Witham, Essex, is in area code 01376, or +44 1376 from outside the UK.
Cardiff business center
The airport code for Witham Field is SUA.
01375 is the area code for Grays Thurrock in Essex.
01206
This isn't a London code. It is the area code for Brentwood in Essex which is about 30 miles northeast of London.
SS is a Post Code Area in the UK, England, County of Essex. It stands for Southend-on-Sea. A Post Code Area is made of smaller Post Code Districts, each representing a town and its immediate environs.
Essex has several different telephone area codes. To call the UK from the Republic of Ireland, replace the leading 0 of the UK domestic number with 00 44.
0374 used to be Basildon, Essex. It was then used by Vodafone for mobile (cell) numbers. This is no longer a geographic area.
The airport code for Essex County Airport is CDW.
Newark and Patterson New Jersey are in 973. Also, the area code contains Bergen, Essex,Hudson, Passaic, Morris, Sussex and Union Counties.
01375 from within the UK, or +44 1375 internationally
EN9 is the post code of Waltham Abbey, Essex.