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Municipality

Irosin

Irosin is a municipality in Sorsogon, Bicol Region, Philippines. Its population was 59,540 in the 2024 census, and it has 28 barangays.

  • Population: 2024 Census
  • Places: PSGC 2Q 2026
  • Checked by Scene: October 8, 2026
  • Page updated: October 9, 2026
Colour byColours the map of Irosin by the figure chosen; the key beside it says what each colour means.
BulanBulusanJubanMatnogSanta MagdalenaBagsangan: 3,040 people, 346 per km², −0.11% a yearBacolod: 4,207 people, 18,698 per km², −2.35% a yearBatang: 2,325 people, 618 per km², 0.46% a yearBolos: 1,032 people, 430 per km², −0.48% a yearBuenavista: 1,439 people, 508 per km², −0.36% a yearBulawan: 1,252 people, 489 per km², 0.96% a yearCarriedo: 4,549 people, 966 per km², 5.25% a yearCasini: 1,102 people, 128 per km², −0.09% a yearCawayan: 429 people, 21 per km², −1.91% a yearCogon: 1,102 people, 59 per km², −0.32% a yearGabao: 4,587 people, 1,638 per km², 0.47% a yearGulang-Gulang: 3,283 people, 784 per km², −1.31% a yearGumapia: 731 people, 156 per km², 2.00% a yearSanto Domingo: 1,234 people, 667 per km², 2.26% a yearLiang: 902 people, 127 per km², −0.58% a yearMacawayan: 3,142 people, 1,001 per km², −0.34% a yearMapaso: 785 people, 99 per km², 0.81% a yearMonbon: 4,190 people, 825 per km², −0.58% a yearPatag: 3,453 people, 578 per km², 0.43% a yearSalvacion: 1,873 people, 341 per km², 3.68% a yearSan Agustin: 2,221 people, 3,896 per km², −1.18% a yearSan Isidro: 731 people, 233 per km², −1.24% a yearSan Juan: 1,623 people, 3,846 per km², −6.00% a yearSan Julian: 1,908 people, 5,747 per km², −4.11% a yearSan Pedro: 3,369 people, 1,643 per km², 0.74% a yearTabon-Tabon: 2,107 people, 1,848 per km², 6.46% a yearTinampo: 1,575 people, 581 per km², 0.31% a yearTongdol: 1,349 people, 331 per km², −0.09% 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

    59,540

    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 15% from 2010 to 2024

  • Rank by peopleSources

    6th

    of the 15 cities and municipalities of Sorsogon 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 Sorsogon lived in Irosin in 2024 (7.05%)

  • Inside itSources

    28

    barangays

  • LandSources

    151.68 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: Irosin's land would fill a square about 12.3 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: 393 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 4 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

    14,522

    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

    17.1%

    About 17 of every 100 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
0506209000[4]Formerly 056209000
ZIP code
4707[14, 15, 16]

People

Irosin had 59,540 people in the 2024 census, up 15% 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.

Irosin had the 6th most people of the 15 cities and municipalities of Sorsogon in 2024[1]
  1. 3Pilar76,908
  2. 4Castilla61,308
  3. 5Gubat61,095
  4. 6Irosin59,540
  5. 7Donsol51,781
  6. 8Matnog42,444
  7. 9Magallanes38,072
All 15 cities and municipalities of Sorsogon
In 2024, the 10 barangays with the most people held about 61 of every 100 of its people[2]
  1. Gabao4,5878 in 100
  2. Carriedo4,5498 in 100
  3. Bacolod4,2077 in 100
  4. Monbon4,1907 in 100
  5. Patag3,4536 in 100
  6. San Pedro3,3696 in 100
  7. Gulang-Gulang3,2836 in 100
  8. Macawayan3,1425 in 100
  9. Bagsangan3,0405 in 100
  10. Batang2,3254 in 100
See all 28 barangays of Irosin
Age structure · 2020 Census[36]People living in households, by age and sex
  • About 35 of every 100 are children under 15 (34.6%)
  • About 60 of every 100 are of working age, 15 to 64 (59.6%)
  • About 6 of every 100 are 65 or older (5.9%)
MenWomen

The figures by age

People by age group, men and women
AgePeopleMenWomen
0 - 47,0543,6613,393
5 - 96,9343,6403,294
10 - 146,4613,4013,060
15 - 196,4313,2913,140
20 - 245,3492,7552,594
25 - 294,2692,1642,105
30 - 343,6071,8171,790
35 - 393,1501,6031,547
40 - 443,1011,5711,530
45 - 492,8731,4621,411
50 - 542,5641,3251,239
55 - 592,0981,0291,069
60 - 641,809891918
65 - 691,328611717
70 - 74938377561
75 - 79633221412
80 years and over581165416

