Barangay San Isidro

Situated in Guinayangan, Quezon, Barangay San Isidro is one of 54 barangays that make up the municipality within CALABARZON.

According to the 2020 Philippine census, Barangay San Isidro had a population of 869. This made it the 16th largest of 54 barangays in Guinayangan by population, placing it in the upper half of the municipality. Residents of Barangay San Isidro accounted for approximately 1.97% of the total population of Guinayangan, which stood at 44,045 in the same census year.

The barangay recorded 867 residents in the 2015 intercensal count and 869 residents in the 2020 Census — a net change of +0.2%, consistent with a slowly expanding settlement. Barangay San Isidro is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Guinayangan is a municipality comprising 54 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 675th 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.

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.