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What jhowell said is correct. Calibre can organize images into sub-folders by right-clicking on the image and renaming it with the appropriate sub-folder name in the path. Calibre creates the subfolder, and updates the link to match the new location. You can test this by saving the epub (to your desktop or somewhere) then rename that file to a .zip. Using your file manager you can open up that zip and see that the images are indeed located in sub-folders. However, Calibre still lists all the images in the single images section of it's files browser without breaking them into sub-folders.
This is different from Sigil, which will actually move your images into a single images folder.
One work-around you can try is to simply name your image files such that they will automatically sort themselves by group. eg. All pictures of Alaska begin with "AK-", all pictures of South Carolina begin with "SC-", etc.
Cheers,
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