Barangay Bayubay Sur

Barangay Bayubay Sur is a small barangay in the municipality of San Vicente, located in the province of Ilocos Sur, in the Ilocos Region region of the Philippines.

According to the 2020 Philippine census, Barangay Bayubay Sur had a population of 1,822. This made it the 3rd largest of 7 barangays in San Vicente by population, placing it in the upper half of the municipality. Residents of Barangay Bayubay Sur accounted for approximately 13.89% of the total population of San Vicente, which stood at 13,118 in the same census year.

The barangay recorded 1,685 residents in the 2015 intercensal count and 1,822 residents in the 2020 Census — a net change of +8.1%, consistent with a growing settlement. Barangay Bayubay Sur is officially classified as urban, reflecting the density and built-up character of the area.

San Vicente is a municipality comprising 7 barangays, and serves as the governing unit directly responsible for local services in Barangay Bayubay 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 Bayubay Sur ranks 68th 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 Bayubay Sur 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.