Barangay Poblacion West

Barangay Poblacion West forms part of Rosario, a municipality in La Union, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Poblacion West had a population of 1,965. This made it the 14th largest of 33 barangays in Rosario by population, placing it in the middle tier of the municipality. Residents of Barangay Poblacion West accounted for approximately 3.26% of the total population of Rosario, which stood at 60,278 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Poblacion West moving from 1,867 residents to 1,965 residents, an intercensal change of +5.2%. The trajectory indicates a growing community. Barangay Poblacion West is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Rosario is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Poblacion 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 Poblacion West ranks 111th 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.