Quebec Route 340

Route 340 is a provincial highway situated in the Montérégie region of Quebec west of Montreal. It runs for just over 40 kilometers from the Ontario-Quebec border in Saint-Télesphore (as a continuation of Stormont, Dundas and Glengarry County Road 18) and ends in Vaudreuil-Dorion at the junction of Autoroute 20.

Municipalities along Route 340

 * Saint-Télesphore
 * Saint-Polycarpe
 * Sainte-Justine-de-Newton
 * Saint-Clet
 * Les Cèdres
 * Saint-Lazare
 * Vaudreuil-Dorion