Barangay Fugu Sur

Barangay Fugu Sur forms part of Tumauini, a municipality in Isabela, and is classified as a very small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Fugu Sur had a population of 169. This made it the 45th largest of 46 barangays in Tumauini by population, placing it among the smaller barangays of the municipality. Residents of Barangay Fugu Sur accounted for approximately 0.24% of the total population of Tumauini, which stood at 70,743 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Fugu Sur moving from 156 residents to 169 residents, an intercensal change of +8.3%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Fugu Sur as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Tumauini is a municipality comprising 46 barangays, and serves as the governing unit directly responsible for local services in Barangay Fugu Sur, 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 Fugu Sur ranks 1049th 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 Fugu Sur 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.