Barangay Rosario (Pob.)

Classified as a mid-sized barangay, Barangay Rosario (Pob.) is one of the administrative divisions of Cervantes in Ilocos Sur, Ilocos Region, Philippines.

According to the 2020 Philippine census, Barangay Rosario (Pob.) had a population of 2,344. This made it the 1st largest of 13 barangays in Cervantes by population, placing it among the most populous barangays of the municipality. Residents of Barangay Rosario (Pob.) accounted for approximately 12.05% of the total population of Cervantes, which stood at 19,449 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Rosario (Pob.) changed from 2,115 to 2,344, a shift of +10.8% over the five-year period. This places the barangay among those with growing populations in Cervantes. Barangay Rosario (Pob.) is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Cervantes is a municipality comprising 13 barangays, and serves as the governing unit directly responsible for local services in Barangay Rosario (Pob.), 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 Rosario (Pob.) ranks 27th 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.

Barangay Rosario (Pob.) is governed by an elected Sangguniang Barangay composed of a Punong Barangay and seven kagawads, with the Sangguniang Kabataan representing the youth. The next BSKE, set for Monday, November 2, 2026, will elect officials to four-year terms as provided under Republic Act No. 12232.