San Agustin, Isabela

San Agustin
Municipality of San Agustin
Nickname: 
Crossbred Capital of the Philippines
Map of Isabela with San Agustin highlighted
Interactive map of San Agustin
San Agustin
Location within the Philippines
Coordinates: 16°31′N 121°45′E / 16.52°N 121.75°E / 16.52; 121.75
CountryPhilippines
RegionCagayan Valley
ProvinceIsabela
District 4th district
Named afterSt. Augustine of Hippo
Barangays23 (see Barangays)
Government
 • TypeSangguniang Bayan
 • MayorCesar A. Mondala
 • Vice MayorOliver D. Micu
 • RepresentativeJoseph S. Tan
 • Electorate15,378 voters (2025)
Area
 • Total
278.40 km2 (107.49 sq mi)
Elevation
125 m (410 ft)
Highest elevation
309 m (1,014 ft)
Lowest elevation
84 m (276 ft)
Population
 (2024 census)
 • Total
22,228
 • Density79.842/km2 (206.79/sq mi)
 • Households
5,544
Economy
 • Income class3rd municipal income class
 • Poverty incidence
11.83
% (2021)
 • Revenue₱ 195.3 million (2022)
 • Assets₱ 410 million (2022)
 • Expenditure₱ 143.9 million (2022)
 • Liabilities₱ 42.87 million (2022)
Service provider
 • ElectricityIsabela 1 Electric Cooperative (ISELCO 1)
Time zoneUTC+8 (PST)
ZIP code
3314
PSGC
IDD:area code+63 (0)78
Native languagesIlocano
Bugkalot
Tagalog
Websitewww.sanagustin-isabela.gov.ph

San Agustin, officially the Municipality of San Agustin (Ilocano: Ili ti San Agustin; Tagalog: Bayan ng San Agustin), is a municipality in the province of Isabela, Philippines. According to the 2024 census, it has a population of 22,228 people.