The infestation area of Asian longhorned beetles in Ohio seems to be limited to Bethel, Ohio, a town about 30 miles southeast of Cincinnati. The infested area is now under quarantine, and the news articles I've been seeing indicate an infestation that is around 3 to 5 years old. Of course, we are trying to keep up to date on this! Here is the central link for Ohio's Department of Agriculture Asian longhorned beetle page... http://www.agri.ohio.gov/TopNews/asianbeetle/
Remember, up until a few weeks ago nobody knew these beetles were out there. The pests you don't know about are just as bad as the ones you DO know about, so don't move firewood and be tree aware!
For the official USDA APHIS press release, see http://www.aphis.usda.gov/newsroom/2011/06/adult_detection_ALB.shtml