Barangay Bannagao

Barangay Bannagao forms part of Aurora, a municipality in Isabela, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Bannagao had a population of 1,142. This made it the 11th largest of 33 barangays in Aurora by population, placing it in the middle tier of the municipality. Residents of Barangay Bannagao accounted for approximately 3.12% of the total population of Aurora, which stood at 36,621 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Bannagao changed from 1,154 to 1,142, a shift of -1.0% over the five-year period. This places the barangay among those with broadly stable populations in Aurora. Barangay Bannagao is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Aurora is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Bannagao, 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 Bannagao ranks 568th 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.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.