[3] The name Dupax came from the Isinay word "dopaj" which means "to lie down in complete relaxation and rest",[5][6] the thing the natives wanted to do, upon repairing their camp and eating their catch, after hunting in the forest and before going homes.

[6][7] Prior to the establishment of Dupax, the site of what would be its town proper served as a camp for hunters from surrounding tribal settlements.

[6] Mala-ats, original settlers found by the Spanish colonizers in Dupax, are said to be ancestors of the Isinais who now inhabit the locality.

They were forced to migrate to the hinterlands as ethnic groups from other provinces, especially the Ilocanos, Igorots, lfugaos, arrived before and after the turn of the century.

[citation needed] As early as 1928, during the term of mayor Inocencio Suson, attempts were made to transfer the seat to Barrio Malasin.

[12] The creation of this municipality was ratified in a plebiscite held on November 8, 1971;[11] the division was implemented through Presidential Decree No.

The parish church, under the advocation of Saint Vincent Ferrer, is under the jurisdiction of the Roman Catholic Diocese of Bayombong.

The current façade, which mimics the silhouette of the earlier Tuguegarao Cathedral and is reflected on the churches of Bayombong and Bambang in Nueva Vizcaya, dates back to 1776 while each level of the bell tower bears inscription of the years when which it must have been completed.

Its original titular patron is the Nuestra Señora del Socorro but was replaced by San Vicente Ferrer soon after the mission was returned to the Dominicans.

The triangular pediment is divided into two horizontal sections with the lower half pierced with a deeply recessed oculus and the upper part featuring a relief of a cross.

The Dupax del Sur church is an officially declared National Cultural Treasure of the Philippines.

In 2015, the Dampol Bridge was also declared as a National Cultural Treasure, where both heritage sites were collectively named by the National Commission for Culture and the Arts as the San Vicente Ferrer Church Complex and Dampol Bridge of Dupax Del Sur.

Due to the outstanding cultural value of the town of Dupax del Sur, many scholars have been pushing for its inclusion in the Tentative List of UNESCO World Heritage Sites of the Philippines.

Poverty incidence of Dupax del Sur Source: Philippine Statistics Authority[19][20][21][22][23][24][25][26] Dupax del Sur, belonging to the lone congressional district of the province of Nueva Vizcaya, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code.