Barangay Santo Tomas

Barangay Santo Tomas is a small barangay in the city of City of Ilagan, located in the province of Isabela, in the Cagayan Valley region of the Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Tomas had a population of 1,021. This made it the 62nd largest of 91 barangays in City of Ilagan by population, placing it in the middle tier of the city. Residents of Barangay Santo Tomas accounted for approximately 0.65% of the total population of City of Ilagan, which stood at 158,218 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Santo Tomas moving from 893 residents to 1,021 residents, an intercensal change of +14.3%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Santo Tomas as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

City of Ilagan is a city comprising 91 barangays, and serves as the governing unit directly responsible for local services in Barangay Santo Tomas, 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 Santo Tomas ranks 642nd 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 Santo Tomas 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.