Barangay District I (Pob.)

Situated in Reina Mercedes, Isabela, Barangay District I (Pob.) is one of 20 barangays that make up the municipality within Cagayan Valley.

According to the 2020 Philippine census, Barangay District I (Pob.) had a population of 1,241. This made it the 11th largest of 20 barangays in Reina Mercedes by population, placing it in the middle tier of the municipality. Residents of Barangay District I (Pob.) accounted for approximately 4.45% of the total population of Reina Mercedes, which stood at 27,900 in the same census year.

Census comparisons between 2015 and 2020 show Barangay District I (Pob.) moving from 1,378 residents to 1,241 residents, an intercensal change of -9.9%. The trajectory indicates a contracting community. Barangay District I (Pob.) is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Reina Mercedes is a municipality comprising 20 barangays, and serves as the governing unit directly responsible for local services in Barangay District I (Pob.), including public health, sanitation, peace and order, and civil registration. Within the wider province of Isabela, which contains 1,055 barangays across its component cities and municipalities, Barangay District I (Pob.) ranks 525th by 2020 population. Isabela is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay District I (Pob.) is governed by an elected Sangguniang Barangay composed of a Punong Barangay and seven kagawads, with the Sangguniang Kabataan representing the youth. The next BSKE, set for Monday, November 2, 2026, will elect officials to four-year terms as provided under Republic Act No. 12232.