Barangay San Agustin

Situated in Sablayan, Occidental Mindoro, Barangay San Agustin is one of 22 barangays that make up the municipality within MIMAROPA Region.

According to the 2020 Philippine census, Barangay San Agustin had a population of 2,490. This made it the 16th largest of 22 barangays in Sablayan by population, placing it in the middle tier of the municipality. Residents of Barangay San Agustin accounted for approximately 2.69% of the total population of Sablayan, which stood at 92,598 in the same census year.

The barangay recorded 1,944 residents in the 2015 intercensal count and 2,490 residents in the 2020 Census — a net change of +28.1%, consistent with a growing settlement. Barangay San Agustin is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Sablayan is a municipality comprising 22 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 Occidental Mindoro, which contains 164 barangays across its component cities and municipalities, Barangay San Agustin ranks 80th by 2020 population. Occidental Mindoro is classified as a 2nd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay San Agustin 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.