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Many fans say "Behind the Laughter" definitively noted that Springfield was in Kentucky, per the narrator. But in repeats of that episode, the narrator said Springfield was in Missouri.Background
According to interviews and The Simpsons Archive FAQ, Matt Groening chose the name "Springfield" simply because it is one of the most common city names in the United States.But Groening and the writers have enjoyed teasing fans with clues as to where the town might be located.