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
59,540[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
14,522[1, 2]
People in each household, 2024
4.1 on average[1, 2]
Share of Sorsogon, 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
7.05%[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
17.1% (10,183 people)[5]
Men and women, 2020
29,984 men, 29,196 women[36]People living in households
Population at each census, with its source
CensusPopulationGrowth since the census beforeHouseholdsPeople per household
2024as of July 1, 202459,540[1, 2]0.11% a year14,5224.1
2020as of May 1, 202059,267[1]0.95% a year——
2015as of August 1, 201556,662[1]1.73% a year——
2010as of May 1, 201051,777[1]———
2007as of August 1, 2007; as it was then49,968[34]1.30% a year——
2000as of May 1, 2000; on today’s borders45,507[34, 35]2.26% a year——
1995as of September 1, 1995; as it was then41,005[34]1.49% a year——
1990as of May 1, 1990; as it was then37,887[34]0.80% a year——
1980as of May 1, 1980; as it was then34,978[34]2.45% a year——
1975as of May 1, 1975; as it was then30,989[34]2.09% a year——
1970as of May 6, 1970; as it was then27,953[34]1.87% a year——
1960as of February 15, 1960; as it was then23,134[34]———

Barangays

Irosin is made up of 28 barangays.
Barangays of Irosin. Each column heading sorts the table.
[2, 3, 5, 6, 7]Share (2024)Urban or rural
Bacolod4,2077.07%−2.35% a yearabout 0.225 km²Rural
Bagsangan3,0405.11%−0.11% a yearabout 8.79 km²Rural
Batang2,3253.9%0.46% a yearabout 3.76 km²Rural
Bolos1,0321.73%−0.48% a yearabout 2.40 km²Rural
Buenavista1,4392.42%−0.36% a yearabout 2.83 km²Rural
Bulawan1,2522.1%0.96% a yearabout 2.56 km²Rural
Carriedo4,5497.64%5.25% a yearabout 4.71 km²Rural
Casini1,1021.85%−0.09% a yearabout 8.59 km²Rural
Cawayan4290.72%−1.91% a yearabout 19.96 km²Rural
Cogon1,1021.85%−0.32% a yearabout 18.68 km²Rural
Gabao4,5877.7%0.47% a yearabout 2.80 km²Rural
Gulang-Gulang3,2835.51%−1.31% a yearabout 4.19 km²Urban
Gumapia7311.23%2.00% a yearabout 4.70 km²Rural
Liang9021.51%−0.58% a yearabout 7.10 km²Rural
Macawayan3,1425.28%−0.34% a yearabout 3.14 km²Rural
Mapaso7851.32%0.81% a yearabout 7.92 km²Rural
Monbon4,1907.04%−0.58% a yearabout 5.08 km²Rural
Patag3,4535.8%0.43% a yearabout 5.97 km²Rural
Salvacion1,8733.15%3.68% a yearabout 5.49 km²Rural
San Agustin2,2213.73%−1.18% a yearabout 0.57 km²Rural
San Isidro7311.23%−1.24% a yearabout 3.14 km²Rural
San Juan1,6232.73%−6.00% a yearabout 0.422 km²Urban
San Julian1,9083.2%−4.11% a yearabout 0.332 km²Urban
San Pedro3,3695.66%0.74% a yearabout 2.05 km²Urban
Santo Domingo1,2342.07%2.26% a yearabout 1.85 km²Rural
Tabon-Tabon2,1073.54%6.46% a yearabout 1.14 km²Rural
Tinampo1,5752.65%0.31% a yearabout 2.71 km²Rural
Tongdol1,3492.27%−0.09% a yearabout 4.08 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

Irosin covers 151.68 km² of land, 393 people for every km² in 2024. Its land rises to 1,523 m above the sea and it lies inland.
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
151.68 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
393 people per km²[6]
Coordinates
12.71305° N, 124.02878° E[3]The point inside its border farthest from every edge, so it always falls within the place.
Height above the sea[30]
Lowest
16 m
Average
225 m
Highest
1,523 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

No coastline: it lies inland.

Rivers[31]

  1. Cadacan River15.1 of 21.1 km
  2. Cadacan River3.4 km

Peaks[31]

  1. Mount Jormajamvolcano710 m
  2. Mount Maraut-Banuavolcano620 m

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 II[32]

No dry season. The rain is heaviest from December to February, and no month is truly dry.

