Sismano lies 13 km from Todi and 5 km from Avigliano; according to the Italian state census of 2001, Sismano has 17 inhabitants in the densely built historic center and 308 in all.
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In 1324, a bloody battle was fought in the vicinity, between forces of Todi and Perugia and their friends and allies from Narni, Spoleto and Florence.