Barangay Santo Niño

Situated in San Agustin, Isabela, Barangay Santo Niño is one of 23 barangays that make up the municipality within Cagayan Valley.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Niño had a population of 1,631. This made it the 3rd largest of 23 barangays in San Agustin by population, placing it among the most populous barangays of the municipality. Residents of Barangay Santo Niño accounted for approximately 7.38% of the total population of San Agustin, which stood at 22,096 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Santo Niño moving from 1,480 residents to 1,631 residents, an intercensal change of +10.2%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Santo Niño as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Agustin is a municipality comprising 23 barangays, and serves as the governing unit directly responsible for local services in Barangay Santo Niño, 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 Santo Niño ranks 377th 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.

Like every Philippine barangay, Barangay Santo Niño is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.