Jake lived in Idaho - It's not a huge part of the book, but it's described as mentioned.

"Corvallis had, a few minutes ago, picked Jake Forthrast up at the train station downtown. He was in his late forties—a straggler, much younger than the other three Forthrast siblings. He lived in northern Idaho, in a remote community of like-minded people, which was to say extreme libertarians with a religious bent. He had a wife and a brood of kids there."