La Mézière is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. In 2008, 0.84% of primary-school children atten…La Mézière is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. In 2008, 0.84% of primary-school children attended bilingual schools. Inhabitants of La Mézière are called Macériens in French.