| | | Logan County | OH | 39091 | | Bellefontaine, OH 13340 | Columbus-Marion-Zanesville,
OH 198 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LoganCounty+OH |
| | | Madison County | OH | 39097 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MadisonCounty+OH |
| | | Marion County | OH | 39101 | | Marion, OH 32020 | Columbus-Marion-Zanesville,
OH 198 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MarionCounty+OH |
| | | Morrow County | OH | 39117 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MorrowCounty+OH |
| | | Muskingum County | OH | 39119 | | Zanesville, OH 49780 | Columbus-Marion-Zanesville,
OH 198 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MuskingumCounty+OH |
| | | Perry County | OH | 39127 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=PerryCounty+OH |
| | | Pickaway County | OH | 39129 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=PickawayCounty+OH |
| | | Ross County | OH | 39141 | | Chillicothe, OH 17060 | Columbus-Marion-Zanesville,
OH 198 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=RossCounty+OH |
| | | Union County | OH | 39159 | | Columbus, OH 18140 | Columbus-Marion-Zanesville,
OH 198 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=UnionCounty+OH |
| | | Ashtabula County | OH | 39007 | | Cleveland, OH 17410 | Cleveland-Akron-Canton,
OH 184 | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=AshtabulaCounty+Ohio |
