[4] Divilacan was derived from the native Casiguran Dumagat Agta compound word vilacan, meaning "fish and shell."

[7] On October 24, 2024, Severe Tropical Storm Trami (Kristine) made landfall to this town causing big destruction along with other cities/municipalities.

The town is bounded to the north by Maconacon, Tumauini to the west, Ilagan to the southwest, Palanan to the south and the Philippine Sea to the east.

Poverty incidence of Divilacan Source: Philippine Statistics Authority[14][15][16][17][18][19][20][21] As a municipality in the Province of Isabela, government officials in the provincial level are voted by the electorates of the town.

The construction of an 82-kilometer Ilagan–Divilacan Road through the protected Sierra Madre mountains is on-going to open access to the coastal towns of Divilacan, Palanan, and Maconacon.

The approved budget contract of the project amounting to P1.5B, will pass through the foothills of the 359,486-hectare Northern Sierra Madre mountain ranges.