Beauty and the Beast is obviously set in 18th century French countryside, Aladdin is Medieval Arabian Peninsula, and Princess and the Frog is Prohibition-Era New Orleans, but what about the others? My guesses:
Snow White: Renaissance-Era Germany or possibly Switzerland
Cinderella: 18th Century France (Chateaus, French names, etc)
Sleeping Beauty: Medieval England
Little Mermaid: 19th Century Denmark (Caribbean-accented characters aside, I'm basing this one off of the architecture and technology presented in the film, as well as the story's origin)
Yes, I edited the post...I accidentally sent several drafts to the queue and the first one is the one that was accepted.