Montsûrs is a commune of 2,020 people (1999). It is found in the region Pays de la Loire in the Mayenne department in the northwest of France. On 1 January 2017, it was merged with Saint-Céneré and formed the short-lived commune Montsûrs-Saint-Céneré. Montsûrs-Saint-Céneré was merged with Deux-Évailles, Montourtier and Saint-Ouën-des-Vallons on 1 January 2019, and the new commune took the name of "Montsûrs".