[QUOTE=Sapo]
please provide (and quickly!). 
at any rate, I just learned that there is a town by the name of North Pole in Alaska (near Anchorage, Google map it). They will reply to any mail they receive that has a return address. The USPS will even send there unstamped mail.
[/QUOTE]
Just send a letter to:
Santa Claus
North Pole
Canada
H0H 0H0
Probably, though, if you mail now, you’ll get a letter back after Christmas, gently suggesting you write earlier next year.
Various postal administrations around the world provide a Santa service.
In Australia, you can send a letter to Santa, North Pole 9999 with a standard stamp and you will get a reply from the bearded guy.
I suspect most letters “Santa” gets are pranks. I sent one on behalf of my boss one year.
[QUOTE=BobT]
There is also a note that the letter went to the “Nixies”. I have horrible handwriting, but I think this is the first time, I’ve ever had a letter go there.
[/QUOTE]
My letter carrier husband says he knows this as a postal shorthand for requiring a better address (if I understood his explanation right).
The weird thing is that the Post Office had delivered something to that same address before. With the same error.