From the Far, Far Too Much Free Time On His Hands Files.
A Changeverse fan has drawn up a Deathzone map of the U.S., basing it on Steve's theory that the post-Change dislocations would destroy everything within a certain radius of metro areas bigger than 50,000 people (I forget the precise ratio of population to mileage).
Hair-raising, especially given where I live now. Leaving aside the fictional/fantastic horror of the novels, there's always the sobering real-world nightmares like the impact of electromagnetic pulse attacks (make sure to take the time to read and print this one--I have). I've always been strangely drawn to the Upper Peninsula, and now I am getting an inkling why.
More seriously: as regards electronics and electrical generation and transmission, an EMP assault is the functional equivalent of the Change, and would quickly leave us facing many of the same scenarios.
Have a great day!