Barangay San Antonio

Classified as a very small barangay, Barangay San Antonio is one of the administrative divisions of San Lorenzo Ruiz in Camarines Norte, Bicol Region, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Antonio had a population of 486. This made it the 11th largest of 12 barangays in San Lorenzo Ruiz by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Antonio accounted for approximately 3.08% of the total population of San Lorenzo Ruiz, which stood at 15,757 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay San Antonio changed from 476 to 486, a shift of +2.1% over the five-year period. This places the barangay among those with growing populations in San Lorenzo Ruiz. The Philippine Statistics Authority classifies Barangay San Antonio as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Lorenzo Ruiz is a municipality comprising 12 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 Camarines Norte, which contains 282 barangays across its component cities and municipalities, Barangay San Antonio ranks 272nd by 2020 population. Camarines Norte is classified as a 2nd 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.