Barangay San Isidro (Pob.)

Barangay San Isidro (Pob.) is a mid-sized barangay in the municipality of San Marcelino, located in the province of Zambales, in the Central Luzon region of the Philippines.

According to the 2020 Philippine census, Barangay San Isidro (Pob.) had a population of 2,095. This made it the 10th largest of 18 barangays in San Marcelino by population, placing it in the middle tier of the municipality. Residents of Barangay San Isidro (Pob.) accounted for approximately 5.55% of the total population of San Marcelino, which stood at 37,719 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Isidro (Pob.) moving from 1,931 residents to 2,095 residents, an intercensal change of +8.5%. The trajectory indicates a growing community. Barangay San Isidro (Pob.) is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Marcelino is a municipality comprising 18 barangays, and serves as the governing unit directly responsible for local services in Barangay San Isidro (Pob.), including public health, sanitation, peace and order, and civil registration. Within the wider province of Zambales, which contains 247 barangays across its component cities and municipalities, Barangay San Isidro (Pob.) ranks 107th by 2020 population. Zambales is classified as a 2nd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay San Isidro (Pob.) 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.