Read by Scene off PAGASA's climate map, so approximate: the type that covers most of the place's land.

At Masbate, the nearest PAGASA station, 58 km away[33]Averages for 1991 to 2020: 2,027 mm of rain on 146 days a year; 28.4 °C on average

Rain each month Average temperature

The figures by month

Climate at Masbate, 1991 to 2020, by month
MonthRainRainy daysAverageHighLow
January195 mm1426.9 °C30.4 °C23.4 °C
February114 mm1027.2 °C31.0 °C23.4 °C
March111 mm828.0 °C32.0 °C24.0 °C
April50 mm529.1 °C33.2 °C24.9 °C
May127 mm829.7 °C33.7 °C25.7 °C
June145 mm1129.4 °C33.3 °C25.5 °C
July209 mm1528.8 °C32.5 °C25.1 °C
August169 mm1428.8 °C32.5 °C25.1 °C
September205 mm1528.8 °C32.5 °C25.0 °C
October204 mm1428.6 °C32.4 °C24.9 °C
November205 mm1528.3 °C31.9 °C24.7 °C
December294 mm1727.5 °C30.9 °C24.1 °C
The year2,027 mm14628.4 °C32.2 °C24.7 °C

A station's figures describe the place around it only roughly: inland and in the hills it may be cooler and wetter. The station stands 9 m above the sea.

Life & Economy

About 26 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
26.4% of people[19]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 26 of every 100 people in Irosin lived below the poverty line in 2021 (26.4%)[19]

The PSA's model for every town puts it between 23.1% and 29.8%, with 90% confidence.

Public places

  • 4government offices
  • 3hospitals and health centres
  • 33schools
  • 5places of worship

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.

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

Government & Leaders

A mayor leads Irosin. 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.[12, 13]

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 Sorsogon[17, 18]

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
    Catalina Grace Hamor Yu[20]
    Vice mayor
    Alfredo Jao Cielo Jr.[20]

  2. 2022–2025

    Mayor
    Alfredo Jao Cielo Jr.[21]
    Vice mayor
    Christian Dig Lim[21]

  3. 2019–2022

    Mayor
    Alfredo Jao Cielo Jr.[22]
    Vice mayor
    Christian Dig Lim[22]

  4. 2016–2019

    Mayor
    Alfredo Jao Cielo Jr.[23]
    Vice mayor
    Christian Dig Lim[23]

  5. 2013–2016

    Mayor
    Eduardo Emor Ong Jr.[24]
    Vice mayor
    Alfredo Jao Cielo Jr.[24]

  6. 2010–2013

    Mayor
    Eduardo Emor Ong Jr.[25]
    Vice mayor
    Medardo Salgo Futalan Jr.[25]

  7. 2007–2010

    Mayor
    Ma. Lilia Bañares Gonzales[26]
    Vice mayor
    Jose Gonzales Michelena[26]

  8. 2004–2007

    Mayor
    Ma. Lilia Gonzales[27]
    Vice mayor
    Jose Michelena[27]

  9. 2001–2004

    Mayor
    Ma Lilia B. Gonzales[28]
    Vice mayor
    Jose G. Michelena[28]
Mayors and vice mayors of Irosin, by term
TermMayorVice mayor
2025–2028In office as of February 2026Catalina Grace Hamor Yu[20]Alfredo Jao Cielo Jr.[20]
2022–2025Alfredo Jao Cielo Jr.[21]Christian Dig Lim[21]
2019–2022Alfredo Jao Cielo Jr.[22]Christian Dig Lim[22]
2016–2019Alfredo Jao Cielo Jr.[23]Christian Dig Lim[23]
2013–2016Eduardo Emor Ong Jr.[24]Alfredo Jao Cielo Jr.[24]
2010–2013Eduardo Emor Ong Jr.[25]Medardo Salgo Futalan Jr.[25]
2007–2010Ma. Lilia Bañares Gonzales[26]Jose Gonzales Michelena[26]
2004–2007Ma. Lilia Gonzales[27]Jose Michelena[27]
2001–2004Ma Lilia B. Gonzales[28]Jose G. Michelena[28]

Before 2001

The heads of Irosin before COMELEC's lists begin, newest first, as the local government's own page lists them, with the office as that page writes it ("Not given" where it names no single office). "From" a year: the page gives only when the term began.

