Autoroute 640 (or A-640) is a Quebec autoroute that runs across the North Shore Region (paralleling the Rivière des Mille-Îles) from Route 344 in the Oka area to Route 138, where it ends as a four-lane expressway in Charlemagne. The road was designed to be northern bypass of the city of Montréal and was originally intended to cross the Lake of Two Mountains to connect to Autoroute 40 near Vaudreuil. It is currently 54.8 km (34.1 mi) long.

A-640 begins at Chemin d'Oka (Route 344) at a traffic circle near Oka National Park, and terminates at a signalized at-grade intersection with Rue Émile-Despins (Route 344) in Charlemagne.

History

A-640 was built over the following timeline:

• From Boul. des Promenades to A-15/TCH: 1961
• From Route 337 to A-40: 1972
• From A-15/TCH to Route 337: 1974
• From Route 344 to Boul. des Promenades: 1976

Exit list

This section is missing kilometre posts for junctions. Please help by adding them.

RCM	Location	km	mi	Exit	Destinations	Notes
Deux-Montagnes	Saint-Joseph-du-Lac	0.00	0.00	–	R-344 – Oka, Pointe-Calumet, Parc national d'Oka	Traffic circle
				2	Saint-Joseph-du-Lac, Pointe-Calumet	Westbound exit and eastbound entrance
	Saint-Eustache–Deux-Montagnes			8	Boulevard des Promenades – Deux-Montagnes, Sainte-Marthe-sur-le-Lac
	Saint-Eustache			11	R-148 (Boulevard Arthur-Sauvé) – Lachute, Saint-Eustache
				14	25 Avenue
Thérèse-De Blainville	Boisbriand			16	A-13 south (Autoroute Chomedey) – Laval, Montréal, Aéroport P.-E.-Trudeau	Northern terminus of A-13; exit 22 on A-13
				19	Boisbriand	Westbound exit is via exit 20
	Boisbriand–Sainte-Thérèse			20	A-15 (TCH) (Autoroute des Laurentides) – Blainville, Saint-Jérôme, Montréal, Aéroport Mirabel	Exit 20 on A-15
	Sainte-Thérèse–Rosemère			22	R-117 – Sainte-Thérèse, Blainville, Rosemère
	Blainville			24	Montée Lesage / Chemin du-Bas-de-Sainte-Thérèse
	Lorraine			26	Lorraine	Access via Boulevard de Gaulle
	Bois-des-Filion			28	R-335 – Bois-des-Filion, Sainte-Anne-des-Plaines	Future A-25 south
Les Moulins	Terrebonne			32	Avenue Urbanova	Eastbound exit and entrance
				35	Boulevard des Entreprises / Boulevard des Seigneurs
	Mascouche–Terrebonne			38	R-337 (Chemin Gascon) / Chemin des Anglais – Terrebonne, Mascouche
				42	A-25 / R-125 (Montée Masson) – Mascouche, Rawdon, Montréal	Signed as exits 42S (south) and 42N (north); exit 25 on A-25
				44	Chemin Charles-Aubert / Rue Louis-Hébert
	Terrebonne			45	Montée Dumais
				50	Montée des Pionniers
L'Assomption–Les Moulins	Terrebonne–Charlemagne			52	A-40 (Autoroute Félix-Leclerc) – Montréal, Québec, Aéroport P.-E.-Trudeau	Signed as exits 52-E (east) and 52-O (west)
Les Moulins	Charlemagne			–	R-344 to R-138 – Terrebonne, Repentigny	At-grade intersection
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access