Barangay Poblacion Sur

Situated in Gregorio Del Pilar, Ilocos Sur, Barangay Poblacion Sur is one of 7 barangays that make up the municipality within Ilocos Region.

According to the 2020 Philippine census, Barangay Poblacion Sur had a population of 483. This made it the 6th largest of 7 barangays in Gregorio Del Pilar by population, placing it among the smaller barangays of the municipality. Residents of Barangay Poblacion Sur accounted for approximately 10.80% of the total population of Gregorio Del Pilar, which stood at 4,472 in the same census year.

The barangay recorded 640 residents in the 2015 intercensal count and 483 residents in the 2020 Census — a net change of -24.5%, consistent with a contracting settlement. Barangay Poblacion Sur is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Gregorio Del Pilar is a municipality comprising 7 barangays, and serves as the governing unit directly responsible for local services in Barangay Poblacion Sur, including public health, sanitation, peace and order, and civil registration. Within the wider province of Ilocos Sur, which contains 768 barangays across its component cities and municipalities, Barangay Poblacion Sur ranks 593rd by 2020 population. Ilocos Sur is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.