Siayan, Province of Zamboanga del Norte

Summary data
Typemunicipality
Island groupMindanao
RegionZamboanga Peninsula (Region IX)
ProvinceZamboanga del Norte
Barangay count22
Postal code7113
Coastal/Landlockedlandlocked
Marine waterbodiesnone (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)
Coordinates8° 15' North, 123° 7' East (8.2513, 123.1134)
Estimated elevation above sea level79.9 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
BarangayPopulation percentage (2015)Population (2015)Population (2010)Change (2010‑2015)Annual Population Growth Rate (2010‑2015)
Balok3.94%1,3761,18116.51%2.95%
Balunokan2.18%764855-10.64%-2.12%
Datagan3.22%1,1251,333-15.60%-3.18%
Denoyan4.05%1,4171,07931.33%5.33%
Diongan6.92%2,4202,605-7.10%-1.39%
Domogok4.06%1,4211,03537.29%6.22%
Dumpilas2.73%9561,031-7.27%-1.43%
Gonayen2.49%872889-1.91%-0.37%
Guibo10.24%3,5803,893-8.04%-1.58%
Gunyan5.47%1,9111,60618.99%3.37%
Litolet3.12%1,0911,169-6.67%-1.31%
Macasing4.40%1,5381,972-22.01%-4.62%
Mangilay6.27%2,1922,374-7.67%-1.51%
Moyo5.29%1,8492,055-10.02%-1.99%
Muñoz2.80%9781,053-7.12%-1.40%
Pange3.96%1,3861,3105.80%1.08%
Paranglumba5.80%2,0272,128-4.75%-0.92%
Polayo3.16%1,1061,1000.55%0.10%
Sayaw1.90%664688-3.49%-0.67%
Seriac2.63%9198606.86%1.27%
Siayan Proper11.24%3,9313,7215.64%1.05%
Suguilon4.13%1,4431,05237.17%6.20%
Siayan Total34,96634,989-0.07%-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 YearAnnual Regular IncomeChange
200977,507,414.85
201082,070,386.015.89%
201190,600,408.9610.39%
201287,048,456.49-3.92%
201394,147,375.448.16%
2014107,198,645.7013.86%
2015122,625,577.7614.39%
2016134,245,137.709.48%

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
Age groupPopulation (2015)
Under 1858
1 to 44,001
5 to 94,952
10 to 144,598
15 to 193,804
20 to 242,991
25 to 292,425
30 to 342,063
35 to 391,869
40 to 441,802
45 to 491,454
50 to 541,272
55 to 591,008
60 to 64714
65 to 69418
70 to 74312
75 to 79219
80 and over206
Total34,966

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 datePopulationGrowth rate
9,193
13,9138.67%
18,4205.77%
24,3142.82%
27,9502.65%
33,0743.68%
34,5880.62%
34,9890.42%
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 Manila: 738.85 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.
(Back to top)