 The municipality of Sant'Olcese contains the "frazioni" (subdivisions, mainly villages and hamlets) Manesseno, Comago, Arvigo, Torrazza, Casanova, Trensasco, Piccarello, and Vicomorasso.At Comago, the Comune holds the Park & c. 1850 Victorian English country house, the Villa Serra.This house, built by the Marquis F. Orso Serra, an Anglophile, is one of very few Victorian period English country house designs to be found in Italy.