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Population Composition

Irosin has a total population of 56,662 in 2015, comprising 7.1% of Sorsogon province total population. There are 11,820 documented households for the same year and the average household size is 4.64.  The population has grown by 4,885 persons from 2010 with an average annual growth rate of 1.72%. 

Irosin’s population is expansive. In 2010, the age group below one year to 14 years old comprises 38.6% of the total population. The productive population with ages ranging from 15 to 64 years old is 56.3% of the population while the proportion of senior citizens or 65 years old and above is 5.1% of the population. Male population is slightly higher than the female population in 2010 where there are 103.3 males for every 100 females. The local age-sex distribution follows a worldwide pattern in which males predominate at birth but the ratio gradually declines with increasing age presumably because males have higher age-specific mortality rates. Consequently, females tend to outnumber males as their age advances. For the age group 65 and above, the ratio is 66 males for every 100 females.

The total age dependency ratio in 2010, or the ratio of those who are too young (below 15 years old) and too old (65 years and above) to earn a living to the productive population (15 to 64 years old), is 74 dependents for every 100 productive individuals. The young dependency ratio is 69 young dependents for every 100 productive individuals while the elderly dependency ratio is 6 out of 100.

The number of labor force in the age group 15 years old and over is 61% of the population in 2010. Of the total labor force, there are 15,259 total gainful workers documented in 2010. The sex ratio of the employed population is 330 employed males for every 100 employed females.

The school-going population ages three to 20 years old is 44% of the total population in 2010. The proportion of pre-school age (3 to 5 years old) to the total population is 7.5%, the elementary school age (6 to 11 years old) is 15.8%, the secondary school age (12 to 15 years old) is 10.3% while the tertiary school age (16 to 20 years old) is 10.4% of the total population.

Population, Number of Households per Barangay, 2015

No. BARANGAY POPULATION (NSO 2015) HOUSEHOLD (2015)
Urban Barangays      
1 Bacolod 4,518 954
2 San Agustin 2,125 429
3 San Juan 2,161 474
4 San Julian 2,431 519
5 San Pedro 3,154 706
Sub-Total   14,389 3,082
Rural Barangays      
6  Bagsangan 2,961 667
7 Batang 2,231 484
8 Bolos 882 187
9 Buenavista 1,320 272
10 Bulawan 1,149 240
11 Carriedo 3,197 670
12 Casini 1,155 244
13 Cawayan 428 114
14 Cogon 1,164 266
15 Gabao 4,286 777
16 Gulang-gulang 2,925 600
17 Gumapia 719 169
18 Liang 943 200
19 Macawayan 2,873 595
20 Mapaso 860 180
21 Monbon 4,414 805
22 Patag 3,136 676
23 Salvacion 1,427 281
24 San Isidro 720 152
25 Sto. Domingo 950 226
26 Tabon-tabon 1,628 312
27 Tinampo 1,489 318
28 Tongdol 1,376 343
Sub-Total   42,273 9,138
TOTAL =->> 56,662 11,820

 

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