Barangay Poblacion Barangay 1

Classified as a small barangay, Barangay Poblacion Barangay 1 is one of the administrative divisions of San Sebastian in Samar, Eastern Visayas, Philippines.

According to the 2020 Philippine census, Barangay Poblacion Barangay 1 had a population of 729. This made it the 6th largest of 14 barangays in San Sebastian by population, placing it in the middle tier of the municipality. Residents of Barangay Poblacion Barangay 1 accounted for approximately 8.38% of the total population of San Sebastian, which stood at 8,704 in the same census year.

The barangay recorded 686 residents in the 2015 intercensal count and 729 residents in the 2020 Census — a net change of +6.3%, consistent with a growing settlement. Barangay Poblacion Barangay 1 is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Sebastian is a municipality comprising 14 barangays, and serves as the governing unit directly responsible for local services in Barangay Poblacion Barangay 1, including public health, sanitation, peace and order, and civil registration. Within the wider province of Samar, which contains 951 barangays across its component cities and municipalities, Barangay Poblacion Barangay 1 ranks 352nd by 2020 population. Samar is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Poblacion Barangay 1 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.