Glenville is a neighborhood and census-designated place in the town of Greenwich in Fairfield County, Connecticut, United States. As of the 2010 census, it had a population of 2,327. It is located in the western part of Greenwich at the falls of the Byram River, which provided waterpower when this was a mill village. The area is home to Glenville Elementary school, Western Civic Center and a volunteer fire station, the Glenville Fire Department.