. 1,000 people per square kilometre is 10 people per hectare, a square of 100 by 100 metres.Explained by Scene: About 8 people per hectare if everyone were spread evenly across the land. In fact people live closer together in towns and farther apart in the countryside.More in the glossary

  • HomesSources

    2,137

    households in 2024HouseholdA person living alone, or people who sleep in the same home and share their meals. A family may be one household or several.More in the glossary

    3.8 people in each, on average, in 2024

  • Town or countrySources

    11.5%

    About 12 of every 100 people lived in urban barangays in 2024Urban barangayThe PSA counts a barangay as urban when it has 5,000 people or more, or a big employer, or several businesses and public services close by. Every barangay in Metro Manila is urban.More in the glossary

PSGC codePSGC codeThe code the Philippine Statistics Authority gives every place, so each one is known exactly, even when two share a name.More in the glossary
0102919000[4]Formerly 012919000
ZIP code
2728[12, 13]

People

San Ildefonso had 8,213 people in the 2024 census, up 16.1% from 2010.
People at each census since 1960

Counts from 2000 on are on today’s borders; earlier counts are as the place was then, so the line may step where a border moved.

San Ildefonso had the 26th most people of the 34 cities and municipalities of Ilocos Sur in 2024[1]
  1. 23Galimuyod10,263
  2. 24Quirino9,460
  3. 25San Esteban8,621
  4. 26San Ildefonso8,213
  5. 27Banayoyo7,953
  6. 28Alilem7,736
  7. 29San Emilio7,513
All 34 cities and municipalities of Ilocos Sur
In 2024, the 10 barangays with the most people held about 85 of every 100 of its people[2]
  1. Busiing Norte97112 in 100
  2. Bahet94311 in 100
  3. Sagsagat7389 in 100
  4. Bungro7339 in 100
  5. Busiing Sur7129 in 100
  6. Poblacion East7109 in 100
  7. Otol-Patac6278 in 100
  8. Poblacion West6027 in 100
  9. Iboy5096 in 100
  10. Dongalo4145 in 100
See all 15 barangays of San Ildefonso
Age structure · 2020 Census[32]People living in households, by age and sex
  • About 24 of every 100 are children under 15 (23.8%)
  • About 68 of every 100 are of working age, 15 to 64 (68%)
  • About 8 of every 100 are 65 or older (8.2%)
MenWomen

The figures by age

People by age group, men and women
AgePeopleMenWomen
0 - 4541291250
5 - 9665356309
10 - 14737360377
15 - 19753378375
20 - 24635330305
25 - 29735378357
30 - 34649325324
35 - 39572279293
40 - 44585298287
45 - 49499271228
50 - 54446232214
55 - 59375193182
60 - 64312149163
65 - 69249113136
70 - 7418178103
75 - 791114170
80 years and over1283494

Every figure, census by census

People, 2024 CensusCensusA count of every person in the country, all on one day. The 2024 census counted people as they were on 1 July 2024.More in the glossary
8,213[1, 2]
Households, 2024HouseholdA person living alone, or people who sleep in the same home and share their meals. A family may be one household or several.More in the glossary
2,137[1, 2]
People in each household, 2024
3.8 on average[1, 2]
Share of Ilocos Sur, 2024Rank and shareWorked out by Scene from the PSA's counts: where a place stands among the places listed with it, and how many of every 100 of its parent's people live in it.More in the glossary
1.16%[1]
In urban barangays, 2024Urban barangayThe PSA counts a barangay as urban when it has 5,000 people or more, or a big employer, or several businesses and public services close by. Every barangay in Metro Manila is urban.More in the glossary
11.5% (943 people)[5]
Men and women, 2020
4,106 men, 4,067 women[32]People living in households
Population at each census, with its source
CensusPopulationGrowth since the census beforeHouseholdsPeople per household
2024as of July 1, 20248,213[1, 2]0.07% a year2,1373.8
2020as of May 1, 20208,190[1]1.07% a year——
2015as of August 1, 20157,787[1]1.84% a year——
2010as of May 1, 20107,075[1]———
2007as of August 1, 2007; as it was then6,670[30]2.48% a year——
2000as of May 1, 2000; on today’s borders5,584[30, 31]1.40% a year——
1995as of September 1, 1995; as it was then5,232[30]2.74% a year——
1990as of May 1, 1990; as it was then4,528[30]2.21% a year——
1980as of May 1, 1980; as it was then3,640[30]2.30% a year——
1975as of May 1, 1975; as it was then3,249[30]−0.91% a year——
1970as of May 6, 1970; as it was then3,400[30]2.65% a year——
1960as of February 15, 1960; as it was then2,601[30]———

