Gaillon-sur-Montcient

Infobox Commune de France|nomcommune=Gaillon-sur-Montcient | région=Île-de-France | département=Yvelines | arrondissement=Mantes-la-Jolie | canton=Meulan | insee=78261 | cp=78250 | maire=Claude Durand| mandat=2001-2008
intercomm=
longitude=1.89388888889 |latitude=49.0263888889 |alt moy=91 m |alt mini=22 m |alt maxi=126 m | hectares=483 | km²=4,83 | sans=646 Gaillonnais| date-sans=1999 | dens=133,7 |

Gaillon-sur-Montcient is a village and commune in the Yvelines "département" of northern France.

ee also

*Communes of the Yvelines department