Siay

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 2020 census, it has a population of 40,585 people.^[5]

Siay
Municipality
Municipality of Siay
Flag Seal
Map of Zamboanga Sibugay with Siay highlighted
OpenStreetMap
Siay Location within the Philippines
Coordinates: 7°42′20″N 122°51′51″E
Country	Philippines
Region	Zamboanga Peninsula
Province	Zamboanga Sibugay
District	2nd district
Founded	December 28, 1956
Barangays	29 (see Barangays)
Government  [1]
• Type	Sangguniang Bayan
• Mayor	Jarvis M. Acosta
• Vice Mayor	Julius M. Acosta Jr.
• Representative	Dr. 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
• Electorate	25,960 voters (2025)
Area [2]
• Total	313.66 km2 (121.10 sq mi)
Elevation	34 m (112 ft)
Highest elevation	222 m (728 ft)
Lowest elevation	−3 m (−10 ft)
Population  (2024 census)[3]
• Total	43,233
• Density	140/km2 (360/sq mi)
• Households	10,096
Economy
• Income class	2nd municipal income class
• Poverty incidence	31.52 % (2021)[4]
• Revenue	₱ 273.1 million (2022)
• Assets	₱ 378.2 million (2022)
• Expenditure	₱ 263.5 million (2022)
• Liabilities	₱ 55.5 million (2022)
Service provider
• Electricity	Zamboanga del Sur 2 Electric Cooperative (ZAMSURECO 2)
Time zone	UTC+8 (PST)
ZIP code	7006
PSGC	0908313000
IDD : area code	+63 (0)62
Native languages	Subanon Cebuano Chavacano Tagalog
Website	www.siaysibugay.gov.ph

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.

History

The municipality was created through Executive Order No. 223, signed by President Ramon Magsaysay on December 28, 1956, consisting twenty-six barrios and sitios of Kabasalan, including Barrio Siay which was designated as the seat of government, and another six in Malangas, all then located in Zamboanga del Sur.^[6]

Siay had its territory reduced in November 1977 with the detachment of twenty-two barangays; thirteen were organized into the new municipality of Payao,^[7] while another nine, along with parts of Malangas and Alicia, were constituted into Imelda.^[8]

Geography

Barangays

Siay is politically subdivided into 29 barangays. Each barangay consists of puroks while some have sitios.

• Bagongsilang
• Balagon
• Balingasan
• Balucanan
• Bataan (Dacanay)
• Batu
• Buyogan
• Camanga
• Coloran
• Kimos (Kima)
• Labasan
• Lagting
• Laih
• Logpond
• Magsaysay
• Mahayahay
• Maligaya
• Maniha
• Minsulao
• Mirangan
• Monching
• Paruk
• Poblacion
• Princesa Sumama
• Salinding
• San Isidro
• Sibuguey
• Siloh
• Villagracia

Climate

Climate data for Siay, Zamboanga Sibugay
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Mean daily maximum °C (°F)	31 (88)	31 (88)	32 (90)	31 (88)	30 (86)	29 (84)	29 (84)	29 (84)	29 (84)	29 (84)	30 (86)	30 (86)	30 (86)
Mean daily minimum °C (°F)	23 (73)	23 (73)	24 (75)	25 (77)	25 (77)	25 (77)	24 (75)	24 (75)	24 (75)	24 (75)	24 (75)	23 (73)	24 (75)
Average precipitation mm (inches)	61 (2.4)	55 (2.2)	75 (3.0)	81 (3.2)	145 (5.7)	189 (7.4)	189 (7.4)	197 (7.8)	162 (6.4)	181 (7.1)	115 (4.5)	70 (2.8)	1,520 (59.9)
Average rainy days	16.4	15.7	19.1	21.5	26.9	27.1	26.4	25.0	24.2	26.8	23.5	18.7	271.3
Source: Meteoblue[9]

Demographics

Population census of Siay

Year	Pop.	±% p.a.
1960	14,088	—
1970	32,922	+8.85%
1975	37,816	+2.82%
1980	17,004	−14.77%
1990	24,689	+3.80%
1995	29,303	+3.26%
2000	32,844	+2.48%
2007	33,902	+0.44%
2010	38,229	+4.47%
2015	41,572	+1.61%
2020	40,585	−0.50%
2024	43,233	+1.53%
Source: Philippine Statistics Authority[10][11][12][13][14]

Economy

Poverty incidence of Siay

10 20 30 40 50 60 2000 58.34 2003 38.61 2006 42.60 2009 48.26 2012 37.76 2015 46.19 2018 33.02 2021 31.52 Source: Philippine Statistics Authority[15][16][17][18][19][20][21][22]

Environment

Siay is the location of the Kabug Mangrove Park and Wetlands.^[23]