Barangay San Andres

Barangay San Andres forms part of Delfin Albano, a municipality in Isabela, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Andres had a population of 572. This made it the 22nd largest of 29 barangays in Delfin Albano by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Andres accounted for approximately 1.91% of the total population of Delfin Albano, which stood at 29,928 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Andres moving from 505 residents to 572 residents, an intercensal change of +13.3%. The trajectory indicates a growing community. Barangay San Andres is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Delfin Albano is a municipality comprising 29 barangays, and serves as the governing unit directly responsible for local services in Barangay San Andres, 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 San Andres ranks 900th 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.