| | | Adair County | IA | 19001 | | | | | not in metro; pop <
5k; metro-adjacent | nonspecialized | https://maps.google.com/?q=AdairCounty+IA |
| | | Adams County | IA | 19003 | | | | | not in metro; pop <
5k; non-metro-adjacent | manufacturing-dependent | https://maps.google.com/?q=AdamsCounty+IA |
| | | Allamakee County | IA | 19005 | | | | | not in metro; pop <
5k; metro-adjacent | nonspecialized | https://maps.google.com/?q=AllamakeeCounty+IA |
| | | Appanoose County | IA | 19007 | | | | | not in metro; pop > 5K
< 20k;
non-metro-adjacent | nonspecialized | https://maps.google.com/?q=AppanooseCounty+IA |
| | | Audubon County | IA | 19009 | | | | | not in metro; pop <
5k; non-metro-adjacent | farm-dependent | https://maps.google.com/?q=AudubonCounty+IA |
| | | Black Hawk County | IA | 19013 | | Waterloo-Cedar Falls, IA 47940 | | Central | in metro of < 250k | manufacturing-dependent | https://maps.google.com/?q=BlackHawkCounty+IA |
| | | Bremer County | IA | 19017 | | Waterloo-Cedar Falls, IA 47940 | | Outlying | in metro of < 250k | nonspecialized | https://maps.google.com/?q=BremerCounty+IA |
| | | Buchanan County | IA | 19019 | | | | | not in metro; pop > 5k
< 20k; metro-adjacent | nonspecialized | https://maps.google.com/?q=BuchananCounty+IA |
| | | Buena Vista County | IA | 19021 | | Storm Lake, IA 44740 | | Central | not in metro; pop > 5K
< 20k;
non-metro-adjacent | manufacturing-dependent | https://maps.google.com/?q=BuenaVistaCounty+IA |
| | | Butler County | IA | 19023 | | | | | not in metro; pop <
5k; metro-adjacent | farm-dependent | https://maps.google.com/?q=ButlerCounty+IA |
