Quinciano is a village in Tuscany, central Italy, administratively a frazione of the comune of Monteroni d'Arbia, province of Siena. At the time of the 2001 census its population was 17. Popolazione residente - Siena (dettaglio loc. abitate) - Censimento 2001 , Istat.

Quinciano is about 20 km from Siena and 5 km from Monteroni d'Arbia.

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