Valmy is a census-designated place in Humboldt County, Nevada, United States, named after the Battle of Valmy in France. It is home to Newmont Mining's large Lone Tree gold-mining complex; mining ended there in 2007, though a small gold resource remains in place there. Valmy is also home to the North Valmy Generating Station, jointly owned by NV Energy and Idaho Power.Valmy has a post office, with the ZIP code 89438. As of the 2010 census, the community had a population of 37.