well, it's somewhere in the south, when they teach Apu for the test of him being a full American, Homer says:
"The first thing they'll ask you is to point Springfield on the map... let's see..." and he points to somewhere in Canada, Lisa walks in and says: "No dad! It's not even near that!"
And she points to the state of Florida and around that all, but you can't see it because Bart's head is in the way...
And To, you have a chance of 1/9