Barangays

San Ildefonso is made up of 15 barangays.
Barangays of San Ildefonso. Each column heading sorts the table.
[2, 3, 5, 6, 7]Share (2024)Urban or rural
Arnap2342.85%−1.00% a yearabout 0.70 km²Rural
Bahet94311.48%−1.16% a yearabout 0.982 km²Urban
Belen1141.39%−1.22% a yearabout 0.29 km²Rural
Bungro7338.92%1.53% a yearabout 2.87 km²Rural
Busiing Norte97111.82%0.94% a yearabout 0.786 km²Rural
Busiing Sur7128.67%1.69% a yearabout 0.469 km²Rural
Dongalo4145.04%2.14% a yearabout 0.456 km²Rural
Gongogong3193.88%−2.20% a yearabout 1.14 km²Rural
Iboy5096.2%2.09% a yearabout 0.37 km²Rural
Kinamantirisan2683.26%−2.35% a yearabout 0.517 km²Rural
Otol-Patac6277.63%1.18% a yearabout 1.17 km²Rural
Poblacion East7108.64%−0.40% a yearabout 0.891 km²Rural
Poblacion West6027.33%−0.55% a yearabout 0.132 km²Rural
Sagneb3193.88%−2.66% a yearabout 0.331 km²Rural
Sagsagat7388.99%−0.89% a yearabout 0.702 km²Rural

Areas are approximate: each is measured inside the barangay's border on UN OCHA's map, which is a guide, not the legal boundary.

Land & Environment

San Ildefonso covers 10.56 km² of land, 778 people for every km² in 2024. Its land rises to 51 m above the sea and it lies inland.
Land areaLand areaThe land inside the place's official boundary. A square kilometre is a square 1 km on each side, about the size of 140 football fields.More in the glossary
10.56 km²[6]As listed in the 2019 Masterlist of Land Areas (LMB, DENR)
Average density, 2024Population densityHow crowded a place is on average: its people divided by its land area. 1,000 people per square kilometre is 10 people per hectare, a square of 100 by 100 metres.More in the glossary
778 people per km²[6]
Coordinates
17.61854° N, 120.38909° E[3]The point inside its border farthest from every edge, so it always falls within the place.
Height above the sea[26]
Lowest
1 m
Average
12 m
Highest
51 m

Heights from the Copernicus DEM, a 30 m model of the surface: it reads the tops of trees and roofs, not the bare ground, over the land inside the border, the sea left out. Produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved.

Water, coast and peaks

No coastline: it lies inland.

Rivers[27]

  1. Bantaoay River7.0 of 13.7 km

Named rivers, lakes and peaks as OpenStreetMap mapped them on 30 September 2026, and the coast within 150 m of the border. Map data © OpenStreetMap contributors, under the Open Database License.

Climate

Climate typeClimate typePAGASA sorts the country's climate into four types by when the rain falls. Type I has a dry season from November to April and a wet one for the rest of the year; Type II has no dry season, with the most rain from December to February; Type III has a short dry season; Type IV has rain spread through the year.More in the glossary

Type I[28]

Two seasons: dry from November to April, wet for the rest of the year, with the heaviest rain from June to September.

