|Comune di Piansano|
|Province / Metropolitan city||Province of Viterbo (VT)|
|• Mayor||Roseo Melaragni (since June 2004 - Second mandate)|
|• Total||26.5 km2 (10.2 sq mi)|
|Elevation||409 m (1,342 ft)|
|Population (31 December 2004)|
|• Density||84/km2 (220/sq mi)|
|Time zone||CET (UTC+1)|
|• Summer (DST)||CEST (UTC+2)|
|Patron saint||St. Bernardino of Siena|
|Saint day||May 20|
Piansano is a comune (municipality) in the Province of Viterbo in the Italian region Latium, located about 90 kilometres (56 mi) northwest of Rome and about 25 kilometres (16 mi) northwest of Viterbo. As of 31 December 2004, it had a population of 2,232 and an area of 26.5 square kilometres (10.2 sq mi).
- All demographics and other statistics: Italian statistical institute Istat.