Mercogliano is an Italian town and comune in the province of Avellino, Campania, southern Italy. Mercogliano is a hill town located near the …Mercogliano is an Italian town and comune in the province of Avellino, Campania, southern Italy. Mercogliano is a hill town located near the western suburb of Avellino and below the mount Partenio. The municipality borders with Avellino, Monteforte Irpino, Mugnano del Cardinale, Ospedaletto d'Alpinolo, Quadrelle and Summonte.