| | | Black Hawk County | IA | 19013 | | Waterloo-Cedar Falls, IA 47940 | | Central | in metro of < 250k | manufacturing-dependent | https://maps.google.com/?q=BlackHawkCounty+IA |
| | | Boone County | IA | 19015 | | Ames, IA 11180 | Des Moines-West Des
Moines-Ames, IA 218 | Outlying | in metro of < 250k | nonspecialized | https://maps.google.com/?q=BooneCounty+Iowa |
| | | Bremer County | IA | 19017 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | in metro of < 250k | nonspecialized | https://maps.google.com/?q=BremerCounty+IA |
| | | Dubuque County | IA | 19061 | | Dubuque, IA 20220 | | Central | in metro of < 250k | nonspecialized | https://maps.google.com/?q=DubuqueCounty+IA |
| | | Grundy County | IA | 19075 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | in metro of < 250k | farm-dependent | https://maps.google.com/?q=GrundyCounty+IA |
| | | Johnson County | IA | 19103 | | Iowa City, IA 26980 | Cedar Rapids-Iowa City,
IA 168 | Central | in metro of < 250k | federal/state
government-dependent | https://maps.google.com/?q=JohnsonCounty+IA |
| | | Story County | IA | 19169 | | Ames, IA 11180 | Des Moines-West Des
Moines-Ames, IA 218 | Central | in metro of < 250k | federal/state
government-dependent | https://maps.google.com/?q=StoryCounty+IA |
| | | Washington County | IA | 19183 | | Iowa City, IA 26980 | Cedar Rapids-Iowa City,
IA 168 | Outlying | in metro of < 250k | nonspecialized | https://maps.google.com/?q=WashingtonCounty+IA |
| | | Woodbury County | IA | 19193 | | Sioux City, IA-NE-SD 43580 | Sioux City-Le Mars,
IA-NE-SD 512 | Central | in metro of < 250k | nonspecialized | https://maps.google.com/?q=WoodburyCounty+IA |
| | | Benton County | IA | 19011 | | Cedar Rapids, IA 16300 | Cedar Rapids-Iowa City,
IA 168 | Outlying | in metro of > 250k
< 1m | nonspecialized | https://maps.google.com/?q=BentonCounty+IA |
