Putnam Valley is a town in Putnam County, New York, United States. The population was 11,762 at the 2020 census. Its location is northeast of New York City, in the southwestern part of Putnam County. Putnam Valley calls itself the "Town of Lakes". Some iconic places: United States Military Academy, Breakneck Ridge, Fishkill Farms, Fahnestock State Park, Hudson Highlands State Park, MANITOGA / The Russel Wright Design Center