# San Guillermo

San Guillermo (Spanish for Saint William), officially the Municipality of San Guillermo, is a municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 20,915 people.

## Etymology

The town was named after Eugenio Guillermo, former mayor of Angadanan.

## History

On June 17, 1967, the municipality of San Guillermo was created by virtue of Republic Act No. 4906, sponsored by Melanio Singson, the then-representative of Isabela's lone district. It used to consist of 15 barangays from Angadanan (i.e. Anonang, Colorado, Calaoagan, Dipacamo, Peredo Edcor, Guam, Nakar, Palawan, Progreso, San Francisco Norte, San Mariano Norte, San Mariano Sur, Villa Rose, Villa Sanchez, and Villa Teresita) and four from Echague (i.e. Aringay, Dingading, San Francisco Sur and Sinalugan).
Due to a noticeable increase in the rate of population migration and potential economic growth, additional barangays were created during the term of Mayor Alvaro Filart, such as barangays Burgos, Dietban, Estrella, Rizal, San Rafael and Villa Remedios. Subsequently, barangay Peredo Edcor was split into two barangays, namely: Centro 1 and Centro 2, which is now the poblacion and the municipality's official seat.

## Geography
### Barangays

San Guillermo is politically subdivided into 26 barangays.  Each barangay consists of puroks while some have sitios.
* Anonang
* Aringay
* Burgos
* Calaoagan
* Centro 1 (Poblacion)
* Centro 2 (Poblacion)
* Colorado
* Dietban
* Dingading
* Dipacamo
* Estrella
* Guam
* Nakar
* Palawan
* Progreso
* Rizal
* San Francisco Norte
* San Francisco Sur
* San Mariano Norte
* San Mariano Sur
* San Rafael
* Sinalugan
* Villa Remedios
* Villa Rose
* Villa Sanchez
* Villa Teresita

### Climate

Climate data for San Guillermo, Isabela :
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Mean daily maximum °C (°F) | 29 (84) | 30 (86) | 32 (90) | 35 (95) | 35 (95) | 35 (95) | 34 (93) | 33 (91) | 32 (90) | 31 (88) | 30 (86) | 28 (82) | 32 (90) |
| Mean daily minimum °C (°F) | 19 (66) | 20 (68) | 21 (70) | 23 (73) | 23 (73) | 24 (75) | 23 (73) | 23 (73) | 23 (73) | 22 (72) | 21 (70) | 20 (68) | 22 (71) |
| Average precipitation mm (inches) | 31.2 (1.23) | 23 (0.9) | 27.7 (1.09) | 28.1 (1.11) | 113.5 (4.47) | 141.4 (5.57) | 176.4 (6.94) | 236.6 (9.31) | 224.9 (8.85) | 247.7 (9.75) | 222.9 (8.78) | 178 (7.0) | 1,651.4 (65) |
| Average rainy days | 10 | 6 | 5 | 5 | 13 | 12 | 15 | 15 | 15 | 17 | 16 | 15 | 144 |
| Source: World Weather Online ||||||||||||||

## Demographics

In the 2020 census, the population of San Guillermo, Isabela, was 20,915 people, with a density of 64 inhabitants per square kilometre or 170 inhabitants per square mile.

## Economy

Poverty incidence of San Guillermo
* 10
* 20
* 30
* 40
* 50
* 60
* 2000 50.89
* 2003 33.43
* 2006 36.10
* 2009 21.62
* 2012 27.61
* 2015 23.53
* 2018 27.20
* 2021 22.09
* Source: Philippine Statistics Authority

## Government
### Local government

As a municipality in the Province of Isabela, government officials at the provincial and municipal levels are voted by the town. The provincial government has political jurisdiction over most local transactions of the municipal government.
The Municipality of San Guillermo 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 municipal councilors are elected directly through elections held every three years.
Barangays are also headed by elected officials: Barangay Captain, Barangay Council, whose members are called Barangay Councilors. The barangays have SK federation which represents the barangay, headed by SK chairperson and whose members are called SK councilors. All officials are also elected every three years.

### Elected officials

Members of the San Guillermo Municipal Council (2022-2025) :
| Position | Name |
| District Representative | Faustino A. Dy V |
| Municipal Mayor | Felipe N. Guyud, Jr. |
| Municipal Vice-Mayor | Bernardine M. Lucas |
| Municipal Councilors | Marilou N. Sanchez |
| Municipal Councilors | John N. Sanchez |
| Municipal Councilors | Harrison S. Guyud |
| Municipal Councilors | Jolly A. De Guzman |
| Municipal Councilors | Florido N. Marcos |
| Municipal Councilors | Ricardo G. Castañeda |
| Municipal Councilors | Marcelina L. Cabaero |
| Municipal Councilors | Emmanuel N. Guyud |

### Congress representation

San Guillermo, belonging to the sixth legislative district of the province of Isabela, currently represented by Hon. Faustino A. Dy V.

## Education

The Schools Division of Isabela governs the town's public education system. The division office is a field office of the DepEd in Cagayan Valley region. The office governs the public and private elementary and public and private high schools throughout the municipality.