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 number of rigs actively exploring for oil and natural gas in the U.S. rose this week by eight, to 1,817.
In Ohio, that total remained at 26 from the previous week.
Texas-based oilfield services company Baker Hughes Inc. reported Wednesday that 1,388 rigs were exploring for oil and 428 were searching for gas. One was listed as miscellaneous.
A year ago, Baker Hughes counted 2,000 rigs. The tally, normally released on Friday, was advanced this week because of Thanksgiving.
Of the major oil- and gas-producing states, Louisiana gained five rigs, Pennsylvania gained four, Texas gained two and Alaska and New Mexico each gained one.
California lost three rigs while Arkansas, Colorado and Oklahoma each lost one. North Dakota, West Virginia and Wyoming were unchanged.
The rig count peaked at 4,530 in 1981 and bottomed at 488 in 1999.
Baker Hughes has Ohio at 26 rigs. The Ohio department of Natural resources said the number of rigs is actually jumped from 26 to 28.