Barangay San Gregorio

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

According to the 2020 Philippine census, Barangay San Gregorio had a population of 600. This made it the 18th largest of 22 barangays in Luna by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Gregorio accounted for approximately 2.82% 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 San Gregorio changed from 548 to 600, a shift of +9.5% over the five-year period. This places the barangay among those with growing populations in Luna. Barangay San Gregorio is officially classified 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 San Gregorio, 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 San Gregorio ranks 88th 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.