The Simpsons mystery continues (Mustanggt350)

[The Deuce]

So everybody knows about Matt Groeing's little scam to make it totally ambiguous what State Springfield is in? Like the fact that they can go out to sea in one episode, and jump what looks like the Snake River Gorge in another.

I've heard that he is from San Luis Obispo, and that there were reactors like we see in town near his house. But I've recently seen two episodes that make me wonder if anybody has a good guess.

Here's what I saw.
1. Simpson's in Brazil. The little orphan boy tells Lisa he was going to send her a letter but didn't know what State she lived in. She said, "It's pretty obvious if you look at the clues." What clues?
2. The power plant has a softball team. They play a game that shows the following two towns on the scoreboard: Springfield (obviously) and Shelbyville. Yeah, like the former Avatar of a member.

I know this is pretty far from a muscle car topic, though Homer was seen driving a Superbird in a flashback episode. I'm interested to hear where people think they are located.