Barangay San Antonio

Situated in Santa Marcela, Apayao, Barangay San Antonio is one of 13 barangays that make up the municipality within CAR.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Antonio had a population of 811. This made it the 11th largest of 13 barangays in Santa Marcela by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Antonio accounted for approximately 6.09% of the total population of Santa Marcela, which stood at 13,317 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Antonio moving from 822 residents to 811 residents, an intercensal change of -1.3%. The trajectory indicates a broadly stable community. 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.

Santa Marcela is a municipality comprising 13 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 Apayao, which contains 133 barangays across its component cities and municipalities, Barangay San Antonio ranks 66th by 2020 population. Apayao is classified as a 3rd 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.