Lainville-en-Vexin (French pronunciation: [lɛ̃vil ɑ̃ vɛksɛ̃], literally Lainville in Vexin, before 1997: Lainville)[3] is a commune in the Yvelines department in the Île-de-France region in north-central France.

This Yvelines geographical article is a stub.

You can help Wikipedia by expanding it.