Putnam is a town in Windham County, Connecticut, United States. The population was 9,584 at the 2010 census. It is home to WINY, an AM radio station. Putnam, originally known as Aspinock, then part of Killingly, is a New Englandmill town incorporated in 1855. Created from sections of Killingly, Pomfret, and Thompson, the town was named in honor of Revolutionary War General Israel Putnam.