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Municipality

Siay

Siay is a municipality in Zamboanga Sibugay, Zamboanga Peninsula, Philippines. Its population was 43,233 in the 2024 census, and it has 29 barangays.

  • Population: 2024 Census
  • Places: PSGC 2Q 2026
  • Checked by Scene: October 8, 2026
  • Page updated: October 9, 2026
Colour byColours the map of Siay by the figure chosen; the key beside it says what each colour means.
DiplahanImeldaKabasalanPayaoBalucanan: 2,065 people, 473 per km², 3.17% a yearBalagon: 2,997 people, 118 per km², 1.66% a yearBalingasan: 759 people, 268 per km², 1.37% a yearBatu: 3,681 people, 445 per km², 0.07% a yearBuyogan: 1,264 people, 120 per km², 1.87% a yearCamanga: 1,069 people, 304 per km², 5.30% a yearColoran: 1,898 people, 246 per km², 0.81% a yearKimos: 1,230 people, 480 per km², −0.56% a yearLabasan: 1,030 people, 342 per km², 1.20% a yearLaih: 1,152 people, 116 per km², 2.79% a yearMagsaysay: 403 people, 29 per km², 3.58% a yearMahayahay: 820 people, 90 per km², −0.38% a yearMaligaya: 699 people, 90 per km², −5.96% a yearManiha: 1,054 people, 325 per km², 1.66% a yearMinsulao: 1,291 people, 140 per km², 3.44% a yearMirangan: 1,689 people, 282 per km², 1.94% a yearMonching: 4,373 people, 496 per km², 1.15% a yearParuk: 1,746 people, 319 per km², 3.99% a yearPoblacion: 2,545 people, 3,915 per km², 1.47% a yearPrincesa Sumama: 288 people, 28 per km², −1.83% a yearSibuguey: 1,083 people, 155 per km², 2.08% a yearBagong Silang: 646 people, 200 per km², 0.34% a yearBataan: 1,254 people, 461 per km², 2.40% a yearLagting: 772 people, 193 per km², 0.34% a yearLogpond: 2,551 people, 81 per km², 4.19% a yearSalinding: 2,061 people, 273 per km², 1.16% a yearSan Isidro: 573 people, 54 per km², −3.30% a yearSiloh: 1,801 people, 361 per km², 2.35% a yearVillagracia: 439 people, 79 per km², 1.53% a year

People · 2024 Census

  • Under 690
  • 690 to 1,100
  • 1,100 to 1,800
  • 1,800 to 3,100
  • 3,100 and over

The same steps colour every map of barangays in the Atlas, so a colour means the same range everywhere.

Density · people per km², 2024

  • Under 160
  • 160 to 340
  • 340 to 700
  • 700 to 2,600
  • 2,600 and over

The same steps colour every map of barangays in the Atlas, so a colour means the same range everywhere.

Growth a year · 2020–2024

  • Fell by more than 1% a year
  • Fell, by up to 1% a year
  • Grew, by under 1% a year
  • Grew by 1 to 2% a year
  • Grew by 2% a year or more

Each place's yearly change between the 2020 and 2024 censuses, on the same steps as every map in the Atlas.

Borders from UN OCHA (PSA and NAMRIA), a guide and not the legal boundary[3]Open in OpenStreetMap

  • PeopleSources

    43,233

    people counted in the 2024 censusCensusA count of every person in the country, all on one day. The 2024 census counted people as they were on 1 July 2024.More in the glossary

    Up 13.1% from 2010 to 2024

  • Rank by peopleSources

    6th

    of the 16 cities and municipalities of Zamboanga Sibugay by population, 2024Rank and shareWorked out by Scene from the PSA's counts: where a place stands among the places listed with it, and how many of every 100 of its parent's people live in it.More in the glossary

    About 7 of every 100 people in Zamboanga Sibugay lived in Siay in 2024 (6.54%)

  • Inside itSources

    29

    barangays

  • LandSources

    282.86 km²

    of land, 2019 masterlistLand areaThe land inside the place's official boundary. A square kilometre is a square 1 km on each side, about the size of 140 football fields.Explained by Scene: Siay's land would fill a square about 16.8 km on each side. That is only a way to picture its size: its real shape is on the map.More in the glossary

