Barangay Union

Barangay Union is a small barangay in the municipality of Gamu, located in the province of Isabela, in the Cagayan Valley region of the Philippines.

According to the 2020 Philippine census, Barangay Union had a population of 1,204. This made it the 10th largest of 16 barangays in Gamu by population, placing it in the middle tier of the municipality. Residents of Barangay Union accounted for approximately 3.93% of the total population of Gamu, which stood at 30,655 in the same census year.

The barangay recorded 1,065 residents in the 2015 intercensal count and 1,204 residents in the 2020 Census — a net change of +13.1%, consistent with a growing settlement. Barangay Union is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Gamu is a municipality comprising 16 barangays, and serves as the governing unit directly responsible for local services in Barangay Union, including public health, sanitation, peace and order, and civil registration. Within the wider province of Isabela, which contains 1,055 barangays across its component cities and municipalities, Barangay Union ranks 540th by 2020 population. Isabela is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Union 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.