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.
Carroll County remains the Ohio Utica shale drilling hot spot with 134 permits approved by the Ohio Department of Natural Resources.
The latest data was released on Monday for the week of Sept. 2.
Of the Carroll County wells, 42 are drilled, 16 are producing, 3 have been fracked and 16 are waiting to be fracked, according to the Division of Oil and Gas Resources Management.
Columbiana County is No. 2 with 49 drilling permits.
Harrison County has 32; Jefferson County, 28; Monroe County, 17; Mahoning and Guernsey counties, 13; and Stark and Noble, 12.
Locally, Portage has eight permits; and Medina and Wayne, each have one.
Holmes County got its first permit. Devon Energy has been approved for a well in Prairie Township.