Barangay Biga Oriental

Barangay Biga Oriental forms part of Santo Tomas, a municipality in Isabela, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Biga Oriental had a population of 717. This made it the 15th largest of 27 barangays in Santo Tomas by population, placing it in the middle tier of the municipality. Residents of Barangay Biga Oriental accounted for approximately 2.92% of the total population of Santo Tomas, which stood at 24,528 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Biga Oriental moving from 665 residents to 717 residents, an intercensal change of +7.8%. The trajectory indicates a growing community. Barangay Biga Oriental is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Santo Tomas is a municipality comprising 27 barangays, and serves as the governing unit directly responsible for local services in Barangay Biga Oriental, 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 Biga Oriental ranks 816th 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.