| | Pope County | IL | 17151 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=PopeCounty+IL |
| | Pulaski County | IL | 17153 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=PulaskiCounty+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 |
| | Union County | IL | 17181 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=UnionCounty+IL |
| | Williamson County | IL | 17199 | | Marion-Herrin, IL 32060 | Carbondale-Marion-Herrin,
IL 166 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=WilliamsonCounty+IL |
| | Boone County | IL | 17007 | | Rockford, IL 40420 | Rockford-Freeport-Rochelle,
IL 466 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BooneCounty+IL |
| | Cass County | IL | 17017 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=CassCounty+IL |
| | Clark County | IL | 17023 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ClarkCounty+IL |
| | Clay County | IL | 17025 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ClayCounty+IL |
| | Crawford County | IL | 17033 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=CrawfordCounty+IL |