Barangay San Antonio

Situated in Prieto Diaz, Sorsogon, Barangay San Antonio is one of 23 barangays that make up the municipality within Bicol Region.

According to the 2020 Philippine census, Barangay San Antonio had a population of 609. This made it the 20th largest of 23 barangays in Prieto Diaz by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Antonio accounted for approximately 2.69% of the total population of Prieto Diaz, which stood at 22,644 in the same census year.

The barangay recorded 548 residents in the 2015 intercensal count and 609 residents in the 2020 Census — a net change of +11.1%, consistent with a growing settlement. Barangay San Antonio is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Prieto Diaz is a municipality comprising 23 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 Sorsogon, which contains 541 barangays across its component cities and municipalities, Barangay San Antonio ranks 455th 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.

Like every Philippine barangay, Barangay San Antonio is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.