Putnam is a town in Windham County, Connecticut, United States. The town is part of the Northeastern Connecticut Planning Region. The population was 10,214 at the 2020 census. Putnam, originally known as Aspinock, then part of Killingly, is a New England mill town incorporated in 1855. Created from sections of Killingly, Pomfret, and Thompson, th…Putnam is a town in Windham County, Connecticut, United States. The town is part of the Northeastern Connecticut Planning Region. The population was 10,214 at the 2020 census. Putnam, originally known as Aspinock, then part of Killingly, is a New England mill town incorporated in 1855. Created from sections of Killingly, Pomfret, and Thompson, the town was named in honor of Revolutionary War General Israel Putnam.
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