To be more specific:
All Stars and Pop are 260 square feet. Kind of tight in my opinion.
PO-FQ, POR and CSR are 314 sqaure feet.
Caribbean Beach rooms are 340 square feet.
AKL standard rooms are 344 sq. feet. AKL deluxe rooms are 381 sq. feet.
WL rooms vary from 350 to 1071 sq. feet. I think that goes up to their deluxe room/junior suite.
Boardwalk Inn/Villa rooms range in size from 422-1071 sq. feet. The two bed and grad villas are probably way bigger than 1071.
The rooms at the Contemporary are very large - 436 sq. feet.
Fort Wilderness Cabins are 504 sq. feet.
The rooms at the Grand Floridian are 400 sq. feet. (There are some rooms that are bigger but I don't know wxactly how much bigger).
Old Key West rooms start at 376 sq. feet for a studio, 1086 sq. feet for a one bedroom, 1392 sq. fet fr a two bedroom and the Grand Villas are 2265 sq. feet.
The Polynesian's rooms are 409 sq. feet.
The rooms at the Yacht and Beach Club are 380 sq. feet.
I goe my information from my "Passporter" book.
Hope this helps!