Ilocos Sur

Summary data
Map of the Philippines highlighting Ilocos Sur
Typeprovince
Island groupLuzon
RegionIlocos Region (Region I)
Cities2
Municipalities32
Barangays768
Coastal/Landlockedcoastal
Marine waterbodiesSouth China Sea
Area (2007)2,596.00 km2 (1,002.32 sq mi)
Population (2015)689,668
Density (2015)266 / km2 (688 / sq mi)

Ilocos Sur is a province in the Philippines situated in the Ilocos Region occupying the northwestern section of Luzon. Its capital is the City of Vigan.

The province has a land area of 2,596.00 square kilometers or 1,002.32 square miles. Its population as determined by the 2015 Census was 689,668. This represented 13.72% of the total population of the Ilocos Region, 1.20% of the overall population of the Luzon island group, or 0.68% of the entire population of the Philippines. Based on these figures, the population density is computed at 266 inhabitants per square kilometer or 688 inhabitants per square mile.

Map

Ilocos Sur is bordered, clockwise from the North, by Ilocos Norte, Abra, Mountain Province, Benguet, La Union, and the South China Sea.

details

Local government units

Ilocos Sur has 32 municipalities and 2 cities. The total number of barangays in the province is 768.

details
NameTypePopulation (2015)Population (2010)Annual Population Growth Rate (2010‑2015)Area (2007), in km2Density (2015), per km2Brgy count
Alilemmunicipality6,6956,6400.16%119.33569
Banayoyomunicipality7,7487,6940.13%24.6331514
Bantaymunicipality35,73134,3230.77%76.6046634
Burgosmunicipality12,22411,6790.87%44.3827526
Cabugaomunicipality37,50135,7060.94%95.5639233
Candoncity (CC)60,62357,8840.88%103.2858742
Caoayanmunicipality19,86118,5511.31%17.421,14017
Cervantesmunicipality17,21116,5730.72%234.707313
Galimuyodmunicipality10,74810,0111.36%34.4031224
Gregorio del Pilarmunicipality4,8754,2192.79%41.661177
Lidliddamunicipality4,6474,3981.05%33.8413711
Magsingalmunicipality30,79228,3021.62%84.9836230
Nagbukelmunicipality5,2594,9381.21%43.1212212
Narvacanmunicipality44,00642,8030.53%122.2136034
Quirinomunicipality8,5738,5350.08%240.10369
Salcedomunicipality11,28810,9350.61%103.4410921
San Emiliomunicipality7,4077,427-0.05%141.44528
San Estebanmunicipality8,3498,0720.64%19.6242610
San Ildefonsomunicipality7,7877,0751.84%11.3568615
San Juanmunicipality26,41125,1990.90%64.3741032
San Vicentemunicipality12,75811,7201.63%12.601,0137
Santamunicipality15,34015,1060.29%109.1014126
Santa Catalinamunicipality13,94513,5970.48%9.681,4419
Santa Cruzmunicipality39,86837,9110.96%88.7844949
Santa Luciamunicipality25,40224,9810.32%49.7251136
Santa Mariamunicipality30,32128,5971.12%63.3147933
Santiagomunicipality18,75917,9580.83%46.3640524
Santo Domingomunicipality27,97527,5960.26%55.4950436
Sigaymunicipality2,7372,4192.38%81.55347
Sinaitmunicipality25,64025,4270.16%65.5639144
Sugponmunicipality4,5853,8203.54%57.11806
Suyomunicipality11,44610,6221.43%124.00928
Tagudinmunicipality39,27738,1220.57%151.1926043
Vigancity (CC), capital53,87949,7471.53%25.122,14539
Ilocos Sur Total689,668658,5870.88%2,596.00266768

Economy

According to the Bureau of Local Government Finance, the annual regular revenue of Ilocos Sur for the fiscal year of 2016 was 3,285,231,293.03.

details
Fiscal YearAnnual Regular IncomeChange
2009734,945,745.61
20101,840,408,798.55150.41%
20111,850,393,845.570.54%
20121,563,288,028.36-15.52%
20132,459,006,230.6857.30%
20141,194,116,437.46-51.44%
20151,311,914,281.759.86%
20163,285,231,293.03150.42%

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 Ilocos Sur is 5 to 9, with 65,500 individuals. Conversely, the age group with the lowest population is 75 to 79, with 10,438 individuals.

details
Age groupPopulation (2015)
Under 111,799
1 to 451,547
5 to 965,500
10 to 1465,108
15 to 1960,952
20 to 2459,716
25 to 2954,089
30 to 3452,219
35 to 3947,762
40 to 4441,072
45 to 4939,350
50 to 5434,810
55 to 5929,324
60 to 6423,517
65 to 6917,429
70 to 7412,873
75 to 7910,438
80 and over12,163
Total689,668

Historical population

The population of Ilocos Sur grew from 338,058 in 1960 to 689,668 in 2015, an increase of 351,610 people. The latest census figures in 2015 denote a positive growth rate of 0.88%, or an increase of 31,081 people, from the previous population of 658,587 in 2010.

details
Census datePopulationGrowth rate
189,572
247,4581.70%
271,5320.47%
276,2780.18%
338,0581.79%
385,1391.28%
419,7761.74%
443,5911.11%
519,9661.60%
545,3850.90%
594,2061.86%
633,1380.88%
658,5871.44%
689,6680.88%

National roads

As of December 2016, the National Roads in Ilocos Sur as classified by the Department of Public Works and Highways are:

Primary Roads

  • Manila North Road

Secondary Roads

  • Bantay-Vigan Road Extension
  • Bantay-Vigan Road
  • Cervantes-Bontoc Road
  • Ilocos Sur-Abra Road
  • Salomague Port Road
  • Sulvec Port Road
  • Tagudin-Cervantes Road
  • Vigan Airport Road

Tertiary Roads

  • Alilem-Sugpon-Sudipen Road
  • Bantay-San Vicente Road
  • Bayubay-Santa Catalina Road
  • Bulag-Camp Quirino Road
  • Burgos-Lidlidda Road
  • Cervantes-Mankayan-Abatan Road
  • Cervantes-Quirino Road
  • Junction Candon-Salcedo-Del Pilar Road
  • Junction Santa Cruz-Pinipin Road
  • Junction Santa Lucia-Salcedo Road
  • Junction Santiago-Banayoyo-Lidlidda-San Emilio-Quirino Road
  • Mountain Province-Ilocos Sur via Kayan Road
  • Quirino-Pandan Road
  • Santa Maria Poblacion Road
  • Santa Maria-Burgos Road
  • Santa-Rancho Road
  • Vigan-Caoayan Road
  • Vigan-San Vicente Road
  • Vigan-Santa Catalina Road

National rankings

  • Population (2015): 689,668, ranked 42 out of 81
  • Land area (2007): 1,002.32 square kilometers, ranked 54 out of 81
  • Population density (2015): 266 inhabitants per square kilometer, ranked 30 out of 81
  • Annual population growth rate (2010 to 2015): 0.88%, ranked 72 out of 81

Notes

  1. Unless otherwise specified, population count (excluding percentages) and land area figures are derived from the Philippine Statistics Authority.
  2. Maps utilize OpenStreetMap data available under the Open Data Commons Open Database License.
  3. Data on annual regular income is from the Bureau of Local Government Finance, Department of Finance
  4. Data on National Roads is from the Department of Public Works and Highways.
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