    Average density, 2024: 153 people per km²Population densityHow crowded a place is on average: its people divided by its land area. 1,000 people per square kilometre is 10 people per hectare, a square of 100 by 100 metres.Explained by Scene: About 2 people per hectare if everyone were spread evenly across the land. In fact people live closer together in towns and farther apart in the countryside.More in the glossary

  • HomesSources

    10,559

    households in 2024HouseholdA person living alone, or people who sleep in the same home and share their meals. A family may be one household or several.More in the glossary

    4.1 people in each, on average, in 2024

  • Town or countrySources

    0%

    Fewer than 1 of every 1,000 people lived in urban barangays in 2024Urban barangayThe PSA counts a barangay as urban when it has 5,000 people or more, or a big employer, or several businesses and public services close by. Every barangay in Metro Manila is urban.More in the glossary

PSGC codePSGC codeThe code the Philippine Statistics Authority gives every place, so each one is known exactly, even when two share a name.More in the glossary
0908313000[4]Formerly 098313000
ZIP code
7006[12, 13]

People

Siay had 43,233 people in the 2024 census, up 13.1% from 2010.
People at each census since 1960

Counts from 2000 on are on today’s borders; earlier counts are as the place was then, so the line may step where a border moved.

Siay had the 6th most people of the 16 cities and municipalities of Zamboanga Sibugay in 2024[1]
  1. 3Kabasalan48,366
  2. 4Tungawan48,013
  3. 5Roseller Lim44,735
  4. 6Siay43,233
  5. 7Naga42,270
  6. 8Alicia39,484
  7. 9Buug38,730
All 16 cities and municipalities of Zamboanga Sibugay
In 2024, the 10 barangays with the most people held about 59 of every 100 of its people[2]
  1. Monching4,37310 in 100
  2. Batu3,6819 in 100
  3. Balagon2,9977 in 100
  4. Logpond2,5516 in 100
  5. Poblacion2,5456 in 100
  6. Balucanan2,0655 in 100
  7. Salinding2,0615 in 100
  8. Coloran1,8984 in 100
  9. Siloh1,8014 in 100
  10. Paruk1,7464 in 100
See all 29 barangays of Siay
Age structure · 2020 Census[33]People living in households, by age and sex
  • About 35 of every 100 are children under 15 (34.8%)
  • About 60 of every 100 are of working age, 15 to 64 (60.4%)
  • About 5 of every 100 are 65 or older (4.8%)
MenWomen

The figures by age

People by age group, men and women
AgePeopleMenWomen
0 - 44,2532,2242,029
5 - 95,0182,6332,385
10 - 144,8382,5562,282
15 - 194,3052,2052,100
20 - 243,2771,6371,640
25 - 293,1981,6531,545
30 - 342,6281,3901,238
35 - 392,2251,1711,054
40 - 442,1771,1601,017
45 - 491,9831,021962
50 - 541,890995895
55 - 591,535807728
60 - 641,233637596
65 - 69840421419
70 - 74501233268
75 - 79308133175
80 years and over306117189

Every figure, census by census

People, 2024 CensusCensusA count of every person in the country, all on one day. The 2024 census counted people as they were on 1 July 2024.More in the glossary
43,233[1, 2]
Households, 2024HouseholdA person living alone, or people who sleep in the same home and share their meals. A family may be one household or several.More in the glossary
10,559[1, 2]
People in each household, 2024
4.1 on average[1, 2]
Share of Zamboanga Sibugay, 2024Rank and shareWorked out by Scene from the PSA's counts: where a place stands among the places listed with it, and how many of every 100 of its parent's people live in it.More in the glossary
6.54%[1]
In urban barangays, 2024Urban barangayThe PSA counts a barangay as urban when it has 5,000 people or more, or a big employer, or several businesses and public services close by. Every barangay in Metro Manila is urban.More in the glossary
0% (0 people)[5]
Men and women, 2020
20,993 men, 19,522 women[33]People living in households
Population at each census, with its source
CensusPopulationGrowth since the census beforeHouseholdsPeople per household
2024as of July 1, 202443,233[1, 2]1.53% a year10,5594.1
2020as of May 1, 202040,585[1]−0.50% a year——
2015as of August 1, 201541,572[1]1.61% a year——
2010as of May 1, 201038,229[1]———
2007as of August 1, 2007; as it was then33,902[30]0.44% a year——
2000as of May 1, 2000; on today’s borders32,844[30, 31]2.47% a year——
1995as of September 1, 1995; as it was then29,303[30]3.26% a year——
1990as of May 1, 1990; as it was then24,689[30]3.80% a year——
1980as of May 1, 1980; as it was then17,004[30]−14.76% a year——
1975as of May 1, 1975; as it was then37,816[30]2.82% a year——
1970as of May 6, 1970; as it was then32,922[30]8.65% a year——
1960as of February 15, 1960; as it was then14,088[30]———

