Barangay Oluangan

Barangay Oluangan forms part of Leon, a municipality in Iloilo, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Oluangan had a population of 645. This made it the 22nd largest of 85 barangays in Leon by population, placing it in the upper half of the municipality. Residents of Barangay Oluangan accounted for approximately 1.24% of the total population of Leon, which stood at 51,990 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Oluangan moving from 782 residents to 645 residents, an intercensal change of -17.5%. The trajectory indicates a contracting community. Barangay Oluangan is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Leon is a municipality comprising 85 barangays, and serves as the governing unit directly responsible for local services in Barangay Oluangan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Iloilo, which contains 1,901 barangays across its component cities and municipalities, Barangay Oluangan ranks 1124th by 2020 population. Iloilo is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Oluangan 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.