Barangay Luna (Pob.)

Barangay Luna (Pob.) is a mid-sized barangay in the municipality of San Antonio, located in the province of Zambales, in the Central Luzon region of the Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Luna (Pob.) had a population of 2,675. This made it the 7th largest of 14 barangays in San Antonio by population, placing it in the middle tier of the municipality. Residents of Barangay Luna (Pob.) accounted for approximately 7.14% of the total population of San Antonio, which stood at 37,450 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Luna (Pob.) moving from 2,792 residents to 2,675 residents, an intercensal change of -4.2%. The trajectory indicates a contracting community. The Philippine Statistics Authority classifies Barangay Luna (Pob.) as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Antonio is a municipality comprising 14 barangays, and serves as the governing unit directly responsible for local services in Barangay Luna (Pob.), including public health, sanitation, peace and order, and civil registration. Within the wider province of Zambales, which contains 247 barangays across its component cities and municipalities, Barangay Luna (Pob.) ranks 78th by 2020 population. Zambales 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.