Barangay Tanza

Situated in Boac, Marinduque, Barangay Tanza is one of 61 barangays that make up the municipality within MIMAROPA Region.

According to the 2020 Philippine census, Barangay Tanza had a population of 1,997. This made it the 5th largest of 61 barangays in Boac by population, placing it among the most populous barangays of the municipality. Residents of Barangay Tanza accounted for approximately 3.49% of the total population of Boac, which stood at 57,283 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Tanza changed from 1,810 to 1,997, a shift of +10.3% over the five-year period. This places the barangay among those with growing populations in Boac. Barangay Tanza is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Boac is a municipality comprising 61 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 Marinduque, which contains 218 barangays across its component cities and municipalities, Barangay Tanza ranks 25th by 2020 population. Marinduque is classified as a 4th 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.