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.
The Ohio Department of Natural Resources' Division of Oil and Gas Resources Management has approved 405 Utica shale permits in Ohio.
That is an increase of 23 since the last state filing.
To date, 171 of those wells have been drilled in eastern Ohio.
That's grown by 27 wells from 144 wells since the last state filing two weeks ago.
The listing was released Wednesday.
The permits have been issued since late 2009.
Carroll County is No. 1 with permits: 140. That is nearly 35 percent of the state total.
Other county permit totals: Columbiana, 55; Harrison, 49; Jefferson, 31;Guernsey, 24; Monroe, 18; Mahoning, 14; Stark, 13; Portage, 13; Noble, 13;and Belmont, 10.
Locally, Medina and Wayne counties each have one permit.
Ohio has also approved 16 permits in the Marcellus shale, of which six wells have been drilled.