Barangays

Siay is made up of 29 barangays.
Barangays of Siay. Each column heading sorts the table.
[2, 3, 5, 6, 7]Share (2024)Urban or rural
Bagong Silang6461.49%0.34% a yearabout 3.23 km²Rural
Balagon2,9976.93%1.66% a yearabout 25.42 km²Rural
Balingasan7591.76%1.37% a yearabout 2.83 km²Rural
Balucanan2,0654.78%3.17% a yearabout 4.37 km²Rural
Bataan1,2542.9%2.40% a yearabout 2.72 km²Rural
Batu3,6818.51%0.07% a yearabout 8.27 km²Rural
Buyogan1,2642.92%1.87% a yearabout 10.51 km²Rural
Camanga1,0692.47%5.30% a yearabout 3.52 km²Rural
Coloran1,8984.39%0.81% a yearabout 7.70 km²Rural
Kimos1,2302.85%−0.56% a yearabout 2.56 km²Rural
Labasan1,0302.38%1.20% a yearabout 3.01 km²Rural
Lagting7721.79%0.34% a yearabout 4.00 km²Rural
Laih1,1522.66%2.79% a yearabout 9.94 km²Rural
Logpond2,5515.9%4.19% a yearabout 31.36 km²Rural
Magsaysay4030.93%3.58% a yearabout 13.68 km²Rural
Mahayahay8201.9%−0.38% a yearabout 9.10 km²Rural
Maligaya6991.62%−5.96% a yearabout 7.73 km²Rural
Maniha1,0542.44%1.66% a yearabout 3.24 km²Rural
Minsulao1,2912.99%3.44% a yearabout 9.20 km²Rural
Mirangan1,6893.91%1.94% a yearabout 6.00 km²Rural
Monching4,37310.11%1.15% a yearabout 8.81 km²Rural
Paruk1,7464.04%3.99% a yearabout 5.48 km²Rural
Poblacion2,5455.89%1.47% a yearabout 0.65 km²Rural
Princesa Sumama2880.67%−1.83% a yearabout 10.40 km²Rural
Salinding2,0614.77%1.16% a yearabout 7.56 km²Rural
San Isidro5731.33%−3.30% a yearabout 10.69 km²Rural
Sibuguey1,0832.51%2.08% a yearabout 6.99 km²Rural
Siloh1,8014.17%2.35% a yearabout 4.99 km²Rural
Villagracia4391.02%1.53% a yearabout 5.55 km²Rural

Areas are approximate: each is measured inside the barangay's border on UN OCHA's map, which is a guide, not the legal boundary.

Land & Environment

Siay covers 282.86 km² of land, 153 people for every km² in 2024. Its land rises to 555 m above the sea and it has 20.2 km of coast.
Land areaLand areaThe land inside the place's official boundary. A square kilometre is a square 1 km on each side, about the size of 140 football fields.More in the glossary
282.86 km²[6]As listed in the 2019 Masterlist of Land Areas (LMB, DENR)
Average density, 2024Population densityHow crowded a place is on average: its people divided by its land area. 1,000 people per square kilometre is 10 people per hectare, a square of 100 by 100 metres.More in the glossary
153 people per km²[6]
Coordinates
7.75002° N, 122.88603° E[3]The point inside its border farthest from every edge, so it always falls within the place.
Height above the sea[27]
Lowest
Sea level
Average
86 m
Highest
555 m

Heights from the Copernicus DEM, a 30 m model of the surface: it reads the tops of trees and roofs, not the bare ground, over the land inside the border, the sea left out. Produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved.

