Barangay Buenavista

Barangay Buenavista forms part of Castilla, a municipality in Sorsogon, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Buenavista had a population of 1,867. This made it the 12th largest of 34 barangays in Castilla by population, placing it in the middle tier of the municipality. Residents of Barangay Buenavista accounted for approximately 3.08% of the total population of Castilla, which stood at 60,635 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Buenavista moving from 1,856 residents to 1,867 residents, an intercensal change of +0.6%. The trajectory indicates a slowly expanding community. Barangay Buenavista 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 Buenavista, 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 Buenavista ranks 139th 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.