Barangay San Isidro

Classified as a small barangay, Barangay San Isidro is one of the administrative divisions of Olutanga in Zamboanga Sibugay, Zamboanga Peninsula, Philippines.

According to the 2020 Philippine census, Barangay San Isidro had a population of 856. This made it the 19th largest of 19 barangays in Olutanga by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Isidro accounted for approximately 2.23% of the total population of Olutanga, which stood at 38,438 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Isidro moving from 818 residents to 856 residents, an intercensal change of +4.6%. The trajectory indicates a growing community. Barangay San Isidro is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Olutanga is a municipality comprising 19 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 Zamboanga Sibugay, which contains 389 barangays across its component cities and municipalities, Barangay San Isidro ranks 295th by 2020 population. Zamboanga Sibugay 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 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.