The total population of Ilocos Sur as of 01 May 2020 is 706,009 based on the 2020 Census of Population and Housing (CPH) conducted by the Philippine Statistics Authority (PSA). This count is declared official for all purposes by the President of the Philippines, pursuant to Proclamation No. 1179 dated 06 July 2021.

The population of the province increased by 16,341 from 689,668 in 2015, which translates to an annual population growth rate of 0.49 percent. By comparison, the rate at which the province’s population grew during the period 2010 to 2015 was higher at 0.88 percent.

Of the 34 cities/municipalities in Ilocos Sur, the city of Candon had the biggest population with 61,432, followed by the city of Vigan with 53,935, and Narvacan with 46,234. The combined population of these three cities/municipalities accounted for about 22.9 percent of the total population of Ilocos Sur in 2020. Municipalities with the least population were Sigay (2,552), Gregorio Del Pilar (4,472), and Lidlidda (4,705).

At the barangay level, barangay Puro, Magsingal recorded the highest population in 2020 with 4,785, followed by barangay Tablac in the city of Candon with 3,562, and barangay Ayusan Norte in the city of Vigan with 3,526. On the other hand, the three least populated barangays in the province were Montero in Banayoyo with 114, Belen in San Ildefonso with 120, and Lesseb in Burgos with 142.

The statistical tables of this Press Release can be accessed on the PSA website at https://psa.gov.ph/population-and-housing/statistical-tables. 

(SGD) REYNOR R. FERNANDO

     Chief Statistical Specialist