KXAN.com has a list of address and some tips on getting rid of junk mail – (pictured here, another option, from Redpac.com – use their business reply mails to send them back their own junk mail…) –

This is the Postal Service Statement:

The Postal Service must deliver all properly posted mail. You can, however, reduce the amount of advertising mail you receive by contacting the following organizations to request removal of your name from mailing lists:

Mail Preference Service
Direct Marketing Association
P.O. Box 282
Carmel, NY 10512-0282

Trans Union LLC
Name Removal Option
P.O. Box 505
Woodlyn, PA 19094-0505

Experian Consumer Services
901 W. Bond Street
Lincoln, NE 68521-3694

Equifax Inc.
Name Removal Option
P.O. Box 740241
Atlanta, GA 30374-0241

Up to 90 percent of mailing lists are accessed by this process. Registrants generally note a decrease of unsolicited mail one to three months after their names are listed. Since some customers may receive mail under various names, include alternative names or spellings to ensure that the advertiser’s mail is stopped.

In summary, by law we must deliver ALL mail that has been paid for – including your private personal mail and that of businesses and organizations.

Sick Of Junk Mail? We Can Help – [via] Link.

U.S. Laws on Direct Mail – Link.