O-Town! I was just about to say that! Also, I wanna live in a spaceship with GIR or Nowhere, Kansas.
Any cartoon world such as Beverly Hills (Totally Spies), Middleton (Kim Possible), everView (everGirl), Hard to Find City (Teddy Ruxpin) and Magix (Winx Club) as much as Ponyville (My Little Pony: Friendship is Magic), Enchancia (Sofia the First) and Downtown City (Littlest Pet Shop) with Blythe Baxter.
Honorable mentions: Unova (Pokemon), Springfield (The Simpsons), Arendelle (Frozen), France (Leap!/Ballerina), Gravity Falls (Gravity Falls) and Heartlake City (LEGO Friends).
Note: Beverly Hills and Middleton are based on realistic cities in California and Wisconsin (one of which is the official home of American Girl).
Lisa Frank - You Gotta Have It! Pokemon - Gotta Catch 'Em All!