The canton of Montfort-l'Amaury is a former canton of France, located in the Yvelines department. It had 44,514 inhabitants (2012).Populations légales 2012: 78 Yvelines, INSEE It was disbanded following the French canton reorganisation which came into effect in March 2015.

The canton comprised the following 29 communes:

Auteuil Autouillet Bazoches-sur-Guyonne Béhoust Beynes Boissy-sans-Avoir Flexanville Galluis Garancières Goupillières Grosrouvre Jouars-Pontchartrain Marcq Mareil-le-Guyon Méré Les Mesnuls Millemont Montfort-l'Amaury Neauphle-le-Château Neauphle-le-Vieux La Queue-les-Yvelines Saint-Germain-de-la-Grange Saint-Rémy-l'Honoré Saulx-Marchais Thoiry Le Tremblay-sur-Mauldre Vicq Villiers-le-Mahieu Villiers-Saint-Frédéric

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