| | Greene County | IN | 18055 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=GreeneCounty+IN |
| | Jay County | IN | 18075 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=JayCounty+IN |
| | Jefferson County | IN | 18077 | | Madison, IN 31500 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=JeffersonCounty+IN |
| | Jennings County | IN | 18079 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=JenningsCounty+Indiana |
| | Knox County | IN | 18083 | | Vincennes, IN 47180 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=KnoxCounty+IN |
| | LaGrange County | IN | 18087 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LaGrangeCounty+IN |
| | Martin County | IN | 18101 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=MartinCounty+IN |
| | Orange County | IN | 18117 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=OrangeCounty+IN |
| | Parke County | IN | 18121 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ParkeCounty+IN |
| | Perry County | IN | 18123 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=PerryCounty+IN |