Barangay San Antonio

Situated in Milagros, Masbate, Barangay San Antonio is one of 27 barangays that make up the municipality within Bicol Region.

According to the 2020 Philippine census, Barangay San Antonio had a population of 974. This made it the 23rd largest of 27 barangays in Milagros by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Antonio accounted for approximately 1.69% of the total population of Milagros, which stood at 57,538 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay San Antonio changed from 1,210 to 974, a shift of -19.5% over the five-year period. This places the barangay among those with contracting populations in Milagros. Barangay San Antonio is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Milagros is a municipality comprising 27 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 Masbate, which contains 550 barangays across its component cities and municipalities, Barangay San Antonio ranks 376th by 2020 population. Masbate is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay San Antonio 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.