Barangay San Sebastian

Barangay San Sebastian forms part of Santa Magdalena, a municipality in Sorsogon, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Sebastian had a population of 882. This made it the 10th largest of 14 barangays in Santa Magdalena by population, placing it in the middle tier of the municipality. Residents of Barangay San Sebastian accounted for approximately 5.16% of the total population of Santa Magdalena, which stood at 17,096 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Sebastian moving from 917 residents to 882 residents, an intercensal change of -3.8%. The trajectory indicates a contracting community. Barangay San Sebastian is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Santa Magdalena is a municipality comprising 14 barangays, and serves as the governing unit directly responsible for local services in Barangay San Sebastian, including public health, sanitation, peace and order, and civil registration. Within the wider province of Sorsogon, which contains 541 barangays across its component cities and municipalities, Barangay San Sebastian ranks 365th by 2020 population. Sorsogon is classified as a 2nd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay San Sebastian 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.