Barangay Santo Niño

Situated in San Mateo, Rizal, Barangay Santo Niño is one of 15 barangays that make up the municipality within CALABARZON.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Niño had a population of 12,769. This made it the 10th largest of 15 barangays in San Mateo by population, placing it in the middle tier of the municipality. Residents of Barangay Santo Niño accounted for approximately 4.67% of the total population of San Mateo, which stood at 273,306 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Santo Niño moving from 11,402 residents to 12,769 residents, an intercensal change of +12.0%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Santo Niño as urban, reflecting the density and built-up character of the area.

San Mateo is a municipality comprising 15 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 Rizal, which contains 189 barangays across its component cities and municipalities, Barangay Santo Niño ranks 60th by 2020 population. Rizal 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.