Barangay Nag-Iba I

Barangay Nag-Iba I forms part of Naujan, a municipality in Oriental Mindoro, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Nag-Iba I had a population of 843. This made it the 57th largest of 70 barangays in Naujan by population, placing it among the smaller barangays of the municipality. Residents of Barangay Nag-Iba I accounted for approximately 0.77% of the total population of Naujan, which stood at 109,587 in the same census year.

The barangay recorded 894 residents in the 2015 intercensal count and 843 residents in the 2020 Census — a net change of -5.7%, consistent with a contracting settlement. The Philippine Statistics Authority classifies Barangay Nag-Iba I as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Naujan is a municipality comprising 70 barangays, and serves as the governing unit directly responsible for local services in Barangay Nag-Iba I, including public health, sanitation, peace and order, and civil registration. Within the wider province of Oriental Mindoro, which contains 426 barangays across its component cities and municipalities, Barangay Nag-Iba I ranks 376th by 2020 population. Oriental Mindoro is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Nag-Iba 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.