Barangay Bianuan

Classified as a mid-sized barangay, Barangay Bianuan is one of the administrative divisions of Casiguran in Aurora, Central Luzon, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Bianuan had a population of 3,770. This made it the 1st largest of 24 barangays in Casiguran by population, placing it among the most populous barangays of the municipality. Residents of Barangay Bianuan accounted for approximately 14.19% of the total population of Casiguran, which stood at 26,564 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Bianuan moving from 3,443 residents to 3,770 residents, an intercensal change of +9.5%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Bianuan as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Casiguran is a municipality comprising 24 barangays, and serves as the governing unit directly responsible for local services in Barangay Bianuan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Aurora, which contains 151 barangays across its component cities and municipalities, Barangay Bianuan ranks 14th by 2020 population. Aurora is classified as a 3rd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay Bianuan 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.