Barangay San Isidro

Situated in City of Santiago, Isabela, Barangay San Isidro is one of 37 barangays that make up the city within Cagayan Valley.

According to the 2020 Philippine census, Barangay San Isidro had a population of 1,087. This made it the 35th largest of 37 barangays in City of Santiago by population, placing it among the smaller barangays of the city. Residents of Barangay San Isidro accounted for approximately 0.73% of the total population of City of Santiago, which stood at 148,580 in the same census year.

The barangay recorded 1,050 residents in the 2015 intercensal count and 1,087 residents in the 2020 Census — a net change of +3.5%, consistent with a growing 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.

City of Santiago is a city comprising 37 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 Isabela, which contains 1,055 barangays across its component cities and municipalities, Barangay San Isidro ranks 599th by 2020 population. Isabela 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.