We couldn’t find an address for Mickey Mouse on the Disney website.
Disney gives its visitors the chance to e-mail specific departments, but provides no direct mail addresses for their characters and no mailing address at all.
Like most stars, though, letters usually get to them through the agencies they work for.
We’re not guaranteeing a reply, but her best bet is the publications division.
Address the envelope to:
c/o Walt Disney Publications 500 South Buena Vista
Burbank, California 91521 USA