San Agustin, Surigao del Sur

San Agustin
Municipality of San Agustin
Britania Islets at the Lianga Bay in San Agustin
Nickname: 
Heart of Surigao del Sur
Map of Surigao del Sur with San Agustin highlighted
Interactive map of San Agustin
San Agustin
Location within the Philippines
Coordinates: 8°44′37″N 126°13′17″E / 8.743664°N 126.221433°E / 8.743664; 126.221433
CountryPhilippines
RegionCaraga
ProvinceSurigao del Sur
District 1st district
Barangays13 (see Barangays)
Government
 • TypeSangguniang Bayan
 • MayorLibertad O. Alameda
 • Vice MayorMamerta P. Milo
 • RepresentativeRomeo S. Momo Sr.
 • Electorate15,281 voters (2025)
Area
 • Total
277.28 km2 (107.06 sq mi)
Elevation
35 m (115 ft)
Highest elevation
384 m (1,260 ft)
Lowest elevation
0 m (0 ft)
Population
 (2024 census)
 • Total
23,612
 • Density85.156/km2 (220.55/sq mi)
 • Households
4,964
Economy
 • Income class4th municipal income class
 • Poverty incidence
34.65
% (2021)
 • Revenue₱ 260.8 million (2022)
 • Assets₱ 260 million (2022)
 • Expenditure₱ 225.4 million (2022)
 • Liabilities₱ 81.63 million (2022)
Service provider
 • ElectricitySurigao del Sur 2 Electric Cooperative (SURSECO 2)
Time zoneUTC+8 (PST)
ZIP code
8305
PSGC
IDD:area code+63 (0)86
Native languagesSurigaonon
Agusan
Cebuano
Kamayo
Tagalog
Websitewww.sanagustin.info

San Agustin, officially the Municipality of San Agustin (Surigaonon: Lungsod nan San Agustin; Tagalog: Bayan ng San Agustin), is a municipality in the province of Surigao del Sur, Philippines. According to the 2020 census, it has a population of 22,855 people.

It was established as the municipality of Oteiza on June 16, 1962, by virtue of Republic Act No. 3489, from the municipality of Marihatag; it acquired its current name on June 17, 1967, by virtue of Republic Act No. 4903.

The town is famous for the Britania Group of Islands (or simply Britania Islets), a group of 24 islands with white sandbar beaches scattered across waters of the Lianga Bay, overlooking the Philippine Sea.