The Communauté d'agglomération de Mantes-en-Yvelines (or CAMY) is a former administrative entity in the Yvelines département, near Paris.

[2] The Communauté d'agglomération de Mantes-en-Yvelines is located at the south-west of the département of Yvelines, around the Seine river and Mantes-la-Jolie city.

[4] In 2013, five new towns entered the agglomération: Gargenville, Guernes, Fontenay-Mauvoisin, Fontenay-Saint-Père and Saint-Martin-la-Garenne, bringing the number of communes of CAMY to 35.

[5] Note that the second city of the metropolitan area, Limay, 16 005 inhabitants, which is also the most industrialized and do not want to join the CAMY.

It should, according to the SDCI Yvelines, join Issou and Guitrancourt, common on the right bank of the Seine, to form a new intercommunalité.