Lainville-en-Vexin (, literally Lainville in Vexin, before 1997: Lainville)Décret du 22 décembre 1997 portant changement de nom de communes, Légifrance. is a commune in the Yvelines department in the Île-de-France region in north-central France.
See also Communes of the Yvelines department
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