Barangay Mansiwat

Barangay Mansiwat is a very small barangay in the municipality of Boac, located in the province of Marinduque, in the MIMAROPA Region region of the Philippines.

According to the 2020 Philippine census, Barangay Mansiwat had a population of 421. This made it the 48th largest of 61 barangays in Boac by population, placing it among the smaller barangays of the municipality. Residents of Barangay Mansiwat accounted for approximately 0.73% of the total population of Boac, which stood at 57,283 in the same census year.

The barangay recorded 385 residents in the 2015 intercensal count and 421 residents in the 2020 Census — a net change of +9.4%, consistent with a growing settlement. Barangay Mansiwat 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 Mansiwat, 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 Mansiwat ranks 186th 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 Mansiwat 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.