San Ildefonso, Ilocos Sur

Municipality in Ilocos Sur, Philippines

For municipality of Bulacan, see San Ildefonso, Bulacan.

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Municipality in Ilocos Region, Philippines

San Ildefonso

Municipality

Municipality of San Ildefonso

Parish Church of San Ildefonso

Flag

Motto:

Progreso San Ildefonso! (Progress San Ildefonso)

Map of Ilocos Sur with San Ildefonso highlighted

OpenStreetMap

San Ildefonso

Location within the Philippines

Coordinates: 17°37′38″N 120°23′38″E﻿ / ﻿17.6272°N 120.3939°E﻿ / 17.6272; 120.3939
Country| Philippines
Region| Ilocos Region
Province| Ilocos Sur
District|  1st district
Founded| March 1625
Named after| Saint Ildefonsus
Barangays| 15 (see Barangays)
Government

[1]

• Type| Sangguniang Bayan
• Mayor| Christian Daniel A. Purisima
• Vice Mayor| Robert R. Riego
• Representative| Deogracias Victor B. Savellano
• Municipal Council|

Members

*   * Nona T. Purisima
* Mariano M. Pamo Jr.
* Luzminda D. Padua
* Nelson T. Retreta
* Efren J. Pola
* Renato P. Pecho
* Richard A. Palomares
* Cesar R. Revibes

• Electorate| 6,198 voters (2025)
Area

[2]

• Total

| 11.35 km2 (4.38 sq mi)
Elevation

| 10 m (30 ft)
Highest elevation

| 47 m (154 ft)
Lowest elevation

| 0 m (0 ft)
Population

(2024 census)[3]

• Total

| 8,213
• Density| 720/km2 (1,900/sq mi)
• Households

| 1,976
Economy

• Income class| 5th municipal income class
• Poverty incidence|

14.06

% (2021)[4]
• Revenue| ₱ 195.8 million (2022)
• Assets| ₱ 624.9 million (2022)
• Expenditure| ₱ 143.9 million (2022)
• Liabilities| ₱ 46.18 million (2022)
Service provider

• Electricity| Ilocos Sur Electric Cooperative (ISECO)
Time zone| UTC+8 (PST)
ZIP code|

2728

PSGC|

0102919000

IDD : area code | +63 (0)77
Native languages| Ilocano
Tagalog

San Ildefonso, officially the Municipality of San Ildefonso (Ilocano: Ili ti San Ildefonso; Filipino: Bayan ng San Ildefonso), is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census, it has a population of 8,190 people.[5] The town was named after Saint Ildephonsus, a 7th century scholar and theologian.

## History

[edit]

San Ildefonso, like many other places in the provinces at the beginning of the Spanish Regime, did not have a name. Stories have it that sometime in 1625, the town's inhabitants decided to give it a name, but nothing came out after more than five hours of discussions. So while thinking of a name, they decided to go fishing for a week. And while preparing to go fishing, they saw a box floating not far from shore. Wading to reach the box and carrying it ashore, they opened the box to find a statue of Saint Ildephonsus.

The young women of the place carried the statue to the center of the village, where it was enshrined in a small hut for many years. He became the patron saint of the municipality, and his name was decided to become the name of the fledgling municipality.

San Ildefonso was a former rancheria of Bantay before it became a municipality, but because of its size it was annexed to Santo Domingo as a barrio. In 1921, Assemblyman (and future Philippine president) Elpidio Quirino worked to convert San Ildefonso into a municipality again.

### 200th Anniversary of Basi Revolt

[edit]

On September 28, 2007, San Ildefonso officials (Governor Deogracias Victor Savellano and Rep. Ronald Singson) commemorated the Basi Revolt. Recently, the Sangguniang Bayan of San Ildefonso approved a resolution declaring September 16 as a non-working holiday and named the old road in Barangay Gongogong as Ambaristo street in honor of Pedro Ambaristo, leader of the Basi Revolt. Mayor Christian Purisima enrolled basi as their entry into the “One Town; One Product” (OTOP) program of Governor Savellano.[6]

## Geography

[edit]

San Ildefonso is situated 6.58 kilometres (4.09 mi) from the provincial capital Vigan, and 408.65 kilometres (253.92 mi) from the country's capital city of Manila.

### Barangays

[edit]

San Ildefonso is politically subdivided into 15 barangays. Each barangay consists of puroks and some have sitios.

