Board Thread:Questions and Answers/@comment-6119652-20130320192002/@comment-5722194-20130320215207

It's really hard to say, as Blizzard hasn't really established true borders for the kingdoms. Lordaeron definitely has a good chunk of land, but it's not entirely clear what parts are carved off for Gilneas, Alterac, Dalaran, etc. It's really up to individual interpretation with who claims what town nowadays. I think that Lordaeron and Stormwind would have been around the same size while Lordaeron was still functional though.