| | | Henry County | IL | 17073 | | Davenport-Moline-Rock
Island, IA-IL 19340 | Davenport-Moline, IA-IL 209 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=HenryCounty+IL |
| | | Mercer County | IL | 17131 | | Davenport-Moline-Rock
Island, IA-IL 19340 | Davenport-Moline, IA-IL 209 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MercerCounty+IL |
| | | Rock Island County | IL | 17161 | | Davenport-Moline-Rock
Island, IA-IL 19340 | Davenport-Moline, IA-IL 209 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=RockIslandCounty+IL |
| | | Lee County | IL | 17103 | | Dixon, IL 19940 | Dixon-Sterling, IL 221 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LeeCounty+IL |
| | | Whiteside County | IL | 17195 | | Sterling, IL 44580 | Dixon-Sterling, IL 221 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=WhitesideCounty+IL |
| | | Massac County | IL | 17127 | | Paducah, KY-IL 37140 | Paducah-Mayfield, KY-IL 424 | Outlying | nonmetro county (rural) | recreation | https://maps.google.com/?q=MassacCounty+IL |
| | | Fulton County | IL | 17057 | | Canton, IL 15900 | Peoria-Canton, IL 427 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=FultonCounty+IL |
| | | Marshall County | IL | 17123 | | Peoria, IL 37900 | Peoria-Canton, IL 427 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=MarshallCounty+IL |
| | | Peoria County | IL | 17143 | | Peoria, IL 37900 | Peoria-Canton, IL 427 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=PeoriaCounty+IL |
| | | Stark County | IL | 17175 | | Peoria, IL 37900 | Peoria-Canton, IL 427 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=StarkCounty+IL |
