Barangay San Eugenio (Pob.)

Barangay San Eugenio (Pob.) forms part of San Nicolas, a municipality in Ilocos Norte, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Eugenio (Pob.) had a population of 1,021. This made it the 18th largest of 24 barangays in San Nicolas by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Eugenio (Pob.) accounted for approximately 2.63% of the total population of San Nicolas, which stood at 38,895 in the same census year.

Census comparisons between 2015 and 2020 show Barangay San Eugenio (Pob.) moving from 1,075 residents to 1,021 residents, an intercensal change of -5.0%. The trajectory indicates a contracting community. Barangay San Eugenio (Pob.) is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Nicolas is a municipality comprising 24 barangays, and serves as the governing unit directly responsible for local services in Barangay San Eugenio (Pob.), 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 San Eugenio (Pob.) ranks 263rd 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.

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.