Barangay Diamantina

Classified as a small barangay, Barangay Diamantina is one of the administrative divisions of Aurora in Isabela, Cagayan Valley, Philippines.

According to the 2020 Philippine census, Barangay Diamantina had a population of 1,076. This made it the 15th largest of 33 barangays in Aurora by population, placing it in the middle tier of the municipality. Residents of Barangay Diamantina accounted for approximately 2.94% of the total population of Aurora, which stood at 36,621 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Diamantina changed from 976 to 1,076, a shift of +10.2% over the five-year period. This places the barangay among those with growing populations in Aurora. Barangay Diamantina is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Aurora is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Diamantina, 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 Diamantina ranks 609th 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 Diamantina 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.