Shield: From the Provincial Seal of Isabela where the town is located.

Green Lines: Verdant fields of Naguilian.

Carabao Head: Main work animal for crop production.

Laurel Leaves: Unity of the people of Naguilian especially among Ilocanos and Ibanags.

Corn & Tobacco Plants: Principal products of the Municipality.

"SeƱal Ti Ili": "Official Seal of the Municipality" in Ilocano and Ibanag dialects.

1896: Year when Naguilian was established as an independent Municipality by the Royal Order from the King of Spain.