The village is located in the Lower Monferrato, 12 km north of Asti, in the Valle Versa.
The inhabitants are about 2,800 and the municipal territory is 20 Km².
Castell'Alfero is part of the Comunità Collinare Monferrato Valle Versa.
Its most important places: Country (historical center), Callianetto (residential area), Station (railway station, industrial zone, and headquarter of the scholastic Istituto Comprensivo) and Noveiva (the commercial center).
In Castell'Alfero in 1774 was born Giovan Battista De Rolandis, creator of the Italian flag Tricolor, while in 1808 Gianduja was born in Callianetto, the carnival mask symbol of Piedmont.
To see: the eighteenth-century Castle of Counts Amico (Castello dei Conti Amico), Church of S. Maria dell'Assunta (Chiesa di Santa Maria dell'Assunta), the twelfth-century Romanesque church Madonna della Neve, the Ciabot 'd Gianduja and the Church of Santissima Annunziata (Chiesa della Santissima Annunziata).
In the basement of the Castle there is the Museo 'L Ciar, an important collection of testimonies of past life, while in Serra Perno there is the Roseto della Sorpresa, a garden with over 500 old roses.
The main sport is the tambourine, with 8 badges won by SVAB and Callianetto.
Castell'Alfero is twinned with the French town of Lafrançaise and participates in the Palio di Asti.
The American musician and composer Alan Silvestri is an honorary citizen of Castell'Alfero.
• Castell'Alfero tourist guide