| | | Martin County | KY | 21159 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=MartinCounty+KY |
| | | Pendleton County | KY | 21191 | | Cincinnati, OH-KY-IN 17140 | Cincinnati-Wilmington,
OH-KY-IN 178 | Outlying | metro county (urban) | mining-dependent | https://maps.google.com/?q=PendletonCounty+KY |
| | | Perry County | KY | 21193 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=PerryCounty+KY |
| | | Pike County | KY | 21195 | | Pikeville, KY 38210 | | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=PikeCounty+KY |
| | | Union County | KY | 21225 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=UnionCounty+KY |
| | | Webster County | KY | 21233 | | Henderson, KY 25775 | Evansville-Henderson,
IN-KY 241 | Outlying | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=WebsterCounty+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 |
