I saved a post which has Oprah's address. Hope it helps.

I have another address letters to Oprah can be sent to:

Again it may be addressed:
     Oprah  or Oprah Winfrey   or   Harpo Productions or any combination
of
these.
     PO Box 909715 - Chicago - IL - 60690

There is also a phone number that may be called (and real people
actually
answer it!)
     312 - 633 - 0808