Barangay Santo Rosario East

Barangay Santo Rosario East forms part of Aringay, a municipality in La Union, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Rosario East had a population of 1,509. This made it the 14th largest of 24 barangays in Aringay by population, placing it in the middle tier of the municipality. Residents of Barangay Santo Rosario East accounted for approximately 3.00% of the total population of Aringay, which stood at 50,380 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Santo Rosario East moving from 1,490 residents to 1,509 residents, an intercensal change of +1.3%. The trajectory indicates a slowly expanding community. The Philippine Statistics Authority classifies Barangay Santo Rosario East as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Aringay is a municipality comprising 24 barangays, and serves as the governing unit directly responsible for local services in Barangay Santo Rosario East, 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 Santo Rosario East ranks 190th 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.

Barangay Santo Rosario East 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.