Barangay Santo Domingo

Barangay Santo Domingo forms part of Cainta, a municipality in Rizal, and is classified as a mega-barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santo Domingo had a population of 47,245. This made it the 4th largest of 7 barangays in Cainta by population, placing it in the middle tier of the municipality. Residents of Barangay Santo Domingo accounted for approximately 12.53% of the total population of Cainta, which stood at 376,933 in the same census year.

The barangay recorded 41,507 residents in the 2015 intercensal count and 47,245 residents in the 2020 Census — a net change of +13.8%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay Santo Domingo as urban, reflecting the density and built-up character of the area.

Cainta is a municipality comprising 7 barangays, and serves as the governing unit directly responsible for local services in Barangay Santo Domingo, 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 Domingo ranks 23rd 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.

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.