| | | 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 |
| | | Black Hawk County | IA | 19013 | | Waterloo-Cedar Falls, IA 47940 | | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BlackHawkCounty+IA |
| | | Bremer County | IA | 19017 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=BremerCounty+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 |
| | | Dubuque County | IA | 19061 | | Dubuque, IA 20220 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DubuqueCounty+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 |
| | | Harrison County | IA | 19085 | | Omaha, NE-IA 36540 | Omaha-Fremont, NE-IA 420 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=HarrisonCounty+IA |
| | | Johnson County | IA | 19103 | | Iowa City, IA 26980 | Cedar Rapids-Iowa City,
IA 168 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=JohnsonCounty+IA |
| | | Jones County | IA | 19105 | | Cedar Rapids, IA 16300 | Cedar Rapids-Iowa City,
IA 168 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=JonesCounty+IA |
