Barangay San Isidro

Barangay San Isidro forms part of Matuguinao, a municipality in Samar, and is classified as a very small barangay.

According to the 2020 Philippine census, Barangay San Isidro had a population of 254. This made it the 9th largest of 20 barangays in Matuguinao by population, placing it in the middle tier of the municipality. Residents of Barangay San Isidro accounted for approximately 3.45% of the total population of Matuguinao, which stood at 7,364 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay San Isidro changed from 277 to 254, a shift of -8.3% over the five-year period. This places the barangay among those with contracting populations in Matuguinao. Barangay San Isidro is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Matuguinao is a municipality comprising 20 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 Samar, which contains 951 barangays across its component cities and municipalities, Barangay San Isidro ranks 797th by 2020 population. Samar 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.