-- Springfield was named after Springfield, Oregon. The only reason is that when I was a kid, the TV show Father Knows Best took place in the town of Springfield, and I was thrilled because I imagined that it was the town next to Portland, my hometown. When I grew up, I realized it was just a fictitious name. I also figured out that Springfield was one of the most common names for a city in the U.S. In anticipation of the success of the show, I thought, This will be cool; everyone will think its their Springfield. And they do.
-- I dont want to ruin it for people, you know? Whenever people say its Springfield, Ohio, or Springfield, Massachusetts, or Springfield, wherever, I always go, Yup, thats right.
Conclusion: Intentionally left vague in show but the creator had a state in mind.
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No locked doors, no windows barred. No more things to make my brain seem SKARD. Look at Mr. Technical over here >.> -BTB