Barangay San Antonio

Barangay San Antonio is a very small barangay in the municipality of Lopez, located in the province of Quezon, in the CALABARZON region of the Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Antonio had a population of 239. This made it the 84th largest of 95 barangays in Lopez by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Antonio accounted for approximately 0.25% of the total population of Lopez, which stood at 94,657 in the same census year.

The barangay recorded 239 residents in the 2015 intercensal count and 239 residents in the 2020 Census — a net change of 0.0%, consistent with a broadly stable 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.

Lopez is a municipality comprising 95 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 Quezon, which contains 1,242 barangays across its component cities and municipalities, Barangay San Antonio ranks 1148th by 2020 population. Quezon 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 Antonio 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.