Barangay San Agustin

Barangay San Agustin forms part of Ibaan, a municipality in Batangas, 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 Agustin had a population of 2,636. This made it the 7th largest of 26 barangays in Ibaan by population, placing it in the upper half of the municipality. Residents of Barangay San Agustin accounted for approximately 4.51% of the total population of Ibaan, which stood at 58,507 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Agustin moving from 2,259 residents to 2,636 residents, an intercensal change of +16.7%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay San Agustin as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Ibaan is a municipality comprising 26 barangays, and serves as the governing unit directly responsible for local services in Barangay San Agustin, including public health, sanitation, peace and order, and civil registration. Within the wider province of Batangas, which contains 1,078 barangays across its component cities and municipalities, Barangay San Agustin ranks 360th by 2020 population. Batangas is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.