I found it under CONTACT, here ya go!
Contacting John and JohnMellencamp.com
Many people email asking us to forward messages to John, or requests for charity auction donations, autographs etc. John Mellencamp does not see the emails sent to this website. However your messages about the site and John's career are read and at times replied to (by mellencamp.com staff) or forwarded on to his management and record label.
It is possible to contact John Mellencamp via postal mail. Listed below is a PO BOX that is delivered to John's office. Please read the notes below:
John and his staff's primary job is making, promoting and dealing with the business surrounding John's music. Please be patient if sending an autograph or charity request, we regret that the wait can be months when John is very busy.
There are several things that you can do to help speed up this process:
Send a pre paid (w/priority mail return postage stamp included), self addressed return envelope/mailer along with your item. If you do not include enough return postage your item will not be returned.
Sending flat and small items (pictures/cd covers) is recommend. The mail is not picked up every day and large items that do not fit in the box are returned by the post office after a few days.
Autograph/memorabilia dealers will not have their items returned.
Please do not send any item that is a one of a kind.
If you are making a charity request please write that on the outside of your letter.All letters for John, Elaine or his band should be mailed to the following address. If you are sending a letter for someone other than John please insert a Attn: persons name line before the PO Box:
John Mellencamp
P.O. Box 6777
Bloomington, IN 47407-6777