Barangay Dulong Bayan 1

Classified as a large barangay, Barangay Dulong Bayan 1 is one of the administrative divisions of San Mateo in Rizal, CALABARZON, Philippines.

According to the 2020 Philippine census, Barangay Dulong Bayan 1 had a population of 5,229. This made it the 14th largest of 15 barangays in San Mateo by population, placing it among the smaller barangays of the municipality. Residents of Barangay Dulong Bayan 1 accounted for approximately 1.91% of the total population of San Mateo, which stood at 273,306 in the same census year.

Between the 2015 and 2020 censuses, the population of Barangay Dulong Bayan 1 changed from 6,944 to 5,229, a shift of -24.7% over the five-year period. This places the barangay among those with contracting populations in San Mateo. Barangay Dulong Bayan 1 is officially classified as urban, reflecting the density and built-up character of the area.

San Mateo is a municipality comprising 15 barangays, and serves as the governing unit directly responsible for local services in Barangay Dulong Bayan 1, including public health, sanitation, peace and order, and civil registration. Within the wider province of Rizal, which contains 189 barangays across its component cities and municipalities, Barangay Dulong Bayan 1 ranks 102nd by 2020 population. Rizal 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 Dulong Bayan 1 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.