This is all I could find.
Based on
http://themeparks.about.com/cs/disneyparks/a/wdwmain.htm:
"It's been a number of years since Walt Disney World's 1971 opening but some people still refer to the Magic Kingdom, the east coast version of the original
Disneyland, as "Walt Disney World" -- as if the one park was pretty much the whole deal.
Sure, the Magic Kingdom, with its Cinderella Castle, Dumbo ride, Space Mountain, Pirates of the Caribbean and other icons, is the heart and soul of the Florida resort.
But it comprises a mere few dozen acres among WDW's 35,000 acres. That's 47 square miles, roughly the size of two Manhattan islands, filled with four theme parks, two waterparks, 30 resort hotels, six golf courses, two shopping-dining-entertainment complexes and -- Are you still with me? -- enough other diversions to keep over 54,000 "cast members" (that's Disney-speak for employees) busy catering to tens of millions of guests annually.