| | Jefferson County | IA | 19101 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=JeffersonCounty+Iowa |
| | 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 |
| | Keokuk County | IA | 19107 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KeokukCounty+IA |
| | Kossuth County | IA | 19109 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KossuthCounty+IA |
| | Lee County | IA | 19111 | | Fort Madison, IA 22800 | Burlington-Fort Madison,
IA-IL 161 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LeeCounty+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 |
| | Louisa County | IA | 19115 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LouisaCounty+IA |
| | Lucas County | IA | 19117 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LucasCounty+IA |
| | Lyon County | IA | 19119 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=LyonCounty+IA |