The organisation named Communauté de Communes Couesnon Marches de Bretagne is a group of municipalities in the department of the Ille-et-Vilaine, in Brittany. The total population of this intermunicipal organisation is 22390 inhabitants, spread across a surface area of 384.11 km². The population density is 49 inhabitants/km². The maximum altitude is 194 metres. The Communauté de Communes Couesnon Marches de Bretagne public intermunicipal cooperation establishment comprises the 15 municipalities listed below.