San Guillermo

San Guillermo
Municipality of San Guillermo
Map of Isabela with San Guillermo highlighted
OpenStreetMap
San Guillermo
Location within the Philippines
Coordinates: 16°43′28″N 121°48′36″E / 16.7244°N 121.81°E / 16.7244; 121.81
CountryPhilippines
RegionCagayan Valley
ProvinceIsabela
District 6th district
FoundedJune 17, 1967
Named afterEugenio Guillermo
Barangays26 (see Barangays)
Government
  TypeSangguniang Bayan
  MayorFelipe N. Guyud, Jr.
  Vice MayorBernadine M. Lucas
  RepresentativeFaustino A. Dy V
  Electorate13,806 voters (2025)
Area
  Total
325.49 km2 (125.67 sq mi)
Elevation
88 m (289 ft)
Highest elevation
128 m (420 ft)
Lowest elevation
43 m (141 ft)
Population
 (2020 census)
  Total
20,915
  Density64/km2 (170/sq mi)
  Households
4,989
Economy
  Income class4th municipal income class
  Poverty incidence
22.09
% (2021)
  Revenue205.6 million (2022)
  Assets497.9 million (2022)
  Expenditure128.8 million (2022)
  Liabilities119.3 million (2022)
Service provider
  ElectricityIsabela 1 Electric Cooperative (ISELCO 1)
Time zoneUTC+8 (PST)
ZIP code
3308
PSGC
IDD:area code+63(0)78
Native languagesIlocano
Tagalog
Websitewww.sanguillermo-isabela.gov.ph

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.