Barangay Madlangdungan

Barangay Madlangdungan forms part of Calauag, a municipality in Quezon, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Madlangdungan had a population of 770. This made it the 36th largest of 81 barangays in Calauag by population, placing it in the middle tier of the municipality. Residents of Barangay Madlangdungan accounted for approximately 1.07% of the total population of Calauag, which stood at 71,809 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Madlangdungan moving from 805 residents to 770 residents, an intercensal change of -4.3%. The trajectory indicates a contracting community. The Philippine Statistics Authority classifies Barangay Madlangdungan as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Calauag is a municipality comprising 81 barangays, and serves as the governing unit directly responsible for local services in Barangay Madlangdungan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Quezon, which contains 1,242 barangays across its component cities and municipalities, Barangay Madlangdungan ranks 741st by 2020 population. Quezon is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.