Barangay San Agustin

Barangay San Agustin is a small barangay in the municipality of San Rafael, located in the province of Bulacan, in the Central Luzon region of the Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Agustin had a population of 1,745. This made it the 21st largest of 34 barangays in San Rafael by population, placing it in the middle tier of the municipality. Residents of Barangay San Agustin accounted for approximately 1.69% of the total population of San Rafael, which stood at 103,097 in the same census year.

The barangay recorded 1,486 residents in the 2015 intercensal count and 1,745 residents in the 2020 Census — a net change of +17.4%, consistent with a growing settlement. 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.

San Rafael is a municipality comprising 34 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 Bulacan, which contains 569 barangays across its component cities and municipalities, Barangay San Agustin ranks 510th by 2020 population. Bulacan 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 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.