The Ohio Department of Natural Resources (ODNR) has released its 2012 Ohio Oil and Gas Summary (see here for a copy, including links to earlier editions). Among the highlights: "Carroll County was the most active county with 87 wells drilled (Table IV). Noble which had no wells drilled in 2011, was second with 49 wells. Knox and Stark counties, tied for first in 2011, remained in the top-ten dropping to fourth and fifth, respectively. The focus of drilling to the Utica/Point Pleasant shales was clearly seen in these top-ten counties. Every well in Harrison and all but one well in Carroll and Columbiana had these shales as the target. Additionally, many of these counties had stratigraphic test wells drilled in them which are not included in these totals."
There's a good deal of interesting information in the summary. Read it all.