Barangay San Antonio

Barangay San Antonio forms part of Oton, a municipality in Iloilo, and is classified as a mid-sized barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Antonio had a population of 2,435. This made it the 16th largest of 37 barangays in Oton by population, placing it in the middle tier of the municipality. Residents of Barangay San Antonio accounted for approximately 2.47% of the total population of Oton, which stood at 98,509 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Antonio moving from 2,696 residents to 2,435 residents, an intercensal change of -9.7%. The trajectory indicates a contracting 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.

Oton is a municipality comprising 37 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 Iloilo, which contains 1,901 barangays across its component cities and municipalities, Barangay San Antonio ranks 170th by 2020 population. Iloilo 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.