Barangay Nungnungan I

Barangay Nungnungan I forms part of City of Cauayan, a city in Isabela, and is classified as a mid-sized barangay.

According to the 2020 Philippine census, Barangay Nungnungan I had a population of 2,283. This made it the 22nd largest of 65 barangays in City of Cauayan by population, placing it in the middle tier of the city. Residents of Barangay Nungnungan I accounted for approximately 1.59% 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 Nungnungan I moving from 1,989 residents to 2,283 residents, an intercensal change of +14.8%. The trajectory indicates a growing community. Barangay Nungnungan 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 Nungnungan 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 Nungnungan I ranks 208th 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 Nungnungan 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.