Barangay Dabubu Grande

Barangay Dabubu Grande forms part of San Agustin, a municipality in Isabela, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Dabubu Grande had a population of 1,375. This made it the 5th largest of 23 barangays in San Agustin by population, placing it in the upper half of the municipality. Residents of Barangay Dabubu Grande accounted for approximately 6.22% of the total population of San Agustin, which stood at 22,096 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Dabubu Grande changed from 1,396 to 1,375, a shift of -1.5% over the five-year period. This places the barangay among those with broadly stable populations in San Agustin. Barangay Dabubu Grande is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Agustin is a municipality comprising 23 barangays, and serves as the governing unit directly responsible for local services in Barangay Dabubu Grande, including public health, sanitation, peace and order, and civil registration. Within the wider province of Isabela, which contains 1,055 barangays across its component cities and municipalities, Barangay Dabubu Grande ranks 467th by 2020 population. Isabela is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Dabubu Grande 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.