Barangay Bio-os

Classified as a mid-sized barangay, Barangay Bio-os is one of the administrative divisions of Amlan in Negros Oriental, Central Visayas, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Bio-os had a population of 4,106. This made it the 3rd largest of 8 barangays in Amlan by population, placing it in the upper half of the municipality. Residents of Barangay Bio-os accounted for approximately 16.09% of the total population of Amlan, which stood at 25,513 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Bio-os moving from 3,639 residents to 4,106 residents, an intercensal change of +12.8%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Bio-os as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Amlan is a municipality comprising 8 barangays, and serves as the governing unit directly responsible for local services in Barangay Bio-os, including public health, sanitation, peace and order, and civil registration. Within the wider province of Negros Oriental, which contains 557 barangays across its component cities and municipalities, Barangay Bio-os ranks 94th by 2020 population. Negros Oriental is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Bio-os 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.