Read by Scene off PAGASA's climate map, so approximate: the type that covers most of the place's land.

At Sinait, the nearest PAGASA station, 31 km away[29]Averages for 1991 to 2020: 2,172 mm of rain on 97 days a year; 27.4 °C on average

Rain each month Average temperature

The figures by month

Climate at Sinait, 1991 to 2020, by month
MonthRainRainy daysAverageHighLow
January6 mm225.7 °C30.2 °C21.2 °C
February3 mm226.2 °C30.7 °C21.6 °C
March5 mm227.4 °C31.8 °C23.0 °C
April17 mm228.7 °C33.0 °C24.3 °C
May173 mm929.0 °C33.0 °C24.9 °C
June282 mm1428.4 °C32.2 °C24.6 °C
July530 mm1927.7 °C31.3 °C24.1 °C
August614 mm1927.3 °C30.6 °C24.0 °C
September356 mm1527.4 °C31.0 °C23.8 °C
October135 mm727.4 °C31.4 °C23.4 °C
November46 mm427.3 °C31.5 °C23.2 °C
December6 mm226.6 °C30.9 °C22.3 °C
The year2,172 mm9727.4 °C31.5 °C23.4 °C

A station's figures describe the place around it only roughly: inland and in the hills it may be cooler and wetter. The station stands 58 m above the sea.

Life & Economy

About 11 of every 100 people lived below the poverty line in 2021.
Poverty, 2021Poverty incidenceHow many of every 100 people live in families whose income is below the poverty line: what a person needs in a year for food and other basic needs, as the PSA sets it for each province. It is an estimate, from a survey or, for a town, a statistical model, so the PSA gives a range it is likely to fall in.More in the glossary
10.5% of people[16]Below the poverty line, by the PSA's estimate for every town.
Income classIncome classThe Department of Finance sorts provinces, cities and municipalities into classes by their average yearly income over recent years: 1st class has the most. It measures the local government's income, not how well off its people are.More in the glossary
2nd class[4]
About 11 of every 100 people in San Ildefonso lived below the poverty line in 2021 (10.5%)[16]

The PSA's model for every town puts it between 7.7% and 13.4%, with 90% confidence.

The PSA rates this estimate's reliability as acceptable rather than high: read it as a guide.

Public places

  • 6government offices
  • 6schools
  • 2places of worship
  • 1market
  • 2parks

Counted from OpenStreetMap[3, 8]. Schools, places of worship, barangay halls and places known only by a common name, such as a chapel, are listed on each barangay's page.

As OpenStreetMap maps them on September 30, 2026. Map data © OpenStreetMap contributors, under the Open Database License.

Government & Leaders

A mayor leads San Ildefonso. Its local laws, called ordinances, are passed by the Sangguniang Bayan (the municipal council), led by the vice mayor. The mayor, the vice mayor and the council's elected members serve three-year terms, and none may serve more than three in a row.[10, 11]

Legislative districtLegislative districtThe area that elects one member of the House of Representatives. A big province or city may have several.More in the glossary
1st district of Ilocos Sur[14, 15]

Leaders

The mayor and vice mayor elected at each election since 2001, as COMELEC's lists of the elected name them, and those in office now, as the DILG's directory lists them.

  1. 2025–2028In office as of February 2026

    Mayor
    Amante Abaya Purisima II[17]
    Vice mayor
    Renato Purisima Pecho[17]

  2. 2022–2025

    Mayor
    Christian Daniel Abaya Purisima[18]
    Vice mayor
    Robert Raguindin Riego[18]

  3. 2019–2022

    Mayor
    Christian Daniel Abaya Purisima[19]
    Vice mayor
    Robert Raguindin Riego[19]

  4. 2016–2019

    Mayor
    Mark Anthony Abaya Purisima[20]
    Vice mayor
    Robert Raguindin Riego[20]

