Communauté d'agglomération Dinan Agglomération is an intercommunal structure, centred on the city of Dinan. It is located in the Côtes-d'Armor department, in the Brittany region, western France. It was created in January 2017. Its seat is in Dinan. Its area is 932.4 km2. Its population was 97,080 in 2017, of which 14,166 in Dinan proper.