Mattydale is a hamlet in Onondaga County, New York, United States. The population was 6,446 at the 2010 census. Mattydale is a community in the northeast part of the town of Salina and is a northern suburb of Syracuse. Mattydale was named for the farm of Frank Matty. Although born in nearby Chittenango, New York, Wizard of Oz author L. Frank Baum spent much of his childhood on the site of Roxboro Road Middle School.