Castel Baronia is a town and comune in the province of Avellino, Campania, Italy. Castel Baronia has a population of 1,233 inhabitants (Castellesi) and a surface of 15.3 square kilometres (5.9 sq mi) thus showing a population density of 80.59 inhabitants per square kilometer. It rises 639 metres (2,096 ft) above the sea level. Castel Baronia is situated in the green area that extends from the Ufita valley to the province of Foggia, a gracious area, forming part of the Comunita' Montana of the Ufita Valley.