Barangay Kalilayan Ibaba

Barangay Kalilayan Ibaba forms part of Unisan, a municipality in Quezon, and is classified as a mid-sized barangay.

According to the 2020 Philippine census, Barangay Kalilayan Ibaba had a population of 2,727. This made it the 1st largest of 36 barangays in Unisan by population, placing it among the most populous barangays of the municipality. Residents of Barangay Kalilayan Ibaba accounted for approximately 10.72% of the total population of Unisan, which stood at 25,448 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Kalilayan Ibaba changed from 2,675 to 2,727, a shift of +1.9% over the five-year period. This places the barangay among those with slowly expanding populations in Unisan. Barangay Kalilayan Ibaba is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Unisan is a municipality comprising 36 barangays, and serves as the governing unit directly responsible for local services in Barangay Kalilayan Ibaba, 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 Kalilayan Ibaba ranks 199th 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.