Barangay San Isidro

Classified as a small barangay, Barangay San Isidro is one of the administrative divisions of San Narciso in Quezon, CALABARZON, Philippines.

According to the 2020 Philippine census, Barangay San Isidro had a population of 1,179. This made it the 22nd largest of 24 barangays in San Narciso by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Isidro accounted for approximately 2.31% of the total population of San Narciso, which stood at 51,058 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay San Isidro changed from 1,305 to 1,179, a shift of -9.7% over the five-year period. This places the barangay among those with contracting populations in San Narciso. Barangay San Isidro is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Narciso is a municipality comprising 24 barangays, and serves as the governing unit directly responsible for local services in Barangay San Isidro, including public health, sanitation, peace and order, and civil registration. Within the wider province of Quezon, which contains 1,242 barangays across its component cities and municipalities, Barangay San Isidro ranks 517th by 2020 population. Quezon 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.