| | 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 |
| | Linn County | IA | 19113 | | Cedar Rapids, IA 16300 | Cedar Rapids-Iowa City,
IA 168 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=LinnCounty+IA |
| | Lucas County | IA | 19117 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LucasCounty+IA |
| | Madison County | IA | 19121 | | Des Moines-West Des
Moines, IA 19780 | Des Moines-West Des
Moines-Ames, IA 218 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MadisonCounty+IA |
| | Mahaska County | IA | 19123 | | Oskaloosa, IA 36820 | Des Moines-West Des
Moines-Ames, IA 218 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MahaskaCounty+IA |
| | Montgomery County | IA | 19137 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MontgomeryCounty+IA |
| | Page County | IA | 19145 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=PageCounty+IA |
| | Polk County | IA | 19153 | | 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=PolkCounty+IA |
| | 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 |
| | Poweshiek County | IA | 19157 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=PoweshiekCounty+IA |