| | Burt County | NE | 31021 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=BurtCounty+NE |
| | Butler County | NE | 31023 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ButlerCounty+NE |
| | Cass County | NE | 31025 | | Omaha, NE-IA 36540 | Omaha-Fremont, NE-IA 420 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=CassCounty+NE |
| | Cedar County | NE | 31027 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CedarCounty+NE |
| | Chase County | NE | 31029 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ChaseCounty+NE |
| | Cherry County | NE | 31031 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CherryCounty+NE |
| | Cheyenne County | NE | 31033 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CheyenneCounty+NE |
| | Clay County | NE | 31035 | | Hastings, NE 25580 | | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ClayCounty+NE |
| | Colfax County | NE | 31037 | | Columbus, NE 18100 | | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ColfaxCounty+NE |
| | Cuming County | NE | 31039 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CumingCounty+NE |