Barangay San Mariano

Classified as a small barangay, Barangay San Mariano is one of the administrative divisions of Peñaranda in Nueva Ecija, Central Luzon, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Mariano had a population of 1,112. This made it the 10th largest of 10 barangays in Peñaranda by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Mariano accounted for approximately 3.45% of the total population of Peñaranda, which stood at 32,269 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Mariano moving from 847 residents to 1,112 residents, an intercensal change of +31.3%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay San Mariano as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Peñaranda is a municipality comprising 10 barangays, and serves as the governing unit directly responsible for local services in Barangay San Mariano, including public health, sanitation, peace and order, and civil registration. Within the wider province of Nueva Ecija, which contains 849 barangays across its component cities and municipalities, Barangay San Mariano ranks 692nd by 2020 population. Nueva Ecija 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.