San Ildefonso, Ilocos Sur
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San Ildefonso, officially the Municipality of San Ildefonso (Ilocano: Ili ti San Ildefonso; Filipino: Bayan ng San Ildefonso), is a 5th class municipality in the province of Ilocos Sur, Philippines. According to the 2015 census, it has a population of 7,787 people. 
|Municipality of San Ildefonso|
Parish Church of San Ildefonso, Ilocos Sur in June 2005
Map of Ilocos Sur with San Ildefonso highlighted
|Barangays||15 (see Barangays)|
|• Type||Sangguniang Bayan|
|• Mayor||Christian Daniel A. Purisima|
|• Vice Mayor||Robert R. Riego|
|• Representative||Deogracias Victor B. Savellano|
|• Electorate||5,541 voters (2019)|
|• Total||11.35 km2 (4.38 sq mi)|
|Elevation||10 m (30 ft)|
(2015 census) 
|• Density||690/km2 (1,800/sq mi)|
|• Income class||5th municipal income class|
|• Poverty incidence||10.16% (2015)|
|• Revenue||₱73,904,829.68 (2016)|
|• Electricity||Ilocos Sur Electric Cooperative (ISECO)|
|Time zone||UTC+8 (PST)|
|IDD : area code||+63 (0)77|
|Climate type||tropical monsoon climate|
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.
Etymology and HistoryEdit
San Ildefonso, like many other places in the provinces at the beginning of the Spanish Regime, did not have a name. Sometime in 1625, its 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.
San Ildefonso is politically subdivided into 15 barangays.
- Busiing Sur
- Busiing Norte
- Poblacion East
- Poblacion West
|Climate data for San Ildefonso, Ilocos Sur|
|Average high °C (°F)||30
|Average low °C (°F)||19
|Average precipitation mm (inches)||9
|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) |
|Source: Philippine Statistics Authority   |
In the 2015 census, the population of San Ildefonso, Ilocos Sur, was 7,787 people,  with a density of 690 inhabitants per square kilometre or 1,800 inhabitants per square mile.
Municipal Officials Year 2000-2013:
- Mayor: Mark Anthony A. Purisima
- Vice Mayor: RoBert Castillo
- Sanguniang Bayan Members:
- Rosario Castillo
- Quirino Dela Cruz
- Mely Dela Cruz
- Jay-ar Riego
- Renato Pecho
- Romeo Palomares
- Minda Padua
- Maraino Pamo Jr.
- ABC Pres. Efren Pula
- SK Federation Pres. Maricar Pati
- Belen National High School
- San Ildefonso Central School
- Bungro Elementary School
- Sagsagat Elementary School
- Busiing Elementary School
- Philippine Science High School - Ilocos Region Campus
- Day Care Centers (different barangays)
200th Anniversary of Basi RevoltEdit
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.
- Municipality of San Ildefonso | (DILG)
- "Province: Ilocos Sur". PSGC Interactive. Quezon City, Philippines: Philippine Statistics Authority. Retrieved 12 November 2016.
- Census of Population (2015). "Region I (Ilocos Region)". Total Population by Province, City, Municipality and Barangay. PSA. Retrieved 20 June 2016.
- "PSA releases the 2015 Municipal and City Level Poverty Estimates". Quezon City, Philippines. Retrieved 1 January 2020.
- "San Ildefonso: Average Temperatures and Rainfall". Meteoblue. Retrieved 14 May 2020.
- Census of Population and Housing (2010). "Region I (Ilocos Region)". Total Population by Province, City, Municipality and Barangay. NSO. Retrieved 29 June 2016.
- Censuses of Population (1903–2007). "Region I (Ilocos Region)". Table 1. Population Enumerated in Various Censuses by Province/Highly Urbanized City: 1903 to 2007. NSO.
- "Province of Ilocos Sur". Municipality Population Data. Local Water Utilities Administration Research Division. Retrieved 17 December 2016.
- Abs-Cbn Interactive, Ilocanos mark 200 yrs. of Basi Revolt[permanent dead link]