Barangay Amilongan

Situated in Alilem, Ilocos Sur, Barangay Amilongan is one of 9 barangays that make up the municipality within Ilocos Region.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Amilongan had a population of 624. This made it the 5th largest of 9 barangays in Alilem by population, placing it in the middle tier of the municipality. Residents of Barangay Amilongan accounted for approximately 8.48% of the total population of Alilem, which stood at 7,361 in the same census year.

The barangay recorded 520 residents in the 2015 intercensal count and 624 residents in the 2020 Census — a net change of +20.0%, consistent with a growing settlement. The Philippine Statistics Authority classifies Barangay Amilongan as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Alilem is a municipality comprising 9 barangays, and serves as the governing unit directly responsible for local services in Barangay Amilongan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Ilocos Sur, which contains 768 barangays across its component cities and municipalities, Barangay Amilongan ranks 488th by 2020 population. Ilocos Sur is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Barangay Amilongan 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.