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. Established in November 2015, effective from January 2016, its seat is in Montmorency.^[1] Its area is 74.1 km,² and its population was 184,945 in 2021.^[2]

Plaine Vallée
Communauté d'agglomération
Country	France
Region	Île-de-France
Department	Val-d'Oise
No. of communes	18
Established	2016
Seat	Montmorency
Area	74.1 km2 (28.6 sq mi)
Population  (2021)	184,945
• Density	2,496/km2 (6,460/sq mi)

Composition

The communauté d'agglomération consists of the following 18 communes:^[1][3]

1. Andilly
2. Attainville
3. Bouffémont
4. Deuil-la-Barre
5. Domont
6. Enghien-les-Bains
7. Ézanville
8. Groslay
9. Margency
10. Moisselles
11. Montlignon
12. Montmagny
13. Montmorency
14. Piscop
15. Saint-Brice-sous-Forêt
16. Saint-Gratien
17. Saint-Prix
18. Soisy-sous-Montmorency