| | Mercer County | OH | 39107 | | Celina, OH 16380 | Lima-Van Wert-Celina, OH 338 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MercerCounty+OH |
| | Van Wert County | OH | 39161 | | Van Wert, OH 46780 | Lima-Van Wert-Celina, OH 338 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=VanWertCounty+OH |
| | Hancock County | OH | 39063 | | Findlay, OH 22300 | Findlay-Tiffin, OH 248 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=HancockCounty+OH |
| | Seneca County | OH | 39147 | | Tiffin, OH 45660 | Findlay-Tiffin, OH 248 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=SenecaCounty+OH |
| | Champaign County | OH | 39021 | | Urbana, OH 46500 | Dayton-Springfield-Kettering,
OH 212 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ChampaignCounty+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 |
| | Darke County | OH | 39037 | | Greenville, OH 24820 | Dayton-Springfield-Kettering,
OH 212 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=DarkeCounty+OH |
| | Greene County | OH | 39057 | | Dayton-Kettering-Beavercreek,
OH 19430 | Dayton-Springfield-Kettering,
OH 212 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=GreeneCounty+OH |
| | Miami County | OH | 39109 | | Dayton-Kettering-Beavercreek,
OH 19430 | Dayton-Springfield-Kettering,
OH 212 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=MiamiCounty+OH |
| | Montgomery County | OH | 39113 | | Dayton-Kettering-Beavercreek,
OH 19430 | Dayton-Springfield-Kettering,
OH 212 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=MontgomeryCounty+OH |