Château-Gontier-sur-Mayenne

Château-Gontier-sur-Mayenne is a commune of 16,776 people (2017). It is found in the region Pays de la Loire in the Mayenne department in the northwest of France. The municipality was created on 1 January 2019 and consists of the former communes of Château-Gontier (the seat), Azé and Saint-Fort.