  5. 2013–2016

    Mayor
    Mark Anthony Abaya Purisima[21]
    Vice mayor
    Salvador Rosal Romano[21]

  6. 2010–2013

    Mayor
    Mark Anthony Abaya Purisima[22]
    Vice mayor
    Salvador Rosal Romano[22]

  7. 2007–2010

    Mayor
    Christian Daniel Abaya Purisima[23]
    Vice mayor
    Amante Abaya Purisima II[23]

  8. 2004–2007

    Mayor
    Amante Purisima II[24]
    Vice mayor
    Salvador Romano[24]

  9. 2001–2004

    Mayor
    Amante A. Purisima II[25]
    Vice mayor
    Juanita R. Anunciacion[25]
Mayors and vice mayors of San Ildefonso, by term
TermMayorVice mayor
2025–2028In office as of February 2026Amante Abaya Purisima II[17]Renato Purisima Pecho[17]
2022–2025Christian Daniel Abaya Purisima[18]Robert Raguindin Riego[18]
2019–2022Christian Daniel Abaya Purisima[19]Robert Raguindin Riego[19]
2016–2019Mark Anthony Abaya Purisima[20]Robert Raguindin Riego[20]
2013–2016Mark Anthony Abaya Purisima[21]Salvador Rosal Romano[21]
2010–2013Mark Anthony Abaya Purisima[22]Salvador Rosal Romano[22]
2007–2010Christian Daniel Abaya Purisima[23]Amante Abaya Purisima II[23]
2004–2007Amante Purisima II[24]Salvador Romano[24]
2001–2004Amante A. Purisima II[25]Juanita R. Anunciacion[25]

History & Identity

Timeline

  1. 8 October 1903

    Act No. 934 reduced the 24 municipalities of Ilocos Sur to 14. San Ildefonso was joined to Santo Domingo, and the seat of government was Santo Domingo.[9]

Nearby

San Ildefonso shares a border with Bantay, San Vicente and Santo Domingo.

How it compares

San Ildefonso beside Ilocos Sur, and where it stands among the cities and municipalities of Ilocos Sur.

San Ildefonso beside Ilocos Sur
FigureSan IldefonsoIlocos SurRank among the cities and municipalities of Ilocos Sur
People, 2024CensusA count of every person in the country, all on one day. The 2024 census counted people as they were on 1 July 2024.More in the glossary8,213[1, 2]709,99126th of 34
Growth a year, 2020–2024Growth a yearHow fast the number of people changed each year between two censuses. 1% a year means about 1 more person for every 100 people, each year.More in the glossary0.07% a year[1, 2]slower0.13% a year19th of 34
People per km², 2024Population densityHow crowded a place is on average: its people divided by its land area. 1,000 people per square kilometre is 10 people per hectare, a square of 100 by 100 metres.More in the glossary778[6]more crowded2687th of 34
Land areaLand areaThe land inside the place's official boundary. A square kilometre is a square 1 km on each side, about the size of 140 football fields.More in the glossary10.56 km²[6]2,651.49 km²33rd of 34
People in each household, 2024HouseholdA person living alone, or people who sleep in the same home and share their meals. A family may be one household or several.More in the glossary3.8[1, 2]about the same3.8not ranked
In urban barangays, 2024Urban barangayThe PSA counts a barangay as urban when it has 5,000 people or more, or a big employer, or several businesses and public services close by. Every barangay in Metro Manila is urban.More in the glossary11.5%[5]higher10.6%not ranked

How far, in a straight line[3]

Vigan City, the capital of Ilocos Sur
6.8 km south
Manila
343.1 km south

In a straight line between the points inside each place farthest from its edges, not by road.

