Wait
He just said how he came up with the name of the town. He didn't give away the actual location. It's impossible for the Springfield featured in The Simpsons shows to be based on Springfield, Oregon. The Springfield in The Simpsons has all different types of landscapes that are clearly not native to Oregon.
Quote:
The interviewer (Claudia De La Roca, who’s worked on The Simpsons and Groening’s Futurama) then notes Groening has never revealed the town’s location before. The writer-producer replies, “I don’t want to ruin it for people, you know? Whenever people say it’s Springfield, Ohio, or Springfield, Massachusetts, or Springfield, wherever, I always go, ‘Yup, that’s right.’”
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That paragraph says he's never revealed the true location.