- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
Lyon Mountain is a hamlet (and census-designated place) located in the Town of Dannemora in Clinton County, New York, United States. The population was 423 at the 2010 census.
Lyon Mountain is in the western part of the town.
The Lyon Mountain Correctional Facility, a minimum security prison, is located nearby. The Facility is currently closed and property is up for sale.