The nearest towns and cities[3]

  1. San VicenteIlocos Sur2.5 km west
  2. Santa CatalinaIlocos Sur5.2 km southwest
  3. Vigan CityIlocos Sur6.8 km south
  4. Santo DomingoIlocos Sur7.0 km east
  5. BantayIlocos Sur8.3 km southeast
  6. CaoayanIlocos Sur9.1 km south

Sources

Page updated October 9, 2026. Sources checked by Scene October 8, 2026.
  1. 1.Philippine Statistics Authority. Population and Annual Population Growth Rate of the Philippines and its Regions, Provinces, and Highly Urbanized Cities Based on the 2010, 2015, 2020 and 2024 Population Census (OpenSTAT table 0211A6DAPG0). Published August 7, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  2. 2.Philippine Statistics Authority. Total Population, Household Population, and Number of Households by Province, City, Municipality, and Barangay as of 01 July 2024: Ilocos Region (OpenSTAT table 0011A6DTPH0). Published August 4, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  3. 3.UN OCHA, from the PSA and NAMRIA. Philippines: Subnational Administrative Boundaries (COD-AB), barangay layer. Published February 13, 2025. Read by Scene September 25, 2026. CC BY-IGO 3.0. Open the source
  4. 4.Philippine Statistics Authority. Philippine Standard Geographic Code (PSGC), 2nd Quarter 2026: Publication Datafile. Published June 30, 2026. Read by Scene September 24, 2026. CC BY (PSA Terms of Use). Open the source
  5. 5.Philippine Statistics Authority. Total Population and Urban Population by Urban Classification and Region, Province, Highly Urbanized City, City/Municipality and Barangay: Philippines, 2024 (OpenSTAT table 0231A6DPUP0). Published August 7, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  6. 6.Philippine Statistics Authority, from the Land Management Bureau (DENR). Population, Land Area, Population Density, and Percent Change in Population Density by Region, Province/Highly Urbanized City, and City/Municipality: 2015, 2020, and 2024 (OpenSTAT table 0221A6DLPD0). Published August 7, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  7. 7.Philippine Statistics Authority. Philippine Standard Geographic Code (PSGC), 4th Quarter 2022: Publication Datafile, with the 2015 and 2020 census counts (the PSA's file, as the Internet Archive keeps it). Published December 31, 2022. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  8. 8.OpenStreetMap contributors. Named public places in OpenStreetMap: schools, hospitals and health centres, places of worship, government offices, markets, stations, parks, beaches and monuments, from Geofabrik's extract of the Philippines. Published September 30, 2026. Read by Scene October 2, 2026. ODbL 1.0. Open the source
  9. 9.Philippine Commission (via The Lawphil Project). Act No. 934: An Act reducing the twenty-four municipalities of the Province of Ilocos Sur to fourteen. Published October 8, 1903. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  10. 10.Congress of the Philippines. Republic Act No. 7160: the Local Government Code of 1991. Published October 10, 1991. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  11. 11.1986 Constitutional Commission. The 1987 Constitution of the Republic of the Philippines. Published February 2, 1987. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  12. 12.Philippine Postal Corporation (PHLPost). ZIP Code Locator, as the Internet Archive captured it on 2022-05-21 (its SHA-1 matches the Archive's index). Published May 21, 2022. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1; a government-owned corporation's work is the Government's, Section 171.9). Open the source
  13. 13.Philippine Postal Corporation (PHLPost). Philippine ZIP Codes (the directory "ZipCode 2019.pdf", made 2019-12-02), as the Internet Archive keeps it (its SHA-1 matches the Archive's index). Published December 2, 2019. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1; a government-owned corporation's work is the Government's, Section 171.9). Open the source
  14. 14.1986 Constitutional Commission (text from the Chan Robles Virtual Law Library). Ordinance appended to the 1987 Constitution, apportioning the seats of the House of Representatives. Published February 2, 1987. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  15. 15.Commission on Elections (COMELEC). 2025 National and Local Elections: results, certificates of canvass of every province, city and municipality. Published May 2025. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  16. 16.Philippine Statistics Authority. Municipal and City Level Small Area Poverty Estimates; 2018 and 2021 (the PSA's workbook "2018 - 2021 SAE_with PSGC_noHUC.xlsx", sheet "2018-2021_NoHUC", as the Internet Archive keeps it). Published April 2, 2024. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  17. 17.Department of the Interior and Local Government (DILG). Directory of LGU Elective Officials for Term 2025-2028 as of February 2026 (its sheet: Consolidated List of Officials for Election Terms (2025-2028)), released through the FOI portal. Published February 2026. Read by Scene October 2, 2026. A work of the Government of the Philippines: RA 8293, Section 176 (no copyright subsists in it; exploiting it for profit needs the agency's prior approval). Open the source
