Siay

Siay
Municipality of Siay
Map of Zamboanga Sibugay with Siay highlighted
Interactive map of Siay
Siay
Location within the Philippines
Coordinates: 7°42′20″N 122°51′51″E / 7.705614°N 122.864094°E / 7.705614; 122.864094
CountryPhilippines
RegionZamboanga Peninsula
ProvinceZamboanga Sibugay
District 2nd district
FoundedDecember 28, 1956
Barangays29 (see Barangays)
Government
 • TypeSangguniang Bayan
 • MayorJarvis M. Acosta
 • Vice MayorJulius M. Acosta Jr.
 • RepresentativeDr. Marly T. Hofer-Hasim
 • Municipal Council
Members
  • Emma E. Bagaforo
  • Cerses P. Ebol
  • Rogie S. Enriquez
  • Jimmy S. Cañete
  • Ritche C. Paster
  • Juan G. Tumampos
  • Romeo P. Tenerife
  • Joelly D. Sasota
 • Electorate25,960 voters (2025)
Area
 • Total
313.66 km2 (121.10 sq mi)
Elevation
34 m (112 ft)
Highest elevation
222 m (728 ft)
Lowest elevation
−3 m (−9.8 ft)
Population
 (2024 census)
 • Total
43,233
 • Density137.83/km2 (356.99/sq mi)
 • Households
10,096
Economy
 • Income class2nd municipal income class
 • Poverty incidence
31.52
% (2021)
 • Revenue₱ 273.1 million (2022)
 • Assets₱ 378.2 million (2022)
 • Expenditure₱ 263.5 million (2022)
 • Liabilities₱ 55.5 million (2022)
Service provider
 • ElectricityZamboanga del Sur 2 Electric Cooperative (ZAMSURECO 2)
Time zoneUTC+8 (PST)
ZIP code
7006
PSGC
IDD:area code+63 (0)62
Native languagesSubanon
Cebuano
Chavacano
Tagalog
Websitewww.siaysibugay.gov.ph

Siay, officially the Municipality of Siay (Cebuano: Lungsod sa Siay; Chavacano: Municipalidad de Siay; Tagalog: Bayan ng Siay), is a municipality in the province of Zamboanga Sibugay, Philippines. According to the 2024 census, it has a population of 43,233 people.

The municipality is located in the 2nd District and the eastern part of the province of Zamboanga Sibugay. It is 38 kilometers from Ipil, 220 kilometers to Dipolog, and 180 kilometers east to Zamboanga City. It is geographically situated within a map coordination of 741 east & 122* 53*west.

Siay is bounded from the north by the municipality of Diplahan, south by the Sibuguey Bay, west by the municipality of Kabasalan, and east by the municipality of Imelda.