Barangay Mabanengbeng 1st

Barangay Mabanengbeng 1st is a very small barangay in the municipality of Bacnotan, located in the province of La Union, in the Ilocos Region region of the Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Mabanengbeng 1st had a population of 332. This made it the 45th largest of 47 barangays in Bacnotan by population, placing it among the smaller barangays of the municipality. Residents of Barangay Mabanengbeng 1st accounted for approximately 0.75% of the total population of Bacnotan, which stood at 44,388 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Mabanengbeng 1st moving from 351 residents to 332 residents, an intercensal change of -5.4%. The trajectory indicates a contracting community. The Philippine Statistics Authority classifies Barangay Mabanengbeng 1st as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Bacnotan is a municipality comprising 47 barangays, and serves as the governing unit directly responsible for local services in Barangay Mabanengbeng 1st, including public health, sanitation, peace and order, and civil registration. Within the wider province of La Union, which contains 576 barangays across its component cities and municipalities, Barangay Mabanengbeng 1st ranks 570th by 2020 population. La Union 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.