| | Wright County | IA | 19197 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=WrightCounty+IA |
| | Black Hawk County | IA | 19013 | | Waterloo-Cedar Falls, IA 47940 | | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BlackHawkCounty+IA |
| | Buena Vista County | IA | 19021 | | Storm Lake, IA 44740 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=BuenaVistaCounty+IA |
| | Carroll County | IA | 19027 | | Carroll, IA 16140 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CarrollCounty+IA |
| | Cerro Gordo County | IA | 19033 | | Mason City, IA 32380 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CerroGordoCounty+IA |
| | Clay County | IA | 19041 | | Spencer, IA 43980 | Spencer-Spirit Lake, IA 517 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ClayCounty+IA |
| | Clinton County | IA | 19045 | | Clinton, IA 17540 | Davenport-Moline, IA-IL 209 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ClintonCounty+IA |
| | Dallas County | IA | 19049 | | Des Moines-West Des
Moines, IA 19780 | Des Moines-West Des
Moines-Ames, IA 218 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DallasCounty+IA |
| | Des Moines County | IA | 19057 | | Burlington, IA-IL 15460 | Burlington-Fort Madison,
IA-IL 161 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=DesMoinesCounty+IA |
| | Dickinson County | IA | 19059 | | Spirit Lake, IA 44020 | Spencer-Spirit Lake, IA 517 | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=DickinsonCounty+IA |