>>90561823It takes place in a fictional city called Sherman, that's mostly based on Chicago, but takes influences from other places. There is an actual Sherman Il, but SBT very clearly does not take place there.
While it's clearly on one of the great lakes, the surrounding area is hilly and densely forested, I'd probably place Sherman somewhere on lake Eerie, around upstate New York, Pennsylvania, or Ohio.
In any case, there's no canonical state for it, so it doesn't go on the map.