Ohio has approved 841 Utica shale permits, as of Aug. 10.
Of that total, 502 wells have been drilled and 125 wells are in production.
A total of 34 drilling rigs are in Ohio, says the Ohio Department of Natural Resources' Division of Oil and Gas Resources Management.
The newest 14 permits are six in Carroll County, three in Guernsey County, two in Harrison County, one in Noble County and two in Trumbull 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.