Irosin

Irosin
Municipality
Municipality of Irosin
Irosin Beacon with Mount Bulusan in the background
Irosin Beacon with Mount Bulusan in the background
Flag of Irosin
Flag
Map of Sorsogon with Irosin highlighted
Map of Sorsogon with Irosin highlighted
Interactive map of Irosin
Irosin is located in Philippines
Irosin
Irosin
Location within the Philippines
Coordinates: 12°42′18″N 124°01′55″E / 12.705°N 124.0319°E / 12.705; 124.0319
CountryPhilippines
RegionBicol Region
ProvinceSorsogon
District 2nd district
Barangays28 (see Barangays)
Government
 
 • TypeSangguniang Bayan
 • MayorGrace Hamor
 • Vice MayorAlfredo J. Cielo Jr.
 • RepresentativeManuel L. Fortes Jr.
 • Municipal Council
Members
  • Agustin E. Delmonte III
  • Virgilio M. Gabito
  • Irvin Karl S. Fortes
  • Reynaldo P. Lascano Jr.
  • Mercy Donna D. Balmes
  • Ansam J. Bringuela
  • Antonio G. Gajo
  • Jhumer B. Ong
 • Electorate41,494 voters (2025)
Area
 • Total
149.87 km2 (57.87 sq mi)
Elevation
168 m (551 ft)
Highest elevation
791 m (2,595 ft)
Lowest elevation
20 m (66 ft)
Population
 (2024 census)
 • Total
59,540
 • Density397.3/km2 (1,029/sq mi)
 • Households
12,753
Economy
 • Income class1st municipal income class
 • Poverty incidence
48.63
% (2000)
 • Revenue₱ 422.5 million (2024)
 • Assets₱ 864.6 million (2024)
 • Expenditure₱ 475 million (2024)
 • Liabilities₱ 436.4 million (2024)
Service provider
 • ElectricitySorsogon 1 Electric Cooperative (SORECO 1)
Time zoneUTC+8 (PST)
ZIP code
4707
PSGC
0506209000
IDD : area code +63 (0)56
Native languagesSorsogon language
Tagalog
Websitewww.irosin.gov.ph

Irosin, officially the Municipality of Irosin (Southern Sorsoganon: Bungto san Irosin; Waray: Bungto han Irosin, Tagalog: Bayan ng Irosin), is a municipality in the province of Sorsogon, Philippines. According to the 2024 census, it has a population of 59,540 people.

History

Irosin frequently experienced erosion due to river inundations. On December 24, 1933, massive flooding caused numerous fatalities. To prevent the violent surge of the river from eroding the town's mainland, a concrete river control dike was constructed in 1937 under Mayor Felipe Santiago and Congressman Norberto Roque.[better source needed]

Contemporary period

On April 10, 1989, Irosin was defended by military and police forces, led by Lieutenant Antonio Dy, against approximately 200 communist rebels of the New People's Army, which resulted in 20 rebel casualties; along with the deaths of three female civilians in the crossfire. Dy later received the "Medalya ng Kagitingan" Award in August for leading his 13 policemen to defend Irosin's municipal hall.

The local tourism industry has significant potential, as ecological tourism is a global trend and the national government aims to develop Bicol as a major tourist hub. Given its variety of natural tourist spots and strategic location, Irosin serves as a convergence area for both foreign and domestic tourists and visitors.

Climate data for Irosin, Sorsogon
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean daily maximum °C (°F) 27
(81)		 28
(82)		 29
(84)		 31
(88)		 31
(88)		 30
(86)		 29
(84)		 29
(84)		 29
(84)		 29
(84)		 29
(84)		 28
(82)		 29
(84)
Mean daily minimum °C (°F) 22
(72)		 21
(70)		 22
(72)		 23
(73)		 24
(75)		 25
(77)		 25
(77)		 25
(77)		 25
(77)		 24
(75)		 23
(73)		 23
(73)		 24
(74)
Average precipitation mm (inches) 65
(2.6)		 44
(1.7)		 42
(1.7)		 39
(1.5)		 87
(3.4)		 150
(5.9)		 184
(7.2)		 153
(6.0)		 163
(6.4)		 154
(6.1)		 127
(5.0)		 100
(3.9)		 1,308
(51.4)
Average rainy days 13.9 9.2 11.0 12.5 19.6 24.3 26.5 25.0 25.5 24.4 19.4 15.1 226.4
Source: Meteoblue (modeled/calculated data, not measured locally)

Political geography

Irosin is the only landlocked municipality in Sorsogon province.