* Arnap
* Bahet
* Belen
* Bungro
* Busiing Norte
* Busiing Sur
* Dongalo
* Gongogong
* Iboy
* Kinamantirisan
* Otol-Patac
* Poblacion East
* Poblacion West
* Sagneb
* Sagsagat

### Climate

[edit]

Climate data for San Ildefonso, Ilocos Sur

Month  | Jan  | Feb  | Mar  | Apr  | May  | Jun  | Jul  | Aug  | Sep  | Oct  | Nov  | Dec  | Year
Mean daily maximum °C (°F)  | 30
(86)  | 31
(88)  | 33
(91)  | 34
(93)  | 33
(91)  | 31
(88)  | 30
(86)  | 30
(86)  | 30
(86)  | 31
(88)  | 30
(86)  | 29
(84)  | 31
(88)
Mean daily minimum °C (°F)  | 19
(66)  | 19
(66)  | 21
(70)  | 23
(73)  | 25
(77)  | 25
(77)  | 24
(75)  | 24
(75)  | 24
(75)  | 22
(72)  | 21
(70)  | 19
(66)  | 22
(72)
Average precipitation mm (inches)  | 9
(0.4)  | 11
(0.4)  | 13
(0.5)  | 23
(0.9)  | 92
(3.6)  | 122
(4.8)  | 153
(6.0)  | 137
(5.4)  | 139
(5.5)  | 141
(5.6)  | 42
(1.7)  | 14
(0.6)  | 896
(35.4)
Average rainy days  | 4.6  | 4.0  | 6.2  | 9.1  | 19.5  | 23.2  | 24.0  | 22.5  | 21.5  | 15.2  | 10.5  | 6.0  | 166.3
Source: Meteoblue (modeled/calculated data, not measured locally)[7]

## Demographics

[edit]

Population census of San IldefonsoYear| Pop.| ±% p.a.

|
|

1903 | 2,137| —
1939 | 2,227| +0.11%
1948 | 2,034| −1.00%
1960 | 2,601| +2.07%
1970 | 3,400| +2.71%
1975 | 3,249| −0.91%
1980 | 3,640| +2.30%
1990 | 4,528| +2.21%
1995 | 5,232| +2.74%
2000 | 5,584| +1.41%
2007 | 6,670| +2.48%
2010 | 7,075| +2.17%
2015 | 7,787| +1.84%
2020 | 8,190| +1.07%
2024 | 8,213| +0.07%
Source: Philippine Statistics Authority[8][9][10][11][12]

In the 2020 census, San Ildefonso had a population of 8,190.[13] The population density was 720 inhabitants per square kilometre (1,900/sq mi).

## Economy

[edit]

Poverty incidence of San Ildefonso

2000
32.00

2003
17.13

2006
16.80

2009
15.36

2012
10.36

2015
10.16

2018
3.84

2021
14.06

Source: Philippine Statistics Authority[14][15][16][17][18][19][20][21]

The town is rich in rice, corn, sugarcane, malunggay, katuday & fruit-bearing trees such as star apple, chico, mango, camachile & atis. Its main product is basi, a wine made from fermented sugarcane juice; as well as cane vinegar. They also make nutritious ice cream made up of vegetables in Barangay Bungro, and is being popularized by the town's local government.

## Government

[edit]

### Local government

[edit]

Main article: Sangguniang Bayan

San Ildefonso, belonging to the first congressional district of the province of Ilocos Sur, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code. The mayor, vice mayor, and the councilors are elected directly by the people through an election which is being held every three years.

### Elected officials

[edit]

Members of the Municipal Council
(2019–2022)[22] Position  | Name

|

Congressman  | Deogracias Victor B. Savellano
Mayor  | Christian Daniel A. Purisima
Vice-Mayor  | Robert R. Riego
Councilors  | Nona T. Purisima
Mariano M. Pamo Jr.
Luzminda D. Padua
Nelson T. Retreta
Efren J. Pola
Renato P. Pecho
Richard A. Palomares
Cesar R. Revibes

## Education

[edit]

The Sto. Domingo-San Ildefonso Schools District Office governs all educational institutions within the municipality. They also oversee the operations of all private and public elementary and high schools located in Santo Domingo, Ilocos Sur.[23]

### Primary and elementary schools

[edit]

* Bungro Elementary School
* Busiing Elementary School
* Sagsagat Elementary School
* San Ildefonso Central School

### Secondary schools

[edit]

* Belen National High School
* Philippine Science High School - Ilocos Region Campus

## References

[edit]