  18. 18.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 9, 2022 National and Local Elections. Published December 23, 2025. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  19. 19.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 13, 2019 National and Local Elections. Published December 23, 2025. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  20. 20.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 9, 2016 National and Local Elections (its pages are headed "LIST OF ELECED CITY/MUNICIPAL CANDIDATES"). Published January 12, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  21. 21.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 13, 2013 National and Local Elections. Published January 12, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  22. 22.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 10, 2010 National and Local Elections. Published January 8, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  23. 23.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 14, 2007 National and Local Elections. Published January 14, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  24. 24.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 10, 2004 National and Local Elections (its pages are headed "LIST OF CITY/MUNICIPAL CANDIDATES"). Published January 14, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  25. 25.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 14, 2001 National and Local Elections. Published January 8, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  26. 26.European Union and the European Space Agency (Copernicus), from DLR and Airbus Defence and Space (WorldDEM). Copernicus DEM GLO-30: global digital surface model at 30 m, one-degree tiles (2021 release). Published 2021. Read by Scene October 2, 2026. Copernicus DEM GLO-30 licence: free, any use including commercial, with the Copernicus notice. Open the source
  27. 27.OpenStreetMap contributors, extract by Geofabrik. Named rivers, lakes, reservoirs, peaks and the coastline of the Philippines in OpenStreetMap (Geofabrik extract, cut by osmium). Published September 30, 2026. Read by Scene October 2, 2026. ODbL 1.0. Open the source
  28. 28.Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), Climatology and Agrometeorology Division. Climate Map of the Philippines (1951-2010), Modified Coronas Climate Classification. Published August 2014. Read by Scene October 2, 2026. A work of the Government of the Philippines: no copyright (RA 8293 s.176.1); PAGASA's approval is needed to use it for profit. Open the source
  29. 29.Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), Climatology and Agrometeorology Division. Climatological Normals, 1991-2020, by synoptic station (one PDF each). Published January 2022. Read by Scene October 2, 2026. A work of the Government of the Philippines: no copyright (RA 8293 s.176.1); PAGASA's approval is needed to use it for profit. Open the source
  30. 30.Philippine Statistics Authority. 2015 Census of Population, Statistical Tables, Table 1: Population Enumerated in Various Censuses by City/Municipality, 1960-2015 (one workbook for each province, highly urbanized city and region). Published 2017. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  31. 31.Philippine Statistics Authority. 2020 Census of Population and Housing: Table A (Population and Annual Growth Rate for the Philippines and its Regions, Provinces and Highly Urbanized Cities) and Table B (Population and Annual Growth Rates by Province, City and Municipality, by Region). Published July 2021. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  32. 32.Philippine Statistics Authority. 2020 Census of Population and Housing: Household Population by Age Group and Sex, for the Philippines and its regions, provinces, cities and municipalities (revised file, psa.gov.ph/system/files/phcd/2022-12/). Published December 2022. Read by Scene October 8, 2026. CC BY (PSA Terms of Use). Open the source

Scene adds what the sources do not print themselves: growth rates, shares, barangay areas and densities, coordinates, neighbours and distances, each computed from the figures and borders above. How each is made.

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Cite this page

Scene.ph. “San Ildefonso, Ilocos Sur.” Scene Atlas. Updated October 9, 2026. https://scene.ph/atlas/ilocos-sur/san-ildefonso