If you watch beginning clip where the camera zooms out of the united states from the Simpson's house you can clearly see it's either Illinois or Ohio. Of course it can't be Illinois because Springfeild Illinois is the capital city and the Springfeild in the Simpsons isn't the capital city. Ohio is where the Simpsons live. In one of episodes Marge is on the phone and the person on the other line asks what state they live in, before Marge says the state Mod walks in and Marge says "Oh'hi'ya Mod" clearly saying "Ohio" as a hint.
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If you watch beginning clip where the camera zooms out of the united states from the Simpson's house you can clearly see it's either Illinois or Ohio. Of course it can't be Illinois because Springfeild Illinois is the capital city and the Springfeild in the Simpsons isn't the capital city. Ohio is where the Simpsons live. In one of episodes Marge is on the phone and the person on the other line asks what state they live in, before Marge says the state Mod walks in and Marge says "Oh'hi'ya Mod" clearly saying "Ohio" as a hint.