Water, coast and peaks

20.2 km of coastline[28]

Rivers[28]

  1. Sibuguey River19.5 of 112.4 km
  2. Siay River12.8 of 13.3 km
  3. Siay River11.5 of 11.6 km
  4. Siay River9.7 km
  5. Sibuguey River3.3 of 6.6 km
  6. Siay River2.3 km

Peaks[28]

  1. Bagong Silangheight not mapped

Named rivers, lakes and peaks as OpenStreetMap mapped them on 30 September 2026, and the coast within 150 m of the border. Map data © OpenStreetMap contributors, under the Open Database License.

Climate

Climate typeClimate typePAGASA sorts the country's climate into four types by when the rain falls. Type I has a dry season from November to April and a wet one for the rest of the year; Type II has no dry season, with the most rain from December to February; Type III has a short dry season; Type IV has rain spread through the year.More in the glossary

Type IV[29]

Rain spread fairly evenly through the year, with no dry season.

Covers about 93 of every 100 parts of its land. Read by Scene off PAGASA's climate map, so approximate: the type that covers most of the place's land.

Life & Economy

About 32 of every 100 people lived below the poverty line in 2021.
Poverty, 2021Poverty incidenceHow many of every 100 people live in families whose income is below the poverty line: what a person needs in a year for food and other basic needs, as the PSA sets it for each province. It is an estimate, from a survey or, for a town, a statistical model, so the PSA gives a range it is likely to fall in.More in the glossary
31.5% of people[17]Below the poverty line, by the PSA's estimate for every town.
Income classIncome classThe Department of Finance sorts provinces, cities and municipalities into classes by their average yearly income over recent years: 1st class has the most. It measures the local government's income, not how well off its people are.More in the glossary
1st class[4]
About 32 of every 100 people in Siay lived below the poverty line in 2021 (31.5%)[17]

The PSA's model for every town puts it between 26.7% and 36.3%, with 90% confidence.

Public places

  • 16government offices
  • 5hospitals and health centres
  • 36schools
  • 4places of worship
  • 1station or terminal

Counted from OpenStreetMap[3, 8]. Schools, places of worship, barangay halls and places known only by a common name, such as a chapel, are listed on each barangay's page.

Where a kind has more than 8, this page shows 6: first those with “Siay” in their name, then one in each of its most populous barangays.

Government offices12

6 more government offices are listed on the pages of the barangays they stand in. See the 29 barangays of Siay

Hospitals and health centres5

Stations and terminals1

As OpenStreetMap maps them on September 30, 2026. Map data © OpenStreetMap contributors, under the Open Database License.

Government & Leaders

A mayor leads Siay. Its local laws, called ordinances, are passed by the Sangguniang Bayan (the municipal council), led by the vice mayor. The mayor, the vice mayor and the council's elected members serve three-year terms, and none may serve more than three in a row.[10, 11]

Legislative districtLegislative districtThe area that elects one member of the House of Representatives. A big province or city may have several.More in the glossary
2nd district of Zamboanga Sibugay[14, 15, 16]

Leaders

The mayor and vice mayor elected at each election since 2001, as COMELEC's lists of the elected name them, and those in office now, as the DILG's directory lists them.

  1. 2025–2028In office as of February 2026

    Mayor
    Julius Mandi Acosta Jr.[18]
    Vice mayor
    Gerald Mandi Acosta[18]

  2. 2022–2025

    Mayor
    Jarvis Mandi Acosta[19]
    Vice mayor
    Julius Mandi Acosta Jr.[19]

  3. 2019–2022

    Mayor
    Jarvis Mandi Acosta[20]
    Vice mayor
    Julius Mandi Acosta Jr.[20]

  4. 2016–2019

    Mayor
    Jarvis Mandi Acosta[21]
    Vice mayor
    Gerald Mandi Acosta[21]

  5. 2013–2016

    Mayor
    Julius Tadeja Acosta Sr.[22]
    Vice mayor
    Gerald Mandi Acosta[22]

