Château-Gontier-sur-Mayenne () is a commune in the Mayenne department in north-western France.INSEE commune file It was established on 1 January 2019 by merger of the former communes of Château-Gontier (the seat), Azé and Saint-Fort.Arrêté préfectoral 14 November 2018
Population
See also Communes of the Mayenne department
References