Special Postcodes

GIR 0AA
Girobank, now owned by Santander. Guardian article
XM4 5HQ (previously SAN TA1)
Santa Claus’s full address is Santa Claus (or Father Christmas), Santa’s Grotto, Reindeerland, XM4 5HQ.

Fictional Postcodes

At the moment, WriteToThem can’t directly get you in contact with representatives of fictional locations. Hopefully, the links below will help.

AM
Ambridge, Borsetshire. Home of The Archers.
M10 9KC
Coronation Street, Weatherfield.
RE1
The deep space mining vessel Red Dwarf.
WG7 7FU
West Wallaby Street, Wigan. Home of Wallace and Gromit (Wigan’s postcode area is actually WN).
FX
FX - Fairfax. Used by the Royal Mail for training purposes.

Previously Fictional Postcodes

E20
This used to be a fictional postcode district for Walford, East London, home of EastEnders, but it started being used for real by the Olympic Park in 2011.