Males had a median income of $39,688 versus $20,250 for females. The per capita income for the CDP was $16,776. About 14.8% of families and 14.1% of the population were below the poverty line, including 21.7% of those under age 18 and 7.7% of those age 65 or over. The hamlet is named after Nathaniel Lyon who moved to the base of the mountain that also bears his name in 1803 and died circa 1850. Lyon was a relative of General Nathaniel Lyon (1818–1861). Republic Steel Corporation was one of the last major steel firms to use low-phosphorus Adirondack magnetites, operating the Chateaugay Ore & Iron Company from 1939 to 1967. The Chateaugay mine was one of the deepest commercial iron ore mines in the United States, with stopes as much as below the surface. Lyon Mountain's iron ore was considered the best in the industry and was the material of choice for John Roebling and Sons in the construction of the Brooklyn Bridge. In later years, Roebling used Lyon Mountain ore in the construction of the George Washington Bridge and the Golden Gate Bridge. Lyon Mountain is a hamlet within the town of Dannemora. Public services and government affairs are administered by the town, which is governed by a board of councilors. Lyon Mountain is the home of the Lyon Mountain Miners who play in the Champlain Valley Baseball League. They play at the famous Big Ball Field, a major league-sized park in the heart of Lyon Mountain.