At Walt Disney World, Eeyore can be sometimes be met in the Magic Kingdom next to the Pooh attraction, but not all the time.
Eeyore features everyday, all day, at the Crystal Palace Buffet on Main Street.
In Disneyland Paris, Eeyore is sometimes up by "it's a small world", or outside Plaza Inn on Central Plaza.
In California, Eeyore can always be found in Critter Country near the Pooh attraction.
In Tokyo Disneyland Eeyore can occasionally be found near the main entrance in World Bazaar.
As far as we know, Eeyore does not make appearances in Hong Kong Disneyland at this time.