Barangay Nag-Iba

Situated in Mabini, Batangas, Barangay Nag-Iba is one of 34 barangays that make up the municipality within CALABARZON.

According to the 2020 Philippine census, Barangay Nag-Iba had a population of 1,056. This made it the 24th largest of 34 barangays in Mabini by population, placing it in the middle tier of the municipality. Residents of Barangay Nag-Iba accounted for approximately 2.08% of the total population of Mabini, which stood at 50,858 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Nag-Iba changed from 886 to 1,056, a shift of +19.2% over the five-year period. This places the barangay among those with growing populations in Mabini. Barangay Nag-Iba is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Mabini is a municipality comprising 34 barangays, and serves as the governing unit directly responsible for local services in Barangay Nag-Iba, including public health, sanitation, peace and order, and civil registration. Within the wider province of Batangas, which contains 1,078 barangays across its component cities and municipalities, Barangay Nag-Iba ranks 850th by 2020 population. Batangas is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay Nag-Iba 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.