Barangay Santa Lina

Situated in Luna, Apayao, Barangay Santa Lina is one of 22 barangays that make up the municipality within CAR.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santa Lina had a population of 1,153. This made it the 7th largest of 22 barangays in Luna by population, placing it in the upper half of the municipality. Residents of Barangay Santa Lina accounted for approximately 5.41% of the total population of Luna, which stood at 21,297 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Santa Lina changed from 1,166 to 1,153, a shift of -1.1% over the five-year period. This places the barangay among those with broadly stable populations in Luna. The Philippine Statistics Authority classifies Barangay Santa Lina as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Luna is a municipality comprising 22 barangays, and serves as the governing unit directly responsible for local services in Barangay Santa Lina, including public health, sanitation, peace and order, and civil registration. Within the wider province of Apayao, which contains 133 barangays across its component cities and municipalities, Barangay Santa Lina ranks 35th by 2020 population. Apayao is classified as a 3rd 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.