According to Wikipedia, the 1st Disney Store opened in Glendale, California, on March 28th, 1987.
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According to this button, from my Jar of Buttons, the 500th Store opened on July 5th 1996, and according to Google, that store was in Phoenix, Arizona.
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Of course, there has been a lot of changes since then, including not actually being owned by Disney for a time. They are now once again owned by The Walt Disney Company.
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Happy 25th Anniversary to The Disney Store!
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