Castello di Annone borders the following municipalities: Asti, Cerro Tanaro, Quattordio, Refrancore, Rocca d'Arazzo, and Rocchetta Tanaro. Its name derives from the Latin ad nonum ("nine miles"), indicating its distance from Asti.
Castello di Annone is located near the following towns: Asti, Cerro Tanaro, Quattordio, Refrancore, Rocca d'Arazzo, and Rocchetta Tanaro. Its name originates from the Latin phrase "ad nonum," which means it is nine miles away from Asti.