| | Saline County | IL | 17165 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SalineCounty+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 |
| | Richland County | IL | 17159 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=RichlandCounty+IL |
| | Randolph County | IL | 17157 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=RandolphCounty+IL |
| | Putnam County | IL | 17155 | | Ottawa, IL 36837 | Chicago-Naperville,
IL-IN-WI 176 | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=PutnamCounty+Illinois |
| | Pulaski County | IL | 17153 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=PulaskiCounty+IL |
| | Pope County | IL | 17151 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=PopeCounty+IL |
| | Pike County | IL | 17149 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=PikeCounty+IL |
| | Piatt County | IL | 17147 | | Champaign-Urbana, IL 16580 | Champaign-Urbana-Denville,
IL 169 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=PiattCounty+IL |
| | Perry County | IL | 17145 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=PerryCounty+IL |