Barangay San Agustin

Barangay San Agustin forms part of Gerona, a municipality in Tarlac, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Agustin had a population of 1,779. This made it the 25th largest of 44 barangays in Gerona by population, placing it in the middle tier of the municipality. Residents of Barangay San Agustin accounted for approximately 1.88% of the total population of Gerona, which stood at 94,485 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Agustin moving from 1,463 residents to 1,779 residents, an intercensal change of +21.6%. The trajectory indicates a growing community. Barangay San Agustin is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Gerona is a municipality comprising 44 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 Tarlac, which contains 511 barangays across its component cities and municipalities, Barangay San Agustin ranks 292nd by 2020 population. Tarlac is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay San Agustin 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.