Barangay San Antonio

Barangay San Antonio forms part of Biri, a municipality in Northern Samar, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Antonio had a population of 1,798. This made it the 2nd largest of 8 barangays in Biri by population, placing it in the upper half of the municipality. Residents of Barangay San Antonio accounted for approximately 15.95% of the total population of Biri, which stood at 11,274 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Antonio moving from 1,752 residents to 1,798 residents, an intercensal change of +2.6%. The trajectory indicates a growing community. Barangay San Antonio is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Biri is a municipality comprising 8 barangays, and serves as the governing unit directly responsible for local services in Barangay San Antonio, including public health, sanitation, peace and order, and civil registration. Within the wider province of Northern Samar, which contains 569 barangays across its component cities and municipalities, Barangay San Antonio ranks 91st by 2020 population. Northern Samar is classified as a 2nd 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.