They have been confirmed in these states so far: Pennsylvania, Ohio, New Jersey, Delaware, Connecticut, New York, Maryland, West Virginia, Virginia, and Oregon. But I have also heard Florida and California. PA is infested more than most, though...since it started in Allentown supposedly about 15 years ago. This year was the first time farmers reported significant damage to crops, so the story is getting much more attention now.
No natural predators in the US....so likely to be nationwide in a decade or so.
We've got them in NC and I've seen em in SC also - what a nuisance!