Barangay Montes Kallagan

Barangay Montes Kallagan forms part of Atimonan, a municipality in Quezon, and is classified as a very small barangay.

According to the 2020 Philippine census, Barangay Montes Kallagan had a population of 247. This made it the 38th largest of 42 barangays in Atimonan by population, placing it among the smaller barangays of the municipality. Residents of Barangay Montes Kallagan accounted for approximately 0.38% of the total population of Atimonan, which stood at 64,260 in the same census year.

The barangay recorded 274 residents in the 2015 intercensal count and 247 residents in the 2020 Census — a net change of -9.9%, consistent with a contracting settlement. Barangay Montes Kallagan is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Atimonan is a municipality comprising 42 barangays, and serves as the governing unit directly responsible for local services in Barangay Montes Kallagan, 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 Montes Kallagan ranks 1138th 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.

Barangay Montes Kallagan is governed by an elected Sangguniang Barangay composed of a Punong Barangay and seven kagawads, with the Sangguniang Kabataan representing the youth. The next BSKE, set for Monday, November 2, 2026, will elect officials to four-year terms as provided under Republic Act No. 12232.