| | Clay County | KY | 21051 | | Corbin, KY 18340 | Middlesborough-Corbin, KY 371 | Outlying | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ClayCounty+KY |
| | Clinton County | KY | 21053 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ClintonCounty+KY |
| | Crittenden County | KY | 21055 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CrittendenCounty+KY |
| | Cumberland County | KY | 21057 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CumberlandCounty+KY |
| | Elliott County | KY | 21063 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ElliottCounty+KY |
| | Estill County | KY | 21065 | | Richmond-Berea, KY 40080 | Lexington-Fayette--Richmond--Frankfort,
KY 336 | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=EstillCounty+KY |
| | Fleming County | KY | 21069 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=FlemingCounty+KY |
| | Floyd County | KY | 21071 | | Pikeville, KY 38210 | | Outlying | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=FloydCounty+KY |
| | Franklin County | KY | 21073 | | Frankfort, KY 23180 | Lexington-Fayette--Richmond--Frankfort,
KY 336 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=FranklinCounty+KY |
| | Fulton County | KY | 21075 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=FultonCounty+Kentucky |