Barangay Santo Tomas

Situated in Luisiana, Laguna, Barangay Santo Tomas is one of 23 barangays that make up the municipality within CALABARZON.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Tomas had a population of 1,755. This made it the 5th largest of 23 barangays in Luisiana by population, placing it in the upper half of the municipality. Residents of Barangay Santo Tomas accounted for approximately 8.41% of the total population of Luisiana, which stood at 20,859 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Santo Tomas changed from 1,799 to 1,755, a shift of -2.4% over the five-year period. This places the barangay among those with contracting populations in Luisiana. 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.

Luisiana is a municipality comprising 23 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 Laguna, which contains 681 barangays across its component cities and municipalities, Barangay Santo Tomas ranks 386th by 2020 population. Laguna 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.