Parliamentary constituencies in Essex

The county of Essex (which includes the unitary authorities of Southend-on-Sea and Thurrock) is divided into 18 parliamentary constituencies (sub-classified into six of borough type and twelve of county status, affecting the level of expenses permitted and status of returning officer). The county saw the majority of its population and seats removed on the creation of the county of Greater London in 1965.

Source: Wikipedia — Parliamentary constituencies in Essex (CC BY-SA 4.0)