Barangay Naguillan

Barangay Naguillan forms part of Nueva Era, a municipality in Ilocos Norte, and is classified as a small barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Naguillan had a population of 1,043. This made it the 5th largest of 11 barangays in Nueva Era by population, placing it in the middle tier of the municipality. Residents of Barangay Naguillan accounted for approximately 8.71% of the total population of Nueva Era, which stood at 11,968 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Naguillan moving from 888 residents to 1,043 residents, an intercensal change of +17.5%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Naguillan as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Nueva Era is a municipality comprising 11 barangays, and serves as the governing unit directly responsible for local services in Barangay Naguillan, including public health, sanitation, peace and order, and civil registration. Within the wider province of Ilocos Norte, which contains 559 barangays across its component cities and municipalities, Barangay Naguillan ranks 250th by 2020 population. Ilocos Norte is classified as a 1st by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay Naguillan is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.