Barangay San Agustin

Classified as a small barangay, Barangay San Agustin is one of the administrative divisions of Mondragon in Northern Samar, Eastern Visayas, Philippines.

According to the 2020 Philippine census, Barangay San Agustin had a population of 1,234. This made it the 12th largest of 24 barangays in Mondragon by population, placing it in the middle tier of the municipality. Residents of Barangay San Agustin accounted for approximately 2.98% of the total population of Mondragon, which stood at 41,415 in the same census year.

The barangay recorded 1,093 residents in the 2015 intercensal count and 1,234 residents in the 2020 Census — a net change of +12.9%, 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.

Mondragon is a municipality comprising 24 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 Northern Samar, which contains 569 barangays across its component cities and municipalities, Barangay San Agustin ranks 184th by 2020 population. Northern Samar 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.