Saint-Jean-sur-Vilaine (French pronunciation: [sɛ̃ ʒɑ̃ syʁ vilɛn]; Gallo: Saent-Jan-sur-Vilaèyn, Breton: Sant-Yann-ar-Gwilen) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Saint-Jean-sur-Vilaine are called saint-jeannais in French.
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