Barangay Allinguigan 1st

Classified as a small barangay, Barangay Allinguigan 1st is one of the administrative divisions of City of Ilagan in Isabela, Cagayan Valley, Philippines.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Allinguigan 1st had a population of 1,909. This made it the 25th largest of 91 barangays in City of Ilagan by population, placing it in the upper half of the city. Residents of Barangay Allinguigan 1st accounted for approximately 1.21% of the total population of City of Ilagan, which stood at 158,218 in the same census year.

The barangay recorded 1,896 residents in the 2015 intercensal count and 1,909 residents in the 2020 Census — a net change of +0.7%, consistent with a slowly expanding settlement. The Philippine Statistics Authority classifies Barangay Allinguigan 1st as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

City of Ilagan is a city comprising 91 barangays, and serves as the governing unit directly responsible for local services in Barangay Allinguigan 1st, including public health, sanitation, peace and order, and civil registration. Within the wider province of Isabela, which contains 1,055 barangays across its component cities and municipalities, Barangay Allinguigan 1st ranks 289th by 2020 population. Isabela 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 Allinguigan 1st 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.