Barangay San Manuel

Barangay San Manuel forms part of Naguilian, a municipality in Isabela, and is classified as a mid-sized barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Manuel had a population of 2,590. This made it the 4th largest of 25 barangays in Naguilian by population, placing it in the upper half of the municipality. Residents of Barangay San Manuel accounted for approximately 7.67% of the total population of Naguilian, which stood at 33,788 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Manuel moving from 2,300 residents to 2,590 residents, an intercensal change of +12.6%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay San Manuel as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Naguilian is a municipality comprising 25 barangays, and serves as the governing unit directly responsible for local services in Barangay San Manuel, 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 San Manuel ranks 145th 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 San Manuel 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.