Special Postcodes

GIR 0AA
Girobank, now owned by Alliance & Leicester. 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.com 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.
RE1
The deep space mining vessel Red Dwarf.
FX
FX - Fairfax. Used by the Royal Mail for training purposes.