  6. 2010–2013

    Mayor
    Julius Tadeja Acosta Sr.[23]
    Vice mayor
    Carlito Pagarigan Bayawa[23]

  7. 2007–2010

    Mayor
    Julius Tadeja Acosta[24]
    Vice mayor
    Valentin Bumatay Semella[24]

  8. 2004–2007

    Mayor
    Arthur Luspo[25]
    Vice mayor
    Valentin Semella[25]

  9. 2001–2004

    Mayor
    Arthur W. Luspo[26]
    Vice mayor
    Valentin B. Semella[26]
Mayors and vice mayors of Siay, by term
TermMayorVice mayor
2025–2028In office as of February 2026Julius Mandi Acosta Jr.[18]Gerald Mandi Acosta[18]
2022–2025Jarvis Mandi Acosta[19]Julius Mandi Acosta Jr.[19]
2019–2022Jarvis Mandi Acosta[20]Julius Mandi Acosta Jr.[20]
2016–2019Jarvis Mandi Acosta[21]Gerald Mandi Acosta[21]
2013–2016Julius Tadeja Acosta Sr.[22]Gerald Mandi Acosta[22]
2010–2013Julius Tadeja Acosta Sr.[23]Carlito Pagarigan Bayawa[23]
2007–2010Julius Tadeja Acosta[24]Valentin Bumatay Semella[24]
2004–2007Arthur Luspo[25]Valentin Semella[25]
2001–2004Arthur W. Luspo[26]Valentin B. Semella[26]

History & Identity

Created
Siay was created by Executive Order No. 223 of December 28, 1956 from 26 barrios and sitios of Kabasalan and six of Malangas, Zamboanga del Sur, with the seat at barrio Siay.[9]

Timeline

  1. 28 December 1956

    Executive Order No. 223 took effect only once the mayor, vice-mayor and a majority of councilors were appointed and the Secretary of Finance certified the new municipality could meet its obligations.[9]

Changes since 1977

As the Philippine Statistics Authority recorded them in its list of places.

  1. January to March 2001

    Moved from Zamboanga del Sur, by RA 8973.[32]

Nearby

Siay shares a border with Diplahan, Imelda, Kabasalan and Payao.

How it compares

Siay beside Zamboanga Sibugay, and where it stands among the cities and municipalities of Zamboanga Sibugay.

Siay beside Zamboanga Sibugay
FigureSiayZamboanga SibugayRank among the cities and municipalities of Zamboanga Sibugay
People, 2024CensusA count of every person in the country, all on one day. The 2024 census counted people as they were on 1 July 2024.More in the glossary43,233[1, 2]661,4986th of 16
Growth a year, 2020–2024Growth a yearHow fast the number of people changed each year between two censuses. 1% a year means about 1 more person for every 100 people, each year.More in the glossary1.53% a year[1, 2]faster−0.30% a year2nd of 16
People per km², 2024Population densityHow crowded a place is on average: its people divided by its land area. 1,000 people per square kilometre is 10 people per hectare, a square of 100 by 100 metres.More in the glossary153[6]less crowded21815th of 16
Land areaLand areaThe land inside the place's official boundary. A square kilometre is a square 1 km on each side, about the size of 140 football fields.More in the glossary282.86 km²[6]3,032.59 km²4th of 16
People in each household, 2024HouseholdA person living alone, or people who sleep in the same home and share their meals. A family may be one household or several.More in the glossary4.1[1, 2]lower4.2not ranked
In urban barangays, 2024Urban barangayThe PSA counts a barangay as urban when it has 5,000 people or more, or a big employer, or several businesses and public services close by. Every barangay in Metro Manila is urban.More in the glossary0%[5]lower25.1%not ranked

How far, in a straight line[3]

Ipil, the capital of Zamboanga Sibugay
39.0 km west
Manila
789.0 km north

In a straight line between the points inside each place farthest from its edges, not by road.

