| | Keith County | NE | 31101 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=KeithCounty+NE |
| | Keya Paha County | NE | 31103 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KeyaPahaCounty+NE |
| | Kimball County | NE | 31105 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=KimballCounty+NE |
| | Knox County | NE | 31107 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KnoxCounty+NE |
| | Lancaster County | NE | 31109 | | Lincoln, NE 30700 | Lincoln-Beatrice, NE 339 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=LancasterCounty+NE |
| | Lincoln County | NE | 31111 | | North Platte, NE 35820 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LincolnCounty+NE |
| | Logan County | NE | 31113 | | North Platte, NE 35820 | | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=LoganCounty+NE |
| | Loup County | NE | 31115 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=LoupCounty+NE |
| | Madison County | NE | 31119 | | Norfolk, NE 35740 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MadisonCounty+NE |
| | McPherson County | NE | 31117 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=McPhersonCounty+NE |