Barangay La Union

Situated in Castilla, Sorsogon, Barangay La Union is one of 34 barangays that make up the municipality within Bicol Region.

According to the 2020 Philippine census, Barangay La Union had a population of 1,272. This made it the 19th largest of 34 barangays in Castilla by population, placing it in the middle tier of the municipality. Residents of Barangay La Union accounted for approximately 2.10% of the total population of Castilla, which stood at 60,635 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay La Union changed from 1,263 to 1,272, a shift of +0.7% over the five-year period. This places the barangay among those with slowly expanding populations in Castilla. Barangay La Union is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Castilla is a municipality comprising 34 barangays, and serves as the governing unit directly responsible for local services in Barangay La Union, including public health, sanitation, peace and order, and civil registration. Within the wider province of Sorsogon, which contains 541 barangays across its component cities and municipalities, Barangay La Union ranks 248th by 2020 population. Sorsogon is classified as a 2nd 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.