The nearest towns and cities[3]

  1. DiplahanZamboanga Sibugay11.3 km northeast
  2. ImeldaZamboanga Sibugay11.6 km southeast
  3. KabasalanZamboanga Sibugay15.5 km northwest
  4. BuugZamboanga Sibugay16.9 km east
  5. PayaoZamboanga Sibugay17.4 km south
  6. MalangasZamboanga Sibugay17.9 km southeast

Sources

Page updated October 9, 2026. Sources checked by Scene October 8, 2026.
  1. 1.Philippine Statistics Authority. Population and Annual Population Growth Rate of the Philippines and its Regions, Provinces, and Highly Urbanized Cities Based on the 2010, 2015, 2020 and 2024 Population Census (OpenSTAT table 0211A6DAPG0). Published August 7, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  2. 2.Philippine Statistics Authority. Total Population, Household Population, and Number of Households by Province, City, Municipality, and Barangay as of 01 July 2024: Zamboanga Peninsula (OpenSTAT table 0091A6DTPH8). Published August 5, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  3. 3.UN OCHA, from the PSA and NAMRIA. Philippines: Subnational Administrative Boundaries (COD-AB), barangay layer. Published February 13, 2025. Read by Scene September 25, 2026. CC BY-IGO 3.0. Open the source
  4. 4.Philippine Statistics Authority. Philippine Standard Geographic Code (PSGC), 2nd Quarter 2026: Publication Datafile. Published June 30, 2026. Read by Scene September 24, 2026. CC BY (PSA Terms of Use). Open the source
  5. 5.Philippine Statistics Authority. Total Population and Urban Population by Urban Classification and Region, Province, Highly Urbanized City, City/Municipality and Barangay: Philippines, 2024 (OpenSTAT table 0231A6DPUP0). Published August 7, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  6. 6.Philippine Statistics Authority, from the Land Management Bureau (DENR). Population, Land Area, Population Density, and Percent Change in Population Density by Region, Province/Highly Urbanized City, and City/Municipality: 2015, 2020, and 2024 (OpenSTAT table 0221A6DLPD0). Published August 7, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  7. 7.Philippine Statistics Authority. Philippine Standard Geographic Code (PSGC), 4th Quarter 2022: Publication Datafile, with the 2015 and 2020 census counts (the PSA's file, as the Internet Archive keeps it). Published December 31, 2022. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  8. 8.OpenStreetMap contributors. Named public places in OpenStreetMap: schools, hospitals and health centres, places of worship, government offices, markets, stations, parks, beaches and monuments, from Geofabrik's extract of the Philippines. Published September 30, 2026. Read by Scene October 2, 2026. ODbL 1.0. Open the source
  9. 9.The LawPhil Project - Arellano Law Foundation. Executive Order No. 223, s. 1956 (Creating the Municipality of Siay). Published December 28, 1956. Read by Scene October 3, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  10. 10.Congress of the Philippines. Republic Act No. 7160: the Local Government Code of 1991. Published October 10, 1991. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  11. 11.1986 Constitutional Commission. The 1987 Constitution of the Republic of the Philippines. Published February 2, 1987. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  12. 12.Philippine Postal Corporation (PHLPost). ZIP Code Locator, as the Internet Archive captured it on 2022-05-21 (its SHA-1 matches the Archive's index). Published May 21, 2022. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1; a government-owned corporation's work is the Government's, Section 171.9). Open the source
  13. 13.Philippine Postal Corporation (PHLPost). Philippine ZIP Codes (the directory "ZipCode 2019.pdf", made 2019-12-02), as the Internet Archive keeps it (its SHA-1 matches the Archive's index). Published December 2, 2019. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1; a government-owned corporation's work is the Government's, Section 171.9). Open the source
  14. 14.Congress of the Philippines. Republic Act No. 9360: An Act creating another congressional district in the Province of Zamboanga Sibugay, amending Republic Act No. 8973. Published October 26, 2006. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  15. 15.Congress of the Philippines. Republic Act No. 8973: An Act creating the Province of Zamboanga Sibugay from the Province of Zamboanga del Sur. Published November 7, 2000. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  16. 16.Commission on Elections (COMELEC). 2025 National and Local Elections: results, certificates of canvass of every province, city and municipality. Published May 2025. Read by Scene October 2, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  17. 17.Philippine Statistics Authority. Municipal and City Level Small Area Poverty Estimates; 2018 and 2021 (the PSA's workbook "2018 - 2021 SAE_with PSGC_noHUC.xlsx", sheet "2018-2021_NoHUC", as the Internet Archive keeps it). Published April 2, 2024. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  18. 18.Department of the Interior and Local Government (DILG). Directory of LGU Elective Officials for Term 2025-2028 as of February 2026 (its sheet: Consolidated List of Officials for Election Terms (2025-2028)), released through the FOI portal. Published February 2026. Read by Scene October 2, 2026. A work of the Government of the Philippines: RA 8293, Section 176 (no copyright subsists in it; exploiting it for profit needs the agency's prior approval). Open the source
