| | Washington County | KY | 21229 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=WashingtonCounty+KY |
| | Wayne County | KY | 21231 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=WayneCounty+KY |
| | Wolfe County | KY | 21237 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WolfeCounty+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 |
| | Bell County | KY | 21013 | | Middlesborough, KY 33180 | Middlesborough-Corbin, KY 371 | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=BellCounty+KY |
| | Boone County | KY | 21015 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BooneCounty+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 |
| | Boyle County | KY | 21021 | | Danville, KY 19220 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=BoyleCounty+KY |
| | Bullitt County | KY | 21029 | | Louisville/Jefferson
County, KY-IN 31140 | Louisville/Jefferson
County--Elizabethtown,
KY-IN 350 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BullittCounty+KY |
| | Calloway County | KY | 21035 | | Murray, KY 34660 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=CallowayCounty+KY |