Barangay Marabulig I

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

According to the 2020 Philippine census, Barangay Marabulig I had a population of 4,542. This made it the 7th largest of 65 barangays in City of Cauayan by population, placing it among the most populous barangays of the city. Residents of Barangay Marabulig I accounted for approximately 3.17% 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 Marabulig I moving from 3,993 residents to 4,542 residents, an intercensal change of +13.7%. The trajectory indicates a growing community. Barangay Marabulig I 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 Marabulig I, 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 Marabulig I ranks 40th 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 Marabulig I 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.