Incumbent Jerry Singson (Bileg Party) is running for a second term unopposed.

Singson was elected under the Nationalist People's Coalition unopposed in 2022.

The following are the candidates who are included in the ballot:[1] Incumbent Ryan Luis Singson (Bileg Party) is running for a second term unopposed.

The following are the candidates who are included in the ballot:[1] Ilocos Sur's 2nd provincial district consists of the same area as Ilocos Sur's 2nd legislative district.

The following are the candidates who are included in the ballot:[3] On January 25, 2025, Anthony Verzola, a reelectionist municipal councilor of Caoayan, was shot dead by unidentified gunmen riding motorcycles in Vigan.