Deep River is a town in Middlesex County, Connecticut, United States. The population was 4,610 at the 2000 census. It is part of what the locals call the 'Tri-town Area' made up of Deep River, Chester, and Essex, Connecticut. Deep River Center apartments for rent comparison page shows most up to date rent information on Deep River Center apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.