Irosin, Province of Sorsogon

Summary data
Typemunicipality
Island groupLuzon
RegionBicol Region (Region V)
ProvinceSorsogon
Barangay count28
Postal code4707
Coastal/Landlockedlandlocked
Marine waterbodiesnone (landlocked)
Philippine major island(s)Luzon
Area (2007)149.87 km2 (57.87 sq mi)
Population (2015)56,662
Density (2015)378 / km2 (979 / sq mi)
Coordinates12° 42' North, 124° 2' East (12.7023, 124.0341)
Estimated elevation above sea level45.3 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 2015 Census was 56,662. This represented 7.15% of the total population of Sorsogon province, or 0.98% of the overall population of the Bicol Region. Based on these figures, the population density is computed at 378 inhabitants per square kilometer or 979 inhabitants per square mile.

Barangays

Irosin has 28 barangays as shown in the following table.

Demographic profile of barangays
BarangayPopulation percentage (2015)Population (2015)Population (2010)Change (2010‑2015)Annual Population Growth Rate (2010‑2015)
Bacolod7.97%4,5184,1668.45%1.56%
Bagsangan5.23%2,9612,62912.63%2.29%
Batang3.94%2,2312,1782.43%0.46%
Bolos1.56%8828108.89%1.63%
Buenavista2.33%1,3201,2446.11%1.14%
Bulawan2.03%1,1491,03710.80%1.97%
Carriedo5.64%3,1972,77715.12%2.72%
Casini2.04%1,1551,1163.49%0.66%
Cawayan0.76%428463-7.56%-1.49%
Cogon2.05%1,1641,02014.12%2.55%
Gabao7.56%4,2863,65017.42%3.11%
Gulang‑Gulang5.23%2,9652,7936.16%1.14%
Gumapia1.27%71964810.96%2.00%
Liang1.66%94381715.42%2.77%
Macawayan5.07%2,8732,59310.80%1.97%
Mapaso1.52%86072818.13%3.22%
Monbon7.79%4,4143,95311.66%2.12%
Patag5.53%3,1362,8549.88%1.81%
Salvacion2.52%1,4271,19919.02%3.37%
San Agustin3.75%2,1251,9449.31%1.71%
San Isidro1.27%72064910.94%2.00%
San Juan3.81%2,1612,0405.93%1.10%
San Julian4.29%2,4312,3772.27%0.43%
San Pedro5.57%3,1543,0214.40%0.82%
Santo Domingo1.68%950974-2.46%-0.47%
Tabon‑Tabon2.87%1,6281,40515.87%2.84%
Tinampo2.63%1,4891,32712.21%2.22%
Tongdol2.43%1,3761,3650.81%0.15%
Irosin Total56,66251,7779.43%1.73%

Economy

According to the Bureau of Local Government Finance, the annual regular revenue of Irosin for the fiscal year of 2016 was 123,860,278.73.

details
Fiscal YearAnnual Regular IncomeChange
200968,329,396.96
201077,687,877.9013.70%
201180,264,753.033.32%
201279,351,814.48-1.14%
201388,186,769.1111.13%
201499,190,771.8312.48%
2015111,812,152.1612.72%
2016123,860,278.7310.78%

End notes:

  • Annual Regular Income = Locally Sourced Revenue + Internal Revenue Allotment (IRA) Current Year + Other Shares from National Tax Collection
  • Locally Sourced Revenue = Real Property Tax (General Fund) + Tax on Business + Other Taxes + Regulatory Fees + Service/User Charges + Receipts from Economic Enterprises

Demographics

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 groupPopulation (2015)
Under 11,363
1 to 45,498
5 to 96,699
10 to 146,908
15 to 196,387
20 to 244,888
25 to 293,775
30 to 343,344
35 to 393,306
40 to 443,027
45 to 492,762
50 to 542,265
55 to 591,934
60 to 641,506
65 to 691,115
70 to 74824
75 to 79557
80 and over504
Total56,662

Historical population

The population of Irosin grew from 23,134 in 1960 to 56,662 in 2015, an increase of 33,528 people. The latest census figures in 2015 denote a positive growth rate of 1.73%, or an increase of 4,885 people, from the previous population of 51,777 in 2010.

details
Census datePopulationGrowth rate
23,134
27,9531.87%
30,9892.09%
34,9782.45%
37,8870.80%
41,0051.49%
45,5072.26%
49,9681.30%
51,7771.30%
56,6621.73%

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, Legazpi, Masbate City, Tabaco, Ligao, and Calbayog. The nearest municipalities are Santa Magdalena, Bulusan, Matnog, Juban, Bulan, and Casiguran. 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

Nearest cities

Distance from Manila: 390.94 kilometers (242.92 miles) to the West‑Northwest (N57°W)

National rankings

  • Population (2015): 56,662, ranked 385 out of 1,634
  • Land area (2007): 57.87 square kilometers, ranked 700 out of 1,634
  • Population density (2015): 378 inhabitants per square kilometer, ranked 494 out of 1,634
  • Annual population growth rate (2010 to 2015): 1.73%, ranked 1,564 out of 1,634

Notes

  1. Unless otherwise specified, population count (excluding percentages) and land area figures are derived from the Philippine Statistics Authority.
  2. Data on annual regular income is from the Bureau of Local Government Finance, Department of Finance
  3. Postal code information is from the Philippine Postal Corporation.
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