| | Christian County | IL | 17021 | | Taylorville, IL 45380 | Springfield-Jacksonville-Lincoln,
IL 522 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ChristianCounty+IL |
| | Logan County | IL | 17107 | | Lincoln, IL 30660 | Springfield-Jacksonville-Lincoln,
IL 522 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LoganCounty+IL |
| | Menard County | IL | 17129 | | Springfield, IL 44100 | Springfield-Jacksonville-Lincoln,
IL 522 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=MenardCounty+IL |
| | Morgan County | IL | 17137 | | Jacksonville, IL 27300 | Springfield-Jacksonville-Lincoln,
IL 522 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MorganCounty+IL |
| | Sangamon County | IL | 17167 | | Springfield, IL 44100 | Springfield-Jacksonville-Lincoln,
IL 522 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=SangamonCounty+IL |
| | Scott County | IL | 17171 | | Jacksonville, IL 27300 | Springfield-Jacksonville-Lincoln,
IL 522 | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ScottCounty+IL |