Barangay Tagbac Sur

Situated in Oton, Iloilo, Barangay Tagbac Sur is one of 37 barangays that make up the municipality within Western Visayas.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Tagbac Sur had a population of 1,797. This made it the 20th largest of 37 barangays in Oton by population, placing it in the middle tier of the municipality. Residents of Barangay Tagbac Sur accounted for approximately 1.82% of the total population of Oton, which stood at 98,509 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Tagbac Sur moving from 2,061 residents to 1,797 residents, an intercensal change of -12.8%. The trajectory indicates a contracting community. The Philippine Statistics Authority classifies Barangay Tagbac Sur as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Oton is a municipality comprising 37 barangays, and serves as the governing unit directly responsible for local services in Barangay Tagbac Sur, including public health, sanitation, peace and order, and civil registration. Within the wider province of Iloilo, which contains 1,901 barangays across its component cities and municipalities, Barangay Tagbac Sur ranks 329th by 2020 population. Iloilo 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.