US:
c/o Arthur A Levine Books
557 Broadway
New York, NY 10012


Or


UK:
c/o Christopher Little Litterary Agency
Eel Brooks Studios
125 Moore Park Road
London SW6 4PS

c/o Bloomsbury Publishing
38 Soho Square
London W1V 5DF UK


a. Introduce yourself and tell a bit about you
b. Tell Jo why you love Harry Potter
c. Ask questions
d. Maybe make something for her; draw, poem, anything you want
e. Send it off (sometimes it is good to enclose a International Reply Coupon if you liveoutside the UK, but they are not necessary)
f. Wait a few months and see if you get a reply! Try not to think about it so that it is a surprise when it comes. It's more fun that way!

What is an international reply coupon?
-An international reply coupon (IRC) is a coupon that can be used to post a standard 20 gram letter anywhere in the world. IRCs are accepted and available in all Universal Postal Union (UPU) member countries.(wikipedia)
-They are $1.85 in the United States.
-You just put it inside the envelope and the receiver can use it to buy a stamp to send out your reply.

Other stuff:
~You can make your letter stand out by decorating your envelope or make Jo a hand-made card.
~Write from your heart and your letter is sure to get noticed.
~Scholastic is very nice and they try to reply to most of the letters that are sent to them, so even if you are from the U.K. I would send your letter to Scholastic.
~Most of all just have fun with it!


Some of the information from above is from Magical-Menagerie.com