| | Saline County | IL | 17165 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SalineCounty+IL |
| | Schuyler County | IL | 17169 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SchuylerCounty+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 |
| | Shelby County | IL | 17173 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ShelbyCounty+IL |
| | Stephenson County | IL | 17177 | | Freeport, IL 23300 | Rockford-Freeport-Rochelle,
IL 466 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=StephensonCounty+IL |
| | Union County | IL | 17181 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=UnionCounty+IL |
| | Wabash County | IL | 17185 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=WabashCounty+IL |
| | Warren County | IL | 17187 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=WarrenCounty+IL |
| | Washington County | IL | 17189 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WashingtonCounty+IL |
| | Wayne County | IL | 17191 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WayneCounty+IL |