Barangay Bio

Situated in Tagudin, Ilocos Sur, Barangay Bio is one of 43 barangays that make up the municipality within Ilocos Region.

According to the 2020 Philippine census, Barangay Bio had a population of 1,122. This made it the 11th largest of 43 barangays in Tagudin by population, placing it in the upper half of the municipality. Residents of Barangay Bio accounted for approximately 2.70% of the total population of Tagudin, which stood at 41,538 in the same census year.

The barangay recorded 1,008 residents in the 2015 intercensal count and 1,122 residents in the 2020 Census — a net change of +11.3%, consistent with a growing settlement. Barangay Bio is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Tagudin is a municipality comprising 43 barangays, and serves as the governing unit directly responsible for local services in Barangay Bio, including public health, sanitation, peace and order, and civil registration. Within the wider province of Ilocos Sur, which contains 768 barangays across its component cities and municipalities, Barangay Bio ranks 209th by 2020 population. Ilocos Sur is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Bio 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.