Barangay Tanza

Barangay Tanza forms part of Estancia, a municipality in Iloilo, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay Tanza had a population of 1,413. This made it the 16th largest of 25 barangays in Estancia by population, placing it in the middle tier of the municipality. Residents of Barangay Tanza accounted for approximately 2.66% of the total population of Estancia, which stood at 53,200 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Tanza moving from 1,592 residents to 1,413 residents, an intercensal change of -11.2%. The trajectory indicates a contracting community. Barangay Tanza is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Estancia is a municipality comprising 25 barangays, and serves as the governing unit directly responsible for local services in Barangay Tanza, including public health, sanitation, peace and order, and civil registration. Within the wider province of Iloilo, which contains 1,901 barangays across its component cities and municipalities, Barangay Tanza ranks 498th by 2020 population. Iloilo 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 Tanza 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.