If you are a paying member of Project-GC then go to:
Project-GC > Tools > Map Counties.
Here are your results:
Adams County (OH) 0
Allen County (OH) 0
Ashland County (OH) 0
Ashtabula County (OH) 54
Athens County (OH) 0
Auglaize County (OH) 0
Belmont County (OH) 0
Brown County (OH) 0
Butler County (OH) 0
Carroll County (OH) 0
Champaign County (OH) 0
Clark County (OH) 0
Clermont County (OH) 0
Clinton County (OH) 0
Columbiana County (OH) 4
Coshocton County (OH) 0
Crawford County (OH) 0
Cuyahoga County (OH) 294
Darke County (OH) 0
Defiance County (OH) 0
Delaware County (OH) 0
Erie County (OH) 0
Fairfield County (OH) 0
Fayette County (OH) 0
Franklin County (OH) 5
Fulton County (OH) 0
Gallia County (OH) 0
Geauga County (OH) 16
Greene County (OH) 0
Guernsey County (OH) 0
Hamilton County (OH) 0
Hancock County (OH) 0
Hardin County (OH) 0
Harrison County (OH) 0
Henry County (OH) 0
Highland County (OH) 0
Hocking County (OH) 0
Holmes County (OH) 0
Huron County (OH) 0
Jackson County (OH) 0
Jefferson County (OH) 0
Knox County (OH) 0
Lake County (OH) 12
Lawrence County (OH) 0
Licking County (OH) 0
Logan County (OH) 0
Lorain County (OH) 29
Lucas County (OH) 2
Madison County (OH) 0
Mahoning County (OH) 21
Marion County (OH) 0
Medina County (OH) 87
Meigs County (OH) 0
Mercer County (OH) 0
Miami County (OH) 0
Monroe County (OH) 0
Montgomery County (OH) 2
Morgan County (OH) 0
Morrow County (OH) 0
Muskingum County (OH) 0
Noble County (OH) 0
Ottawa County (OH) 0
Paulding County (OH) 0
Perry County (OH) 0
Pickaway County (OH) 0
Pike County (OH) 0
Portage County (OH) 307
Preble County (OH) 1
Putnam County (OH) 0
Richland County (OH) 24
Ross County (OH) 0
Sandusky County (OH) 1
Scioto County (OH) 0
Seneca County (OH) 0
Shelby County (OH) 0
Stark County (OH) 1292
Summit County (OH) 1536
Trumbull County (OH) 27
Tuscarawas County (OH) 22
Union County (OH) 0
Van Wert County (OH) 0
Vinton County (OH) 0
Warren County (OH) 0
Washington County (OH) 0
Wayne County (OH) 10
Williams County (OH) 1
Wood County (OH) 0
Wyandot County (OH) 0