I'm pretty sure that the whole coastline was affected.
Well, I've never really cared to look into it, but the way I remember it being described on the news when it happened was "the entire eastern coastline" to which I assumed from the southern tip of Florida, to the northern tip of Montreal. This was, as I said, making assumptions without caring to investigate. I see now it looks a bit more like New York and the regions slightly north and west of New York, New England, and parts of Canada.