Barangay Langca

Classified as a very small barangay, Barangay Langca is one of the administrative divisions of Diadi in Nueva Vizcaya, Cagayan Valley, Philippines.

According to the 2020 Philippine census, Barangay Langca had a population of 309. This made it the 19th largest of 19 barangays in Diadi by population, placing it among the smaller barangays of the municipality. Residents of Barangay Langca accounted for approximately 1.61% of the total population of Diadi, which stood at 19,236 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Langca moving from 259 residents to 309 residents, an intercensal change of +19.3%. The trajectory indicates a growing community. Barangay Langca is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Diadi is a municipality comprising 19 barangays, and serves as the governing unit directly responsible for local services in Barangay Langca, including public health, sanitation, peace and order, and civil registration. Within the wider province of Nueva Vizcaya, which contains 275 barangays across its component cities and municipalities, Barangay Langca ranks 269th by 2020 population. Nueva Vizcaya is classified as a 2nd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

Like every Philippine barangay, Barangay Langca 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.