Barangay San Agustin (Pob.)

Barangay San Agustin (Pob.) forms part of Bay, a municipality in Laguna, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Agustin (Pob.) had a population of 1,432. This made it the 14th largest of 15 barangays in Bay by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Agustin (Pob.) accounted for approximately 2.13% of the total population of Bay, which stood at 67,182 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Agustin (Pob.) moving from 1,428 residents to 1,432 residents, an intercensal change of +0.3%. The trajectory indicates a slowly expanding 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.

Bay is a municipality comprising 15 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 Laguna, which contains 681 barangays across its component cities and municipalities, Barangay San Agustin (Pob.) ranks 417th by 2020 population. Laguna 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 (Pob.) 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.