| | Hamilton County | IL | 17065 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=HamiltonCounty+IL |
| | Hancock County | IL | 17067 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=HancockCounty+IL |
| | Hardin County | IL | 17069 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=HardinCounty+IL |
| | Henderson County | IL | 17071 | | Burlington, IA-IL 15460 | Burlington-Fort Madison,
IA-IL 161 | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=HendersonCounty+IL |
| | Iroquois County | IL | 17075 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=IroquoisCounty+IL |
| | Jasper County | IL | 17079 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=JasperCounty+IL |
| | Jefferson County | IL | 17081 | | Mount Vernon, IL 34500 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=JeffersonCounty+IL |
| | Jo Daviess County | IL | 17085 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=JoDaviessCounty+IL |
| | Johnson County | IL | 17087 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=JohnsonCounty+IL |
| | Knox County | IL | 17095 | | Galesburg, IL 23660 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=KnoxCounty+IL |