Barangay Salinungan West

Situated in San Mateo, Isabela, Barangay Salinungan West is one of 33 barangays that make up the municipality within Cagayan Valley.

According to the 2020 Philippine census, Barangay Salinungan West had a population of 5,871. This made it the 1st largest of 33 barangays in San Mateo by population, placing it among the most populous barangays of the municipality. Residents of Barangay Salinungan West accounted for approximately 8.81% of the total population of San Mateo, which stood at 66,663 in the same census year.

The barangay recorded 5,450 residents in the 2015 intercensal count and 5,871 residents in the 2020 Census — a net change of +7.7%, consistent with a growing settlement. Barangay Salinungan West is officially classified as urban, reflecting the density and built-up character of the area.

San Mateo is a municipality comprising 33 barangays, and serves as the governing unit directly responsible for local services in Barangay Salinungan West, 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 Salinungan West ranks 22nd 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 Salinungan West 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.