Irosin, Province of Sorsogon
| Type | municipality |
|---|---|
| Island group | Luzon |
| Region | Bicol Region (Region V) |
| Province | Sorsogon |
| Barangay count | 28 |
| Postal code | 4707 |
| Coastal/Landlocked | landlocked |
| Marine waterbodies | none (landlocked) |
| Philippine major island(s) | Luzon |
| Area (2013) | 149.87 km2 (57.87 sq mi) |
| Population (2020) | 59,267 |
| Density (2020) | 395 / km2 (1,024 / sq mi) |
| Coordinates | 12° 42' North, 124° 2' East (12.7023, 124.0341) |
| Estimated elevation above sea level | 45.3 meters (148.5 feet) |
Irosin is a landlocked municipality in the coastal province of Sorsogon.
The municipality has a land area of 149.87 square kilometers or 57.87 square miles which constitutes 7.07% of Sorsogon's total area. Its population as determined by the 2020 Census was 59,267. This represented 7.15% of the total population of Sorsogon province, or 0.97% of the overall population of the Bicol Region. Based on these figures, the population density is computed at 395 inhabitants per square kilometer or 1,024 inhabitants per square mile.
Barangays
Irosin has 28 barangays as shown in the following table.
Demographic profile of barangays
| Barangay | Population percentage (2020) | Population (2020) | Population (2015) | Change (2015‑2020) | Annual Population Growth Rate (2015‑2020) |
|---|---|---|---|---|---|
| Bacolod | 7.84% | 4,645 | 4,518 | 2.81% | 0.59% |
| Bagsangan | 5.15% | 3,054 | 2,961 | 3.14% | 0.65% |
| Batang | 3.85% | 2,281 | 2,231 | 2.24% | 0.47% |
| Bolos | 1.78% | 1,053 | 882 | 19.39% | 3.80% |
| Buenavista | 2.47% | 1,461 | 1,320 | 10.68% | 2.16% |
| Bulawan | 2.03% | 1,203 | 1,149 | 4.70% | 0.97% |
| Carriedo | 6.20% | 3,675 | 3,197 | 14.95% | 2.98% |
| Casini | 1.87% | 1,106 | 1,155 | -4.24% | -0.91% |
| Cawayan | 0.78% | 465 | 428 | 8.64% | 1.76% |
| Cogon | 1.88% | 1,117 | 1,164 | -4.04% | -0.86% |
| Gabao | 7.59% | 4,499 | 4,286 | 4.97% | 1.03% |
| Gulang-Gulang | 5.85% | 3,468 | 2,965 | 16.96% | 3.35% |
| Gumapia | 1.14% | 673 | 719 | -6.40% | -1.38% |
| Liang | 1.56% | 924 | 943 | -2.01% | -0.43% |
| Macawayan | 5.38% | 3,187 | 2,873 | 10.93% | 2.21% |
| Mapaso | 1.28% | 759 | 860 | -11.74% | -2.60% |
| Monbon | 7.24% | 4,293 | 4,414 | -2.74% | -0.58% |
| Patag | 5.72% | 3,392 | 3,136 | 8.16% | 1.67% |
| Salvacion | 2.72% | 1,611 | 1,427 | 12.89% | 2.59% |
| San Agustin | 3.94% | 2,334 | 2,125 | 9.84% | 1.99% |
| San Isidro | 1.30% | 770 | 720 | 6.94% | 1.42% |
| San Juan | 3.54% | 2,101 | 2,161 | -2.78% | -0.59% |
| San Julian | 3.84% | 2,273 | 2,431 | -6.50% | -1.40% |
| San Pedro | 5.51% | 3,267 | 3,154 | 3.58% | 0.74% |
| Santo Domingo | 1.90% | 1,124 | 950 | 18.32% | 3.60% |
| Tabon-Tabon | 2.74% | 1,623 | 1,628 | -0.31% | -0.06% |
| Tinampo | 2.62% | 1,555 | 1,489 | 4.43% | 0.92% |
| Tongdol | 2.28% | 1,354 | 1,376 | -1.60% | -0.34% |
| Irosin Total | 59,267 | 56,662 | 4.60% | 0.95% | |
Economy
The annual regular revenue of Irosin for the fiscal year of 2016 was ₱123,860,278.73.
details
| Fiscal Year | Annual Regular Income | Change |
|---|---|---|
| 2009 | 68,329,396.96 | – |
| 2010 | 77,687,877.90 | 13.70% |
| 2011 | 80,264,753.03 | 3.32% |
| 2012 | 79,351,814.48 | -1.14% |
| 2013 | 88,186,769.11 | 11.13% |
| 2014 | 99,190,771.83 | 12.48% |
| 2015 | 111,812,152.16 | 12.72% |
| 2016 | 123,860,278.73 | 10.78% |
End notes:
| ||
Demographics
Households
The household population of Irosin in the 2015 Census was 56,615 broken down into 11,418 households or an average of 4.96 members per household.
