Shield: From the Provincial Seal of La Union where the Municipality is located.
1886: Year when Tubao was founded.
Scroll: Provincial motto in local dialect --"In Unity There Is Strength"
Upper Design: Boiling cauldron, shaking hand, and native tobacco: Warmth, unity, peace and reconciliation. An ever-burning desire in preserving oneness.
Central Design: Angel who helped St. Isidore, the patron saint of farmers.
Lower Design: Major crop of the town.