Barangay Mabini

Barangay Mabini forms part of City of Santiago, a city in Isabela, and is classified as a large barangay.

According to the 2020 Philippine census, Barangay Mabini had a population of 7,286. This made it the 5th largest of 37 barangays in City of Santiago by population, placing it in the upper half of the city. Residents of Barangay Mabini accounted for approximately 4.90% of the total population of City of Santiago, which stood at 148,580 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Mabini changed from 6,223 to 7,286, a shift of +17.1% over the five-year period. This places the barangay among those with growing populations in City of Santiago. Barangay Mabini is officially classified as urban, reflecting the density and built-up character of the area.

City of Santiago is a city comprising 37 barangays, and serves as the governing unit directly responsible for local services in Barangay Mabini, 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 Mabini ranks 11th 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.

Barangay Mabini is governed by an elected Sangguniang Barangay composed of a Punong Barangay and seven kagawads, with the Sangguniang Kabataan representing the youth. The next BSKE, set for Monday, November 2, 2026, will elect officials to four-year terms as provided under Republic Act No. 12232.