Irosin is politically subdivided into 28 barangays, each consisting of puroks, and some with sitios.

  • Bagsangan
  • Bacolod (Poblacion)
  • Batang
  • Bolos
  • Buenavista
  • Bulawan
  • Carriedo
  • Casini
  • Cawayan
  • Cogon
  • Gabao
  • Gulang-Gulang
  • Gumapia
  • Santo Domingo (Lamboon)
  • Liang
  • Macawayan
  • Mapaso
  • Monbon
  • Patag
  • Salvacion
  • San Agustin (Poblacion)
  • San Isidro (Palogtok)
  • San Juan (Poblacion)
  • San Julian (Poblacion)
  • San Pedro (Poblacion)
  • Tabon-Tabon
  • Tinampo
  • Tongdol

Demographics

Population census of Irosin
YearPop.±% p.a.
1903 8,644—    
1918 14,775+3.64%
1939 17,017+0.68%
1948 19,317+1.42%
1960 23,134+1.51%
1970 27,953+1.91%
1975 30,989+2.09%
1980 34,978+2.45%
1990 37,887+0.80%
1995 41,005+1.49%
2000 45,507+2.26%
2007 49,968+1.30%
2010 51,777+1.30%
2015 56,662+1.73%
2020 59,267+0.95%
2024 59,540+0.11%
Source: Philippine Statistics Authority

Economy

Poverty incidence of Irosin (%)

10
20
30
40
50
2000
48.63
2003
44.69
2006
33.40
2009
34.18
2012
28.45
2015
37.34
2018
32.64
2021
26.41

Source: Philippine Statistics Authority

Education

The Iroson Schools District Office governs all educational institutions within the municipality. It oversees the management and operations of all private and public, from primary to secondary schools.

Primary and elementary schools

  • Bacolod Elementary School
  • Bagsangan Elementary School
  • Batang Elementary School
  • Benedicto F. Gabito Elementary School
  • BLISS Elementary School
  • Bolos Elementary School
  • Buenavista Elementary School
  • Bulawan Elementary School
  • Carriedo Elementary School
  • Casini Elementary School
  • Cawayan Elementary School
  • Cogon Elementary School
  • Gabao Elementary School
  • Gulang-Gulang Elementary School
  • Gumapia Elementary School
  • Holy Spirit Academy
  • Holy Trinity Community School
  • Irosin Central School
  • Liang Elementary School
  • Macawayan Elementary School
  • Mapaso Elementary School
  • Monbon Elementary School
  • Myrtle Christian Learning Center
  • Omagom Elementary School
  • Salvacion Elementary School
  • San Agustin Elementary School
  • San Isidro Elementary School
  • Severino E. Fortes Memorial School
  • Sorsogon Family and Teachers Learning Center
  • Sto. Domingo Elementary School
  • Tabon-Tabon Elementary School
  • Tinampo Elementary School
  • Tongdol Elementary School
  • Tulay Elementary School

Secondary schools

  • Gabao National High School
  • Gallanosa National High School
  • Irosin North National High School
  • Patag Integrated School

Technical and vocational school

  • Irosin Institute of Science and Technology

Higher educational institution

  • Veritas College of Irosin
  • Bonaventure Colleges of Sorsogon Inc.

