| | | Adair County | KY | 21001 | | | | Non-metropolitan | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AdairCounty+KY |
| | | Allen County | KY | 21003 | | Bowling Green, KY 14540 | Bowling Green-Glasgow, KY 150 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=AllenCounty+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, 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 | | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=BellCounty+KY |
| | | Boone County | KY | 21015 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington-Maysville,
OH-KY-IN 178 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BooneCounty+KY |
| | | Bourbon County | KY | 21017 | | Lexington-Fayette, KY 30460 | Lexington-Fayette--Richmond--Frankfort,
KY 336 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=BourbonCounty+KY |
| | | Boyd County | KY | 21019 | | Huntington-Ashland,
WV-KY-OH 26580 | Charleston-Huntington-Ashland,
WV-OH-KY 170 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BoydCounty+KY |
