Barangay Cupang

Barangay Cupang forms part of Santo Tomas, a municipality in La Union, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Cupang had a population of 1,599. This made it the 14th largest of 24 barangays in Santo Tomas by population, placing it in the middle tier of the municipality. Residents of Barangay Cupang accounted for approximately 3.91% of the total population of Santo Tomas, which stood at 40,846 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Cupang moving from 1,484 residents to 1,599 residents, an intercensal change of +7.7%. The trajectory indicates a growing community. Barangay Cupang 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 24 barangays, and serves as the governing unit directly responsible for local services in Barangay Cupang, including public health, sanitation, peace and order, and civil registration. Within the wider province of La Union, which contains 576 barangays across its component cities and municipalities, Barangay Cupang ranks 169th by 2020 population. La Union 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.