Barangay Inabaan Sur

Barangay Inabaan Sur is a small barangay in the municipality of Rosario, located in the province of La Union, in the Ilocos Region region of the Philippines.

According to the 2020 Philippine census, Barangay Inabaan Sur had a population of 1,477. This made it the 22nd largest of 33 barangays in Rosario by population, placing it in the middle tier of the municipality. Residents of Barangay Inabaan Sur accounted for approximately 2.45% of the total population of Rosario, which stood at 60,278 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Inabaan Sur moving from 1,481 residents to 1,477 residents, an intercensal change of -0.3%. The trajectory indicates a broadly stable community. Barangay Inabaan Sur is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Rosario is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Inabaan Sur, including public health, sanitation, peace and order, and civil registration. Within the wider province of La Union, which contains 576 barangays across its component cities and municipalities, Barangay Inabaan Sur ranks 200th by 2020 population. La Union 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 Inabaan 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.