Here are Ohio's Top 10 gas-producing counties in calendar year 2013, based on data from the Ohio Department of Natural Resources:
1. Carroll, 50.2 billion cubic feet of natural gas.
2. Harrison, 12.7 billion.
3. Belmont, 12.4 billion.
4. Monroe, 9.7 billion.
5. Noble, 4.3 billion.
6. Jefferson, 4.2 billion.
7. Columbiana, 3 billion.
8. Guernsey, 2.1 billion.
9. Mahoning, 714 million.
10. Washington, 315 million.
Two local counties made the list: Stark was No. 11 with 196 million cubic feet and Portage was No. 14 with 20.2 million cubic feet.
Only 14 Ohio counties reported natural gas production in 2013. The other counties were Trumbull, Tuscarawas and Muskingum.
With thanks to co-worker Rick Armon.
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.