You can find most of them at EPCOT in World Showcase- usually with much shorter lines than you'll find at MK. Snow White is usually in Germany, Jasmine in Morrocco, Belle and Aurora in France. You can also find Mulan in Germany and Alice and/ or Mary Poppins in the UK. The only Princesses you're likely to miss at EPCOT are Cinderella (I've seen her in France on rare occasions, but she's usually just at Toontown or her character meals), Ariel (who appears in her Grotto at MK and at some of the Princess meals at Norway), and Pocahontas (normally at Rafiki's Planet Watch at AK).
If you go to see the Princesses in Toontown, I recommend seeing them when it first opens at 10am. Cinderella, Aurora and Belle are the Princesses who appear here the most.