Barangay San Isidro

Barangay San Isidro forms part of Bantay, a municipality in Ilocos Sur, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Isidro had a population of 983. This made it the 14th largest of 34 barangays in Bantay by population, placing it in the middle tier of the municipality. Residents of Barangay San Isidro accounted for approximately 2.65% of the total population of Bantay, which stood at 37,118 in the same census year.

The barangay recorded 841 residents in the 2015 intercensal count and 983 residents in the 2020 Census — a net change of +16.9%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay San Isidro as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Bantay is a municipality comprising 34 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 Ilocos Sur, which contains 768 barangays across its component cities and municipalities, Barangay San Isidro ranks 259th by 2020 population. Ilocos Sur 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.