Barangay San Antonio

Classified as a small barangay, Barangay San Antonio is one of the administrative divisions of City of Alaminos in Pangasinan, Ilocos Region, Philippines.

According to the 2020 Philippine census, Barangay San Antonio had a population of 1,288. This made it the 36th largest of 39 barangays in City of Alaminos by population, placing it among the smaller barangays of the city. Residents of Barangay San Antonio accounted for approximately 1.30% of the total population of City of Alaminos, which stood at 99,397 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay San Antonio changed from 1,143 to 1,288, a shift of +12.7% over the five-year period. This places the barangay among those with growing populations in City of Alaminos. Barangay San Antonio is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

City of Alaminos is a city comprising 39 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 Pangasinan, which contains 1,364 barangays across its component cities and municipalities, Barangay San Antonio ranks 1011th by 2020 population. Pangasinan 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.