Valmy is a rural commune in the Marne department in the Grand Est region in Northeastern France. In 2020, it had a population of 282. Th…Valmy is a rural commune in the Marne department in the Grand Est region in Northeastern France. In 2020, it had a population of 282. The town stands on the west flank of the Argonne massif, midway between Verdun and Paris, near Vouziers.