Barangay Santa Monica

Barangay Santa Monica forms part of Echague, a municipality in Isabela, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Santa Monica had a population of 1,133. This made it the 36th largest of 64 barangays in Echague by population, placing it in the middle tier of the municipality. Residents of Barangay Santa Monica accounted for approximately 1.28% of the total population of Echague, which stood at 88,410 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Santa Monica changed from 948 to 1,133, a shift of +19.5% over the five-year period. This places the barangay among those with growing populations in Echague. The Philippine Statistics Authority classifies Barangay Santa Monica as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Echague is a municipality comprising 64 barangays, and serves as the governing unit directly responsible for local services in Barangay Santa Monica, 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 Santa Monica ranks 571st 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.

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.