it is springfeld, IL because in the 9th episode of the 19th season the zoom out from there house to see a map of the world and it looks like it is in kuntuky, BUT, in the simpsons movie the say that one of the border states of springfeild is kuntucky which elimanates kuntucky from being the state they live in and since IL is right next to KN it must be Springfeild,IL.
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it is springfeld, IL because in the 9th episode of the 19th season the zoom out from there house to see a map of the world and it looks like it is in kuntuky, BUT, in the simpsons movie the say that one of the border states of springfeild is kuntucky which elimanates kuntucky from being the state they live in and since IL is right next to KN it must be Springfeild,IL.