Barangay Cadumanian

Classified as a small barangay, Barangay Cadumanian is one of the administrative divisions of Rosario in La Union, Ilocos Region, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Cadumanian had a population of 1,172. This made it the 24th largest of 33 barangays in Rosario by population, placing it in the middle tier of the municipality. Residents of Barangay Cadumanian accounted for approximately 1.94% of the total population of Rosario, which stood at 60,278 in the same census year.

The barangay recorded 1,019 residents in the 2015 intercensal count and 1,172 residents in the 2020 Census — a net change of +15.0%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay Cadumanian as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Rosario is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Cadumanian, including public health, sanitation, peace and order, and civil registration. Within the wider province of La Union, which contains 576 barangays across its component cities and municipalities, Barangay Cadumanian ranks 284th by 2020 population. La Union is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay Cadumanian 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.