| | | Erie County | OH | 39043 | | Sandusky, OH 41780 | Cleveland-Akron-Canton,
OH 184 | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=ErieCounty+OH |
| | | Hocking County | OH | 39073 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Outlying | metro county (urban) | recreation | https://maps.google.com/?q=HockingCounty+OH |
| | | Ottawa County | OH | 39123 | | Sandusky, OH 41780 | Cleveland-Akron-Canton,
OH 184 | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=OttawaCounty+Ohio |
| | | Adams County | OH | 39001 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=AdamsCounty+OH |
| | | Allen County | OH | 39003 | | Lima, OH 30620 | Lima-Van Wert-Celina, OH 338 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=AllenCounty+OH |
| | | Ashland County | OH | 39005 | | Ashland, OH 11740 | Mansfield-Ashland-Bucyrus,
OH 360 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=AshlandCounty+OH |
| | | Brown County | OH | 39015 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=BrownCounty+OH |
| | | Butler County | OH | 39017 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ButlerCounty+OH |
| | | Carroll County | OH | 39019 | | Canton-Massillon, OH 15940 | Cleveland-Akron-Canton,
OH 184 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=CarrollCounty+OH |
| | | Clark County | OH | 39023 | | Springfield, OH 44220 | Dayton-Springfield-Kettering,
OH 212 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ClarkCounty+OH |
