Messac (; ; Gallo: Meczac) is a former commune in the Ille-et-Vilaine department of Brittany in northwestern France. On 1 January 2016, it was merged into the new commune Guipry-Messac.Arrêté préfectoral 23 July 2015
Population Inhabitants of Messac are called Messacois in French.
See also Communes of the Ille-et-Vilaine department
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