This article is from the Charmed FAQ, by Colin A. McGregor (firstname.lastname@example.org) with numerous contributions by others.
The show's address is Charmed, c/o WB Television Network, 4000 Warner
Blvd., Building 4-R, Burbank, CA, 91522, U.S.A.. Shannen Doherty and
Alyssa Milano can be reached c/o United Talent Agency, 9560 Whilshire
Blvd., Suite 500, Beverly Hills, CA, 90212, U.S.A.. The addresses for
other agents/PR people of other cast members would be appreciated.