The Ohio Department of Natural Resources has approved 927 Utica shale permits, as of Oct. 12.
Of that total, 577 wells are completed and 164 wells are in production.
A total of 30 rigs are working in Ohio.
Thirteen new permits were approved: one in Belmont County, two in Carroll County, five in Harrison County, two in Monroe County, two in Trumbull County and one in Washington 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.