Heads of Irosin before 2001, newest first
YearsNameOffice
1964–1967Severino Fortes[29]Municipal Mayor
1913–1914Zacarias Conspecto[29]Not given

History & Identity

How it got its name

The town's history page says the first inhabitants of the eastern settlement, now barangay San Agustin, called the place Hin-ay; in about the 1840s it became a visita of Bulusan and, with St. Michael the Archangel as patron, was called Visita de San Miguel.[10]

Local traditionThe provincial page says the town was first known as Hinan-ay, a native word for how abaca fibre is arranged when woven, and that Irosin comes from the Bicol 'iros', to cut off or tear down, recalling landslides and erosion in the landlocked valley.[11]

Its story

A petition of 1876 from Calaay, Buenavista and San Miguel, then visitas, asked for a separate parish, and the Governor General approved it on 28 April 1877.[10]

On 3 November 1879 a decree of Governor General Moriones made them the pueblo civil of Yrocin.[10]

In 1888 the Catholic church was built on its present site, with a municipio and casa tribunal at the foot of the hill.[10]

In 1904 an American soldier, Charles Carter, started a primary school with local help, which became the Irosin Central School.[10]

Continuous rains on 24 December 1932 killed scores and eroded about eight hectares at Inulpacan; a typhoon on 26 April 1935 destroyed many buildings, including the church atop the hill.[10]

Irosin Junior High School, later Gallanosa National High School, opened on 6 July 1946.[10]

Timeline

  1. About the 1840s

    Hin-ay became a visita of Bulusan and was called Visita de San Miguel.[10]

  2. 28 April 1877

    Governor General's decree created the three visitas as a separate parish.[10]

  3. 3 November 1879

    Decree of Governor General Moriones created the pueblo civil of Yrocin.[10]

  4. 24 December 1932

    Continuous rains caused deaths and erosion at Inulpacan.[10]

  5. 6 July 1946

    Irosin Junior High School established.[10]

Nearby

Irosin shares a border with 5 places.

How it compares

Irosin beside Sorsogon, and where it stands among the cities and municipalities of Sorsogon.

Irosin beside Sorsogon
FigureIrosinSorsogonRank among the cities and municipalities of Sorsogon
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 glossary59,540[1, 2]845,0666th of 15
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 glossary0.11% a year[1, 2]slower0.47% a year15th of 15
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 glossary393[6]less crowded4246th of 15
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 glossary151.68 km²[6]1,993.11 km²5th of 15
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]higher4.0not 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 glossary17.1%[5]higher15.7%not ranked

How far, in a straight line[3]

Sorsogon City, the capital of Sorsogon
35.1 km north
Manila
389.0 km northwest

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

The nearest towns and cities[3]

  1. Santa MagdalenaSorsogon8.5 km southeast
  2. BulusanSorsogon9.6 km northeast
  3. BulanSorsogon12.2 km west
  4. JubanSorsogon13.3 km northwest
  5. MatnogSorsogon13.5 km south
  6. CasiguranSorsogon15.4 km north

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: Bicol Region (OpenSTAT table 0051A6DTPH4). Published August 4, 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.Municipality of Irosin, Sorsogon. Official website. Read by Scene October 3, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  10. 10.Municipality of Irosin. History of Irosin. Read by Scene October 3, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  11. 11.Provincial Government of Sorsogon. Attraction Map: municipality notes (Geography and History of each town). Read by Scene October 4, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  12. 12.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
  13. 13.1986 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
  14. 14.Philippine Postal Corporation (PHLPost). ZIP Code Locator. 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
  15. 15.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
  16. 16.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
  17. 17.1986 Constitutional Commission (text from the Chan Robles Virtual Law Library). Ordinance appended to the 1987 Constitution, apportioning the seats of the House of Representatives. 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
  18. 18.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
  19. 19.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
  20. 20.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
  21. 21.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
  22. 22.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
  23. 23.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
  24. 24.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
  25. 25.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
  26. 26.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
  27. 27.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
  28. 28.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
  29. 29.irosin.gov.ph. History - Municipality of Irosin. Read by Scene October 3, 2026. Philippine government work, no copyright (Republic Act No. 8293, Section 176.1). Open the source
  30. 30.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
  31. 31.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
  32. 32.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
  33. 33.Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), Climatology and Agrometeorology Division. Climatological Normals, 1991-2020, by synoptic station (one PDF each). Published January 2022. 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
  34. 34.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
  35. 35.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
  36. 36.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.

See something wrong on this page? Write to hello@scene.ph with the page address. We check every report against the source.

Cite this page

Scene.ph. “Irosin, Sorsogon.” Scene Atlas. Updated October 9, 2026. https://scene.ph/atlas/sorsogon/irosin