Barangay San Antonio

Classified as a mid-sized barangay, Barangay San Antonio is one of the administrative divisions of City of Calapan in Oriental Mindoro, MIMAROPA Region, Philippines.

According to the 2020 Philippine census, Barangay San Antonio had a population of 3,521. This made it the 17th largest of 62 barangays in City of Calapan by population, placing it in the upper half of the city. Residents of Barangay San Antonio accounted for approximately 2.42% of the total population of City of Calapan, which stood at 145,786 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Antonio moving from 3,448 residents to 3,521 residents, an intercensal change of +2.1%. The trajectory indicates a growing community. Barangay San Antonio is officially classified as urban, reflecting the density and built-up character of the area.

City of Calapan is a city comprising 62 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 Oriental Mindoro, which contains 426 barangays across its component cities and municipalities, Barangay San Antonio ranks 60th by 2020 population. Oriental Mindoro 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.