Barangay San Antonio

Classified as a mid-sized barangay, Barangay San Antonio is one of the administrative divisions of Basco in Batanes, Cagayan Valley, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Antonio had a population of 2,247. This made it the 2nd largest of 6 barangays in Basco by population, placing it in the upper half of the municipality. Residents of Barangay San Antonio accounted for approximately 23.61% of the total population of Basco, which stood at 9,517 in the same census year.

The barangay recorded 1,969 residents in the 2015 intercensal count and 2,247 residents in the 2020 Census — a net change of +14.1%, consistent with a growing settlement. 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.

Basco is a municipality comprising 6 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 Batanes, which contains 29 barangays across its component cities and municipalities, Barangay San Antonio ranks 2nd by 2020 population. Batanes is classified as a 5th 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.