Barangay San Agustin (Pob.)

Classified as a small barangay, Barangay San Agustin (Pob.) is one of the administrative divisions of Sarrat in Ilocos Norte, Ilocos Region, Philippines.

According to the 2020 Philippine census, Barangay San Agustin (Pob.) had a population of 565. This made it the 23rd largest of 24 barangays in Sarrat by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Agustin (Pob.) accounted for approximately 2.24% of the total population of Sarrat, which stood at 25,186 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Agustin (Pob.) moving from 604 residents to 565 residents, an intercensal change of -6.5%. The trajectory indicates a contracting community. Barangay San Agustin (Pob.) is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Sarrat is a municipality comprising 24 barangays, and serves as the governing unit directly responsible for local services in Barangay San Agustin (Pob.), including public health, sanitation, peace and order, and civil registration. Within the wider province of Ilocos Norte, which contains 559 barangays across its component cities and municipalities, Barangay San Agustin (Pob.) ranks 470th by 2020 population. Ilocos Norte 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 (Pob.) 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.