Calenzano is a comune (municipality) in the Province of Florence in the Italian region Tuscany, located about 11 km northwest of Florence. As of 31 December 2004, it had a population of 15,557 and an area of 76.9 km². The municipality of Calenzano contains the frazioni (subdivisions, mainly villages and hamlets) Baroncoli,Carraia, Collina, Croci di Calenzano, Leccio, Legri, Osteria degli Alberi, Querciola, San Donato, San Pietro in Casaglia, Secciano, Settimello, Sommaia, Spazzavento, and Travalle. Calenzano borders the following municipalities: Barberino di Mugello, Campi Bisenzio, Prato, San Piero a Sieve, Sesto Fiorentino, Vaglia, Vaiano.