1. ^ Municipality of San Ildefonso |  (DILG)
2. ^ "2015 Census of Population, Report No. 3 – Population, Land Area, and Population Density" (PDF). Philippine Statistics Authority. Quezon City, Philippines. August 2016. ISSN 0117-1453. Archived (PDF) from the original on May 25, 2021. Retrieved July 16, 2021.
3. ^ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
4. ^ "PSA Releases the 2021 City and Municipal Level Poverty Estimates". Philippine Statistics Authority. 2 April 2024. Retrieved 28 April 2024.
5. ^ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
6. ^ Abs-Cbn Interactive, Ilocanos mark 200 yrs. of Basi Revolt[permanent dead link]
7. ^ "San Ildefonso: Average Temperatures and Rainfall". Meteoblue. Retrieved 14 May 2020.
8. ^ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
9. ^ Census of Population (2015). "Region I (Ilocos Region)". Total Population by Province, City, Municipality and Barangay. Philippine Statistics Authority. Retrieved 20 June 2016.
10. ^ Census of Population and Housing (2010). "Region I (Ilocos Region)" (PDF). Total Population by Province, City, Municipality and Barangay. National Statistics Office. Retrieved 29 June 2016.
11. ^ Censuses of Population (1903–2007). "Region I (Ilocos Region)". Table 1. Population Enumerated in Various Censuses by Province/Highly Urbanized City: 1903 to 2007. National Statistics Office.
12. ^ "Province of". Municipality Population Data. Local Water Utilities Administration Research Division. Retrieved 17 December 2016.
13. ^ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
14. ^ "Poverty incidence (PI):". Philippine Statistics Authority. Retrieved December 28, 2020.
15. ^ "Estimation of Local Poverty in the Philippines" (PDF). Philippine Statistics Authority. 29 November 2005.
16. ^ "2003 City and Municipal Level Poverty Estimates" (PDF). Philippine Statistics Authority. 23 March 2009.
17. ^ "City and Municipal Level Poverty Estimates; 2006 and 2009" (PDF). Philippine Statistics Authority. 3 August 2012.
18. ^ "2012 Municipal and City Level Poverty Estimates" (PDF). Philippine Statistics Authority. 31 May 2016.
19. ^ "Municipal and City Level Small Area Poverty Estimates; 2009, 2012 and 2015". Philippine Statistics Authority. 10 July 2019.
20. ^ "PSA Releases the 2018 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 15 December 2021. Retrieved 22 January 2022.
21. ^ "PSA Releases the 2021 City and Municipal Level Poverty Estimates". Philippine Statistics Authority. 2 April 2024. Retrieved 28 April 2024.
22. ^ "2019 National and Local Elections" (PDF). Commission on Elections. Retrieved March 11, 2022.
23. ^ "Mastelist of Schools" (PDF). Department of Education. January 15, 2021. Retrieved April 18, 2025.

## External links

[edit]

* Pasyalang Ilocos Sur
* Philippine Standard Geographic Code
* Philippine Census Information
* Local Governance Performance Management System

Places adjacent to San Ildefonso, Ilocos Sur

|  | Santo Domingo |

|
|

|  |
San Vicente |

San Ildefonso

| Bantay
|  |
| Bantay |

* v
* t
* e

Province of Ilocos Sur

Vigan (capital)
Candon (largest city)

Municipalities|

* Alilem
* Banayoyo
* Bantay
* Burgos
* Cabugao
* Caoayan
* Cervantes
* Galimuyod
* Gregorio del Pilar
* Lidlidda
* Magsingal
* Nagbukel
* Narvacan
* Quirino
* Salcedo
* San Emilio
* San Esteban
* San Ildefonso
* San Juan
* San Vicente
* Santa
* Santa Catalina
* Santa Cruz
* Santa Lucia
* Santa Maria
* Santiago
* Santo Domingo
* Sigay
* Sinait
* Sugpon
* Suyo
* Tagudin

Component cities|

* Candon
* Vigan

Barangays|

See: List of barangays in Ilocos Sur

Authority control databases

International|

* VIAF

National|

* United States
* Israel

*[PSGC]: Philippine Standard Geographic Code
*[Pop.]: Population
*[±% p.a.]: Per annum growth rate. Executive Order 135 §6 states that for "census years" (years divisible by 10) the reference date would be May 1st, but for all other years, the reference date is to be the "middle of the year". This means that growth rates, although correct, are not necessarily simple year-on-year comparisons.
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template