Windham is a village in Portage County, Ohio, United States. It is formed from portions of Windham Township, one of the original townships of the Connecticut Western Reserve. The population was 2,209 at the 2010 census. In 1942, the US government chose Windham as the site of an army camp for workers at the newly built Ravenna Arsenal. As a result, Windham experienced the largest increase in population of any municipality in the United States between the 1940 and 1950 censuses: The population increased from 316 residents to 3,946.