Bisaccia is an Italian town and comune, population 4,382, situated in the province of Avellino. It borders the communes of Andretta, Aquilonia, …Bisaccia is an Italian town and comune, population 4,382, situated in the province of Avellino. It borders the communes of Andretta, Aquilonia, Calitri, Guardia Lombardi, Lacedonia, Scampitella and Vallata.