| | | 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 |
| | | Bond County | IL | 17005 | | St. Louis, MO-IL 41180 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Outlying | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=BondCounty+IL |
| | | Calhoun County | IL | 17013 | | St. Louis, MO-IL 41180 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=CalhounCounty+IL |
| | | Clinton County | IL | 17027 | | St. Louis, MO-IL 41180 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=ClintonCounty+IL |
| | | Jersey County | IL | 17083 | | St. Louis, MO-IL 41180 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=JerseyCounty+IL |
| | | Macoupin County | IL | 17117 | | St. Louis, MO-IL 41180 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MacoupinCounty+IL |
| | | Madison County | IL | 17119 | | St. Louis, MO-IL 41180 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=MadisonCounty+IL |
| | | Marion County | IL | 17121 | | Centralia, IL 16460 | St. Louis-St.
Charles-Farmington, MO-IL 476 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MarionCounty+IL |
