Everyone, let's look to 1F06, "Boy-Scoutz N The Hood" for a moment. When Bart and Milhouse go crazy (Broadway style) a very memorable song, "Springfield, Springfield" is sung by the two and a sailor. The "On The Town" parody gives us the most definitive clue ever as to the state that Springfield in. In the original "New York, New York, It's A Hell of a Town!" the syntax is clearly "city, state." Let's apply that to "Springfield, Springfield." There you have it. The state that Springfield is in is... SPRINGFIELD! Think about how this applies to so many jokes used in the past. When Larry Burns asks, "Springfield? What state?" the conductor could very well be saying "That IS the state!" And so on. This is about as good as evidence and as close to an answer as we're ever going to get.
-- An XPeeple Production -- "As a child, I always wanted to bite his head off. This is my way of doing that... creatively." -Andy Dick as Marylin Manson "Most critics want to be authors, screenwriters and novelists, [but] they just suck." -Joe Rogan