| | Dubuque County | IA | 19061 | | Dubuque, IA 20220 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DubuqueCounty+IA |
| | Emmet County | IA | 19063 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=EmmetCounty+IA |
| | Fayette County | IA | 19065 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=FayetteCounty+IA |
| | Floyd County | IA | 19067 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=FloydCounty+IA |
| | Franklin County | IA | 19069 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=FranklinCounty+IA |
| | Fremont County | IA | 19071 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=FremontCounty+IA |
| | Greene County | IA | 19073 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=GreeneCounty+IA |
| | Grundy County | IA | 19075 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=GrundyCounty+IA |
| | Guthrie County | IA | 19077 | | Des Moines-West Des
Moines, IA 19780 | Des Moines-West Des
Moines-Ames, IA 218 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=GuthrieCounty+IA |
| | Hamilton County | IA | 19079 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=HamiltonCounty+IA |