Barangay San Antonino

Barangay San Antonino is a small barangay in the municipality of Agoo, located in the province of La Union, in the Ilocos Region region of the Philippines.

According to the 2020 Philippine census, Barangay San Antonino had a population of 1,125. This made it the 29th largest of 49 barangays in Agoo by population, placing it in the middle tier of the municipality. Residents of Barangay San Antonino accounted for approximately 1.70% of the total population of Agoo, which stood at 66,028 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Antonino moving from 1,009 residents to 1,125 residents, an intercensal change of +11.5%. The trajectory indicates a growing community. Barangay San Antonino is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Agoo is a municipality comprising 49 barangays, and serves as the governing unit directly responsible for local services in Barangay San Antonino, including public health, sanitation, peace and order, and civil registration. Within the wider province of La Union, which contains 576 barangays across its component cities and municipalities, Barangay San Antonino ranks 307th by 2020 population. La Union is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay San Antonino 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.