Barangay Ba-i

Barangay Ba-i forms part of Lagayan, a municipality in Abra, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Ba-i had a population of 731. This made it the 4th largest of 5 barangays in Lagayan by population, placing it in the middle tier of the municipality. Residents of Barangay Ba-i accounted for approximately 16.29% of the total population of Lagayan, which stood at 4,488 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Ba-i changed from 839 to 731, a shift of -12.9% over the five-year period. This places the barangay among those with contracting populations in Lagayan. Barangay Ba-i is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Lagayan is a municipality comprising 5 barangays, and serves as the governing unit directly responsible for local services in Barangay Ba-i, including public health, sanitation, peace and order, and civil registration. Within the wider province of Abra, which contains 303 barangays across its component cities and municipalities, Barangay Ba-i ranks 135th by 2020 population. Abra 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.