Barangay Santo Rosario West

Situated in Aringay, La Union, Barangay Santo Rosario West is one of 24 barangays that make up the municipality within Ilocos Region.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Rosario West had a population of 1,965. This made it the 11th largest of 24 barangays in Aringay by population, placing it in the middle tier of the municipality. Residents of Barangay Santo Rosario West accounted for approximately 3.90% 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 West moving from 1,879 residents to 1,965 residents, an intercensal change of +4.6%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Santo Rosario West 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 West, 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 West ranks 110th 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 West 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.