Here are the area numbers of every 5 Kingdoms in matter of quantity of land inside the berm :
Le Parc Disneyland : 140 Acres (566,560 M2)
Tokyo Disneyland : 115 Acres (465,388 M2)
Magic Kingdom : 107 Acres (433,000 M2
Hong Kong Disneyland : 100 Acres (404,685 M2)
Disneyland Park : 85 Acres (344,000 M2)
Now beside Disneyland, not every square meters of those aera numbers are occupied by the park. Walt Disney World’s Magic Kingdom holds in its berm a large unoccupied surface, so does, in smaller figures Disneyland Paris and Hong Kong Disneyland.
We can also say, that beside its most modest enterprise : Hong Kong Disneyland, Disney always increased the size of its Magic Kingdoms over the years.