UK
- Essex, county ofEast of England
United States of America
- Essex, a city in Middlesex County, Connecticut
- Essex, village of Kankakee County, Illinois
- Essex, Page County Town, Iowa
- Essex, census-designated place in Baltimore County, Maryland
- Essex, Essex County Municipality, Massachusetts
- Essex, Clinton County Township, Michigan
- Essex, Stoddard County Town, Missouri
- Essex, county town of Essex, New York
- Essex, a town in Chittenden County, Vermont