| | | Pottawattamie County | IA | 19155 | | Omaha, NE-IA 36540 | Omaha-Fremont, NE-IA 420 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=PottawattamieCounty+IA |
| | | Scott County | IA | 19163 | | Davenport-Moline-Rock
Island, IA-IL 19340 | Davenport-Moline, IA-IL 209 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ScottCounty+IA |
| | | Story County | IA | 19169 | | Ames, IA 11180 | Des Moines-West Des
Moines-Ames, IA 218 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=StoryCounty+IA |
| | | Wapello County | IA | 19179 | | Ottumwa, IA 36900 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=WapelloCounty+IA |
| | | Webster County | IA | 19187 | | Fort Dodge, IA 22700 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WebsterCounty+IA |
| | | Woodbury County | IA | 19193 | | Sioux City, IA-NE-SD 43580 | Sioux City-Le Mars,
IA-NE-SD 512 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=WoodburyCounty+IA |
| | | Benton County | IA | 19011 | | Cedar Rapids, IA 16300 | Cedar Rapids-Iowa City,
IA 168 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=BentonCounty+IA |
| | | Boone County | IA | 19015 | | Ames, IA 11180 | Des Moines-West Des
Moines-Ames, IA 218 | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=BooneCounty+Iowa |
| | | Bremer County | IA | 19017 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=BremerCounty+IA |
| | | Grundy County | IA | 19075 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=GrundyCounty+IA |
