Area: 100 kmē 

Basildon is a new town located in south Essex, England at 51°34'34?N, 0°29'19?E. It was designated as a new town after World War II to accommodate the London population overspill. Basildon was created from several pre-existing towns; Pitsea, Laindon & Vange. The larger Basildon district, formed in 1974 by the Local Government Act of 1972, includes Billericay and Wickford. To the north of Basildon lies Chelmsford. Southend neighbours Basildon to the east.

The first historical reference to Basildon is in records from 1086. It is mentioned in the Domesday Book as 'Belesduna'.

It is believed that 'Basildon' is derived from the Anglo-Saxon name of 'Beorhthealh' and the Anglo-Saxon word for hill: 'dun'. In historical documents, Basildon has had various names including Berdlesdon, Batlesdon & Belesduna.

The constituency of Basildon is thought to be a barometer of public opinion in General Elections. The results of the constituency have been the same as the overall result of the General Electon since 1974.