San Ildefonso, Province of Ilocos Sur

Summary data
Typemunicipality
Island groupLuzon
RegionIlocos Region (Region I)
ProvinceIlocos Sur
Barangay count15
Postal code2728
Coastal/Landlockedlandlocked
Marine waterbodiesnone (landlocked)
Philippine major island(s)Luzon
Area (2007)11.35 km2 (4.38 sq mi)
Population (2015)7,787
Density (2015)686 / km2 (1,778 / sq mi)
Coordinates17° 37' North, 120° 24' East (17.6249, 120.3931)
Estimated elevation above sea level14.3 meters (46.8 feet)

San Ildefonso is a landlocked municipality in the coastal province of Ilocos Sur.

The municipality has a land area of 11.35 square kilometers or 4.38 square miles which constitutes 0.44% of Ilocos Sur's total area. Its population as determined by the 2015 Census was 7,787. This represented 1.13% of the total population of Ilocos Sur province, or 0.15% of the overall population of the Ilocos Region. Based on these figures, the population density is computed at 686 inhabitants per square kilometer or 1,778 inhabitants per square mile.

Barangays

San Ildefonso has 15 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)
Arnap2.80%218247-11.74%-2.35%
Bahet10.74%836843-0.83%-0.16%
Belen1.80%1401335.26%0.98%
Bungro9.02%7026508.00%1.48%
Busiing Norte10.58%8247618.28%1.53%
Busiing Sur7.50%5845466.96%1.29%
Dongalo4.46%34730912.30%2.23%
Gongogong4.31%3363137.35%1.36%
Iboy5.73%4464206.19%1.15%
Kinamantirisan3.54%2762644.55%0.85%
Otol‑Patac6.24%48639323.66%4.13%
Poblacion East12.85%1,00164355.68%8.79%
Poblacion West7.18%559561-0.36%-0.07%
Sagneb4.31%336341-1.47%-0.28%
Sagsagat8.94%6966516.91%1.28%
San Ildefonso Total7,7877,07510.06%1.84%

Economy

According to the Bureau of Local Government Finance, the annual regular revenue of San Ildefonso for the fiscal year of 2016 was 73,904,829.68.

details
Fiscal YearAnnual Regular IncomeChange
200925,549,865.86
201050,763,086.4598.68%
201145,097,038.34-11.16%
201235,567,149.49-21.13%
201341,101,866.8715.56%
201431,219,136.76-24.04%
201559,023,109.8989.06%
201673,904,829.6825.21%

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 San Ildefonso is 10 to 14, with 869 individuals. Conversely, the age group with the lowest population is 80 and over, with 89 individuals.

details
Age groupPopulation (2015)
Under 1104
1 to 4536
5 to 9689
10 to 14869
15 to 19691
20 to 24712
25 to 29646
30 to 34579
35 to 39574
40 to 44470
45 to 49446
50 to 54368
55 to 59307
60 to 64275
65 to 69196
70 to 74127
75 to 79109
80 and over89
Total7,787

Historical population

The population of San Ildefonso grew from 2,601 in 1960 to 7,787 in 2015, an increase of 5,186 people. The latest census figures in 2015 denote a positive growth rate of 1.84%, or an increase of 712 people, from the previous population of 7,075 in 2010.

details
Census datePopulationGrowth rate
2,601
3,4002.66%
3,249-0.91%
3,6402.30%
4,5282.21%
5,2322.74%
5,5841.41%
6,6702.48%
7,0752.17%
7,7871.84%

Location

The municipal center of San Ildefonso is situated at approximately 17° 37' North, 120° 24' East, in the island of Luzon. Elevation at these coordinates is estimated at 14.3 meters or 46.8 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 San Ildefonso are Vigan, Candon, Batac, Laoag, San Fernando, and Tabuk. The nearest municipalities are Santo Domingo, San Vicente, Bantay, Santa Catalina, Magsingal, and Caoayan. Its distance from the national capital is 341.59 kilometers (212.26 miles). The following list delineates such distance measurements.

great-circle distance

Nearest towns

Nearest cities

Distance from Manila: 341.59 kilometers (212.26 miles) to the South (S11°E)

National rankings

  • Population (2015): 7,787, ranked 1,552 out of 1,634
  • Land area (2007): 4.38 square kilometers, ranked 1,597 out of 1,634
  • Population density (2015): 686 inhabitants per square kilometer, ranked 263 out of 1,634
  • Annual population growth rate (2010 to 2015): 1.84%, ranked 1,220 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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