Barangay San Isidro

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

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay San Isidro had a population of 245. This made it the 81st largest of 95 barangays in Lopez by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Isidro accounted for approximately 0.26% of the total population of Lopez, which stood at 94,657 in the same census year.

The barangay recorded 396 residents in the 2015 intercensal count and 245 residents in the 2020 Census — a net change of -38.1%, consistent with a contracting 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.

Lopez is a municipality comprising 95 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 1140th 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.

Like every Philippine barangay, Barangay San Isidro is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.