Montillières-sur-Orne is a commune. It is found in the region Normandy in the Calvados department in the northwest of France. The municipality was created on 1 January 2019 and consists of the former communes of Trois-Monts (the seat) and Goupillières.
- Arrêté préfectoral 28 September 2018, p. 91 (in French)
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