Barangay Ilosong

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

According to the 2020 Philippine census, Barangay Ilosong had a population of 1,101. This made it the 4th largest of 9 barangays in Plaridel by population, placing it in the middle tier of the municipality. Residents of Barangay Ilosong accounted for approximately 10.87% of the total population of Plaridel, which stood at 10,129 in the same census year.

The barangay recorded 1,243 residents in the 2015 intercensal count and 1,101 residents in the 2020 Census — a net change of -11.4%, consistent with a contracting settlement. Barangay Ilosong is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Plaridel is a municipality comprising 9 barangays, and serves as the governing unit directly responsible for local services in Barangay Ilosong, 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 Ilosong ranks 555th 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 Ilosong 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.