Sant'Andrea a Montecchio is a village in Tuscany, central Italy, in the comune of Siena, province of Siena. At the time of the 2001 census its population was 726. Popolazione residente - Siena (dettaglio loc. abitate) - Censimento 2001 , Istat.

Sant'Andrea a Montecchio is about 7 km from Siena.

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