 The "comune" is formed by the municipal seat of Collesalvetti and the "frazioni" – towns and villages – of Castell'Anselmo, Colognole, Guasticce, Nugola, Parrana San Martino, Parrana San Giusto, Stagno and Vicarello.The hamlet of Mortaiolo is also included in the municipality.Collesalvetti is twinned with