Communauté d'agglomération Plaine Vallée

Communauté d'agglomération Plaine Vallée is the communauté d'agglomération, an intercommunal structure, covering northwestern suburbs of Paris. It is located in the Val-d'Oise department, in the Île-de-France region, northern France. It was created in January 2016. Its population was 183,063 in 2014. Its seat is in Montmorency.

The communauté d'agglomération consists of the following 18 communes: