Ohio has approved 882 Utica shale permits.
Of that total, 542 wells have been drilled and 152 are in production in eastern Ohio, as of Sept. 7.
Those totals came from the Ohio Department of Natural Resources' Division of Oil & Gas Resources Management.
A total of 31 rigs are working in Ohio.
There were 14 new permits: seven in Carroll County, one in Guernsey County, three in Harrison County, one in Monroe County and two in Noble County.
Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.