References

  1. ↑  Municipality of Irosin | (DILG)
  2. ↑ "2015 Census of Population, Report No. 3 – Population, Land Area, and Population Density" (PDF). Philippine Statistics Authority. Quezon City, Philippines. August 2016. ISSN 0117-1453. Archived (PDF) from the original on May 25, 2021. Retrieved July 16, 2021.
  3. ↑ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
  4. ↑ "Estimation of Local Poverty in the Philippines" (PDF). Philippine Statistics Authority. 29 November 2005. Archived from the original (PDF) on 3 February 2021. Retrieved 4 August 2012. "2003 Small Area Estimates of Poverty (Full Report)" (PDF). Philippine Statistics Authority. 11 March 2009. Archived from the original (PDF) on 21 May 2025. Retrieved 4 August 2012. "2006 City and Municipal Level Poverty Estimates". Philippine Statistics Authority. 3 August 2012. Archived from the original on 21 May 2025. Retrieved 4 August 2012. "NSCB releases 2009 City and Municipal Level Poverty Estimate" (PDF). Philippine Statistics Authority. 3 August 2012. Archived from the original on 22 April 2021. Retrieved 4 August 2012. "PSA Releases the 2012 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 31 May 2016. Archived from the original on 21 September 2019. Retrieved 1 June 2016. "PSA Releases the 2015 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 10 July 2019. Archived from the original on 24 February 2020. Retrieved 11 July 2019. "PSA Releases the 2018 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 15 December 2021. Archived from the original on 15 January 2022. Retrieved 16 December 2021. "PSA Releases the 2021 City and Municipal Level Poverty Estimates". Philippine Statistics Authority. 2 April 2024. Archived from the original on 3 April 2024. Retrieved 3 April 2024.
  5. ↑ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
  6. ↑ Note: Brief historical account and poetic translation were drawn from the Irosin Town Fiesta '93 (September 20–29, 1993) Souvenir Magazine, "A toast to an alternative celebration!" - LG Ubalde
  7. ↑ Solminaro, F. (April 11, 1989). "31 slain in NPA encounters". Manila Standard. Kagitingan Publications, Inc. p. 7. Retrieved November 22, 2022.
  8. ↑ De Jesus, Sandra (August 3, 1989). "Satur captor heads PC day awardees". Manila Standard. Kagitingan Publications, Inc. p. 5. Retrieved November 22, 2022.
  9. ↑ "Irosin Tourism". Archived from the original on 2016-03-04. Retrieved 2016-01-11.
  10. ↑ "Irosin, Sorsogon : Average Temperatures and Rainfall". Meteoblue. Retrieved 29 December 2018.
  11. ↑ "2024 Census of Population (POPCEN) Population Counts Declared Official by the President". Philippine Statistics Authority. 17 July 2025. Retrieved 18 July 2025.
  12. ↑ Census of Population (2015). "Region V (Bicol Region)". Total Population by Province, City, Municipality and Barangay. Philippine Statistics Authority. Retrieved 20 June 2016.
  13. ↑ Census of Population and Housing (2010). "Region V (Bicol Region)" (PDF). Total Population by Province, City, Municipality and Barangay. National Statistics Office. Retrieved 29 June 2016.
  14. ↑ Censuses of Population (1903–2007). "Region V (Bicol Region)". Table 1. Population Enumerated in Various Censuses by Province/Highly Urbanized City: 1903 to 2007. National Statistics Office.
  15. ↑ "Province of". Municipality Population Data. Local Water Utilities Administration Research Division. Retrieved 17 December 2016.
  16. ↑ "Poverty incidence (PI):". Philippine Statistics Authority. Retrieved December 28, 2020.
  17. ↑ "Estimation of Local Poverty in the Philippines" (PDF). Philippine Statistics Authority. 29 November 2005. Archived from the original (PDF) on 3 February 2021. Retrieved 4 August 2012.
  18. ↑ "2003 Small Area Estimates of Poverty (Full Report)" (PDF). Philippine Statistics Authority. 11 March 2009. Archived from the original (PDF) on 21 May 2025. Retrieved 4 August 2012.
  19. ↑ "2006 City and Municipal Level Poverty Estimates". Philippine Statistics Authority. 3 August 2012. Archived from the original on 21 May 2025. Retrieved 4 August 2012.
  20. ↑ "PSA Releases the 2012 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 31 May 2016. Archived from the original on 21 September 2019. Retrieved 1 June 2016.
  21. ↑ "PSA Releases the 2015 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 10 July 2019. Archived from the original on 24 February 2020. Retrieved 11 July 2019.
  22. ↑ "PSA Releases the 2018 Municipal and City Level Poverty Estimates". Philippine Statistics Authority. 15 December 2021. Archived from the original on 15 January 2022. Retrieved 16 December 2021.
  23. ↑ "PSA Releases the 2021 City and Municipal Level Poverty Estimates". Philippine Statistics Authority. 2 April 2024. Archived from the original on 3 April 2024. Retrieved 3 April 2024.
  24. ↑ "Masterlist of Schools" (PDF). Department of Education. January 15, 2021. Retrieved November 14, 2025.
  25. ↑ Tec-Voc (2021-01-24). "Irosin Institute of Science and Technology". Tesda Courses. Retrieved 2025-01-29.