details
| Census date | Household population | Number of households | Average household size |
|---|---|---|---|
| 37,853 | 6,758 | 5.60 | |
| 40,976 | 7,763 | 5.28 | |
| 45,400 | 8,639 | 5.26 | |
| 49,929 | 9,913 | 5.04 | |
| 51,754 | 10,447 | 4.95 | |
| 56,615 | 11,418 | 4.96 |
Population by age group
According to the 2015 Census, the age group with the highest population in Irosin is 10 to 14, with 6,908 individuals. Conversely, the age group with the lowest population is 80 and over, with 504 individuals.
details
| Age group | Population (2015) | Age group percentage |
|---|---|---|
| Under 1 | 1,363 | 2.41% |
| 1 to 4 | 5,498 | 9.70% |
| 5 to 9 | 6,699 | 11.82% |
| 10 to 14 | 6,908 | 12.19% |
| 15 to 19 | 6,387 | 11.27% |
| 20 to 24 | 4,888 | 8.63% |
| 25 to 29 | 3,775 | 6.66% |
| 30 to 34 | 3,344 | 5.90% |
| 35 to 39 | 3,306 | 5.83% |
| 40 to 44 | 3,027 | 5.34% |
| 45 to 49 | 2,762 | 4.87% |
| 50 to 54 | 2,265 | 4.00% |
| 55 to 59 | 1,934 | 3.41% |
| 60 to 64 | 1,506 | 2.66% |
| 65 to 69 | 1,115 | 1.97% |
| 70 to 74 | 824 | 1.45% |
| 75 to 79 | 557 | 0.98% |
| 80 and over | 504 | 0.89% |
| Total | 56,662 | 100.00% |
| ||
Historical population
The population of Irosin grew from 8,644 in 1903 to 59,267 in 2020, an increase of 50,623 people over the course of 117 years. The latest census figures in 2020 denote a positive growth rate of 0.95%, or an increase of 2,605 people, from the previous population of 56,662 in 2015.
details
| Census date | Population | Growth rate |
|---|---|---|
| 8,644 | – | |
| 14,775 | 3.44% | |
| 17,017 | 0.71% | |
| 19,317 | 1.31% | |
| 23,134 | 1.60% | |
| 27,953 | 1.87% | |
| 30,989 | 2.09% | |
| 34,978 | 2.45% | |
| 37,887 | 0.80% | |
| 41,005 | 1.49% | |
| 45,507 | 2.26% | |
| 49,968 | 1.30% | |
| 51,777 | 1.30% | |
| 56,662 | 1.73% | |
| 59,267 | 0.95% |
The total number of registered voters or electorate in Irosin for the year 2019 was 36,479, broken down into 17,722 males and 18,757 females.
Location
The municipal center of Irosin is situated at approximately 12° 42' North, 124° 2' East, in the island of Luzon. Elevation at these coordinates is estimated at 45.3 meters or 148.5 feet above mean sea level.
Distances
Based on the great-circle distance (the shortest distance between two points over the surface of the Earth), the cities closest to Irosin are Sorsogon City, Sorsogon, Legazpi, Albay, Masbate City, Masbate, Tabaco, Albay, Ligao, Albay, and Calbayog, Samar. The nearest municipalities are Santa Magdalena, Sorsogon, Bulusan, Sorsogon, Matnog, Sorsogon, Juban, Sorsogon, Bulan, Sorsogon, and Casiguran, Sorsogon. Its distance from the national capital is 390.94 kilometers (242.92 miles). The following list delineates such distance measurements.
great-circle distance
Nearest towns
- Santa Magdalena, Sorsogon, 10.05 kilometers (6.25 miles) to the Southeast (S52°E)
- Bulusan, Sorsogon, 12.45 kilometers (7.74 miles) to the East‑Northeast (N64°E)
- Matnog, Sorsogon, 14.08 kilometers (8.75 miles) to the South‑Southeast (S23°E)
- Juban, Sorsogon, 16.79 kilometers (10.43 miles) to the North‑Northwest (N17°W)
- Bulan, Sorsogon, 17.44 kilometers (10.83 miles) to the West‑Southwest (S77°W)
- Casiguran, Sorsogon, 19.06 kilometers (11.84 miles) to the North (N9°W)
Nearest cities
- Sorsogon City, Sorsogon, 29.86 kilometers (18.55 miles) to the North (N6°W)
- Legazpi, Albay, 58.23 kilometers (36.18 miles) to the Northwest (N34°W)
- Masbate City, Masbate, 58.15 kilometers (36.13 miles) to the Southwest (S50°W)
- Tabaco, Albay, 79.82 kilometers (49.60 miles) to the North‑Northwest (N24°W)
- Ligao, Albay, 80.36 kilometers (49.94 miles) to the Northwest (N42°W)
- Calbayog, Samar, 93.04 kilometers (57.81 miles) to the Southeast (S41°E)
Distance from Manila: 390.94 kilometers (242.92 miles) to the West‑Northwest (N57°W)
Notes
- Unless otherwise specified, population count (excluding percentages), household data, and land area figures are derived from the Philippine Statistics Authority.
- Data on registered voters is from the Commission on Elections.
- Data on annual regular income is from the Bureau of Local Government Finance, Department of Finance
- Postal code information is from the Philippine Postal Corporation.