Barangay Annafunan

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

According to the 2020 Philippine census, Barangay Annafunan had a population of 2,021. This made it the 12th largest of 46 barangays in Tumauini by population, placing it in the upper half of the municipality. Residents of Barangay Annafunan accounted for approximately 2.86% of the total population of Tumauini, which stood at 70,743 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Annafunan changed from 1,754 to 2,021, a shift of +15.2% over the five-year period. This places the barangay among those with growing populations in Tumauini. Barangay Annafunan is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Tumauini is a municipality comprising 46 barangays, and serves as the governing unit directly responsible for local services in Barangay Annafunan, 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 Annafunan ranks 263rd 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 Annafunan 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.