Barangay Diaman

Barangay Diaman forms part of Maria Aurora, a municipality in Aurora, and is classified as a very small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Diaman had a population of 252. This made it the 39th largest of 40 barangays in Maria Aurora by population, placing it among the smaller barangays of the municipality. Residents of Barangay Diaman accounted for approximately 0.56% of the total population of Maria Aurora, which stood at 44,958 in the same census year.

The barangay recorded 257 residents in the 2015 intercensal count and 252 residents in the 2020 Census — a net change of -1.9%, consistent with a broadly stable settlement. The Philippine Statistics Authority classifies Barangay Diaman as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Maria Aurora is a municipality comprising 40 barangays, and serves as the governing unit directly responsible for local services in Barangay Diaman, including public health, sanitation, peace and order, and civil registration. Within the wider province of Aurora, which contains 151 barangays across its component cities and municipalities, Barangay Diaman ranks 148th by 2020 population. Aurora is classified as a 3rd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay Diaman is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.