Barangay San Isidro

Classified as a mid-sized barangay, Barangay San Isidro is one of the administrative divisions of Rosario in Batangas, CALABARZON, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Isidro had a population of 4,106. This made it the 9th largest of 48 barangays in Rosario by population, placing it in the upper half of the municipality. Residents of Barangay San Isidro accounted for approximately 3.20% of the total population of Rosario, which stood at 128,352 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Isidro moving from 3,811 residents to 4,106 residents, an intercensal change of +7.7%. The trajectory indicates a growing community. 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.

Rosario is a municipality comprising 48 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 Batangas, which contains 1,078 barangays across its component cities and municipalities, Barangay San Isidro ranks 172nd by 2020 population. Batangas is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay San Isidro is governed by an elected Sangguniang Barangay composed of a Punong Barangay and seven kagawads, with the Sangguniang Kabataan representing the youth. The next BSKE, set for Monday, November 2, 2026, will elect officials to four-year terms as provided under Republic Act No. 12232.