Summary data
Type Municipality
Island group Mindanao
Region Zamboanga Peninsula (Region IX)
Province Zamboanga del Norte
Barangay count 22
Postal code 7113
Coastal/Landlocked landlocked
Marine waterbodies none (landlocked)
Philippine major island(s) Mindanao
Area (2007) 494.75 km2 (191.02 sq mi)
Population (2015) 34,966
Density (2015) 71 / km2 (183 / sq mi)
Coordinates 8° 15′ North, 123° 7′ East (8.2513, 123.1134)
Estimated elevation above sea level 79.9 meters (262.1 feet)

Siayan is a landlocked municipality in the coastal province of Zamboanga del Norte.

The municipality has a land area of 494.75 square kilometers or 191.02 square miles which constitutes 6.78% of Zamboanga del Norte’s total area. Its population as determined by the 2015 Census was 34,966. This represented 3.46% of the total population of Zamboanga del Norte province, or 0.96% of the overall population of the Zamboanga Peninsula region. Based on these figures, the population density is computed at 71 inhabitants per square kilometer or 183 inhabitants per square mile.

 

Barangays

Siayan has 22 barangays as shown in the following table.

Demographic profile of barangays
Barangay Population percentage (2015) Population (2015) Population (2010) Change (2010‑2015) Annual Population Growth Rate (2010‑2015)
Balok 3.94% 1,376 1,181 16.51% 2.95%
Balunokan 2.18% 764 855 -10.64% -2.12%
Datagan 3.22% 1,125 1,333 -15.60% -3.18%
Denoyan 4.05% 1,417 1,079 31.33% 5.33%
Diongan 6.92% 2,420 2,605 -7.10% -1.39%
Domogok 4.06% 1,421 1,035 37.29% 6.22%
Dumpilas 2.73% 956 1,031 -7.27% -1.43%
Gonayen 2.49% 872 889 -1.91% -0.37%
Guibo 10.24% 3,580 3,893 -8.04% -1.58%
Gunyan 5.47% 1,911 1,606 18.99% 3.37%
Litolet 3.12% 1,091 1,169 -6.67% -1.31%
Macasing 4.40% 1,538 1,972 -22.01% -4.62%
Mangilay 6.27% 2,192 2,374 -7.67% -1.51%
Moyo 5.29% 1,849 2,055 -10.02% -1.99%
Muñoz 2.80% 978 1,053 -7.12% -1.40%
Pange 3.96% 1,386 1,310 5.80% 1.08%
Paranglumba 5.80% 2,027 2,128 -4.75% -0.92%
Polayo 3.16% 1,106 1,100 0.55% 0.10%
Sayaw 1.90% 664 688 -3.49% -0.67%
Seriac 2.63% 919 860 6.86% 1.27%
Siayan Proper 11.24% 3,931 3,721 5.64% 1.05%
Suguilon 4.13% 1,443 1,052 37.17% 6.20%
Siayan Total 34,966 34,989 -0.07% -0.01%

 

Economy

According to the Bureau of Local Government Finance, the annual regular revenue of Siayan for the fiscal year of 2016 was 134,245,137.70.

details
Fiscal Year Annual Regular Income Change
2009 77,507,414.85
2010 82,070,386.01 5.89%
2011 90,600,408.96 10.39%
2012 87,048,456.49 -3.92%
2013 94,147,375.44 8.16%
2014 107,198,645.70 13.86%
2015 122,625,577.76 14.39%
2016 134,245,137.70 9.48%

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 Siayan is 5 to 9, with 4,952 individuals. Conversely, the age group with the lowest population is 80 and over, with 206 individuals.

details

Combining age groups together, those aged 14 and below, consisting of the the young dependent population which include infants/babies, children and young adolescents/teenagers, make up an aggregate of 41.21% (14,409). Those aged 15 up to 64, roughly, the economically active population and actual or potential members of the work force, constitute a total of 55.49% (19,402). Finally, old dependent population consisting of the senior citizens, those aged 65 and over, total 3.30% (1,155) in all.

The computed Age Dependency Ratios mean that among the population of Siayan, there are 74 youth dependents to every 100 of the working age population; there are 6 aged/senior citizens to every 100 of the working population; and overall, there are 80 dependents (young and old-age) to every 100 of the working population.

The median age of 19 indicates that half of the entire population of Siayan are aged less than 19 and the other half are over the age of 19.

Age group Population (2015) Age group percentage
Under 1 858 2.45%
1 to 4 4,001 11.44%
5 to 9 4,952 14.16%
10 to 14 4,598 13.15%
15 to 19 3,804 10.88%
20 to 24 2,991 8.55%
25 to 29 2,425 6.94%
30 to 34 2,063 5.90%
35 to 39 1,869 5.35%
40 to 44 1,802 5.15%
45 to 49 1,454 4.16%
50 to 54 1,272 3.64%
55 to 59 1,008 2.88%
60 to 64 714 2.04%
65 to 69 418 1.20%
70 to 74 312 0.89%
75 to 79 219 0.63%
80 and over 206 0.59%
Total 34,966 100.00%
  • Youth Dependency Ratio: 74.27
  • Old Age Dependency Ratio: 5.95
  • Total Dependency Ratio: 80.22
  • Median Age: 19.04

 

Historical population

The population of Siayan grew from 9,193 in 1970 to 34,966 in 2015, an increase of 25,773 people. The latest census figures in 2015 denote a negative growth rate of 0.01%, or a decrease of 23 people, from the previous population of 34,989 in 2010.

details
Census date Population Growth rate
9,193
13,913 8.67%
18,420 5.77%
24,314 2.82%
27,950 2.65%
33,074 3.68%
34,588 0.62%
34,989 0.42%
34,966 -0.01%

 

Location

The municipal center of Siayan is situated at approximately 8° 15′ North, 123° 7′ East, in the island of Mindanao. Elevation at these coordinates is estimated at 79.9 meters or 262.1 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 Siayan are Dipolog, Dapitan, Pagadian, Tangub, Oroquieta, and Ozamiz. The nearest municipalities are Sindangan, Jose Dalman, Leon B. Postigo, Dumingag, Manukan, and President Manuel A. Roxas. Its distance from the national capital is 738.85 kilometers (459.10 miles). The following list delineates such distance measurements.

great-circle distance

Nearest towns

Nearest cities

Distance from Manila738.85 kilometers (459.10 miles) to the North‑Northwest (N18°W)

 

National rankings

  • Population (2015): 34,966, ranked 731 out of 1,634
  • Land area (2007): 191.02 square kilometers, ranked 142 out of 1,634
  • Population density (2015): 71 inhabitants per square kilometer, ranked 1,372 out of 1,634
  • Annual population growth rate (2010 to 2015): -0.01%, ranked 245 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.

 

(source: Philatlas)