Fiesso Umbertiano is a comune (municipality) in the Province of Rovigo in the Italian region Veneto, located about 80 km southwest of Venice and about 20 km southwest of Rovigo. As of 31 December 2004, it had a population of 4,207 and an area of 27.3 km2. The municipality of Fiesso Umbertiano contains the frazioni (subdivisions, mainly villages and hamlets) Fornace Carotta, La Foscarina, Roncala, Capitello and Piacentina. Fiesso Umbertiano borders the following municipalities: Canaro, Castelguglielmo, Frassinelle Polesine, Occhiobello, Pincara, Stienta.

Demographic evolution