Saks Fifth Avenue's shoe department is so big it has its own zip code.
The Philadelphia Inquirer: "Having your own zip code is no longer just the punch line to a fat joke.
The U.S. Postal Service has allowed Saks Fifth Avenue to have its own vanity zip code - for the shoe department at its flagship Fifth Avenue store in New York. It was just rechristened "10022-SHOE." Saks is the first entity to receive such a customized code.
The Postal Service maintains that these last four letters are just a fun, creative marketing strategy and that they have nothing to do with processing or delivery. The agency also claims that there are no plans to allow others to receive vanity zip codes at present. But others have inquired."
Also, see a press release back from May.
-- via Base Notes forum