Barangay Nagrumbuan

Classified as a mid-sized barangay, Barangay Nagrumbuan is one of the administrative divisions of City of Cauayan in Isabela, Cagayan Valley, Philippines.

According to the 2020 Philippine census, Barangay Nagrumbuan had a population of 4,032. This made it the 8th largest of 65 barangays in City of Cauayan by population, placing it in the upper half of the city. Residents of Barangay Nagrumbuan accounted for approximately 2.81% of the total population of City of Cauayan, which stood at 143,403 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Nagrumbuan moving from 3,693 residents to 4,032 residents, an intercensal change of +9.2%. The trajectory indicates a growing community. Barangay Nagrumbuan is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

City of Cauayan is a city comprising 65 barangays, and serves as the governing unit directly responsible for local services in Barangay Nagrumbuan, 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 Nagrumbuan ranks 51st 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 Nagrumbuan 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.