| | Jefferson County | IA | 19101 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=JeffersonCounty+Iowa |
| | Keokuk County | IA | 19107 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KeokukCounty+IA |
| | Kossuth County | IA | 19109 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KossuthCounty+IA |
| | Louisa County | IA | 19115 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LouisaCounty+IA |
| | Lucas County | IA | 19117 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LucasCounty+IA |
| | Lyon County | IA | 19119 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=LyonCounty+IA |
| | Marshall County | IA | 19127 | | Marshalltown, IA 32260 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MarshallCounty+IA |
| | Mitchell County | IA | 19131 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MitchellCounty+IA |
| | Monona County | IA | 19133 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=MononaCounty+IA |
| | Monroe County | IA | 19135 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MonroeCounty+IA |