| | Adair County | KY | 21001 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AdairCounty+KY |
| | Anderson County | KY | 21005 | | Frankfort, KY 23180 | Lexington-Fayette--Richmond--Frankfort,
KY 336 | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=AndersonCounty+KY |
| | Ballard County | KY | 21007 | | Paducah, KY-IL 37140 | Paducah-Mayfield, KY-IL 424 | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=BallardCounty+KY |
| | Barren County | KY | 21009 | | Glasgow, KY 23980 | Bowling
Green-Glasgow-Franklin,
KY 150 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=BarrenCounty+KY |
| | Bath County | KY | 21011 | | Mount Sterling, KY 34460 | Lexington-Fayette--Richmond--Frankfort,
KY 336 | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=BathCounty+KY |
| | Bell County | KY | 21013 | | Middlesborough, KY 33180 | Middlesborough-Corbin, KY 371 | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=BellCounty+KY |
| | Boyle County | KY | 21021 | | Danville, KY 19220 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=BoyleCounty+KY |
| | Breathitt County | KY | 21025 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=BreathittCounty+KY |
| | Breckinridge County | KY | 21027 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=BreckinridgeCounty+KY |
| | Caldwell County | KY | 21033 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CaldwellCounty+KY |