  19. 19.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 9, 2022 National and Local Elections. Published December 23, 2025. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  20. 20.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 13, 2019 National and Local Elections. Published December 23, 2025. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  21. 21.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 9, 2016 National and Local Elections (its pages are headed "LIST OF ELECED CITY/MUNICIPAL CANDIDATES"). Published January 12, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  22. 22.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 13, 2013 National and Local Elections. Published January 12, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  23. 23.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 10, 2010 National and Local Elections. Published January 8, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  24. 24.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 14, 2007 National and Local Elections. Published January 14, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  25. 25.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 10, 2004 National and Local Elections (its pages are headed "LIST OF CITY/MUNICIPAL CANDIDATES"). Published January 14, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  26. 26.Commission on Elections (COMELEC), Records and Statistics Division, ERSD. List of Elected City/Municipal Candidates, May 14, 2001 National and Local Elections. Published January 8, 2026. Read by Scene October 2, 2026. Public domain: comelec.gov.ph says "All content is in the public domain unless otherwise stated." Each list carries COMELEC's data privacy notice (RA 10173).. Open the source
  27. 27.European Union and the European Space Agency (Copernicus), from DLR and Airbus Defence and Space (WorldDEM). Copernicus DEM GLO-30: global digital surface model at 30 m, one-degree tiles (2021 release). Published 2021. Read by Scene October 2, 2026. Copernicus DEM GLO-30 licence: free, any use including commercial, with the Copernicus notice. Open the source
  28. 28.OpenStreetMap contributors, extract by Geofabrik. Named rivers, lakes, reservoirs, peaks and the coastline of the Philippines in OpenStreetMap (Geofabrik extract, cut by osmium). Published September 30, 2026. Read by Scene October 2, 2026. ODbL 1.0. Open the source
  29. 29.Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), Climatology and Agrometeorology Division. Climate Map of the Philippines (1951-2010), Modified Coronas Climate Classification. Published August 2014. Read by Scene October 2, 2026. A work of the Government of the Philippines: no copyright (RA 8293 s.176.1); PAGASA's approval is needed to use it for profit. Open the source
  30. 30.Philippine Statistics Authority. 2015 Census of Population, Statistical Tables, Table 1: Population Enumerated in Various Censuses by City/Municipality, 1960-2015 (one workbook for each province, highly urbanized city and region). Published 2017. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  31. 31.Philippine Statistics Authority. 2020 Census of Population and Housing: Table A (Population and Annual Growth Rate for the Philippines and its Regions, Provinces and Highly Urbanized Cities) and Table B (Population and Annual Growth Rates by Province, City and Municipality, by Region). Published July 2021. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  32. 32.Philippine Statistics Authority. Philippine Standard Geographic Code (PSGC), 2nd Quarter 2026: Summary of Changes, every change to a place since 1977. Published June 30, 2026. Read by Scene October 2, 2026. CC BY (PSA Terms of Use). Open the source
  33. 33.Philippine Statistics Authority. 2020 Census of Population and Housing: Household Population by Age Group and Sex, for the Philippines and its regions, provinces, cities and municipalities (revised file, psa.gov.ph/system/files/phcd/2022-12/). Published December 2022. Read by Scene October 8, 2026. CC BY (PSA Terms of Use). Open the source

Scene adds what the sources do not print themselves: growth rates, shares, barangay areas and densities, coordinates, neighbours and distances, each computed from the figures and borders above. How each is made.

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Cite this page

Scene.ph. “Siay, Zamboanga Sibugay.” Scene Atlas. Updated October 9, 2026. https://scene.ph/atlas/zamboanga-sibugay/siay