| | | Knox County | KY | 21121 | | Corbin, KY 18340 | Middlesborough-Corbin, KY 371 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=KnoxCounty+Kentucky |
| | | Larue County | KY | 21123 | | Elizabethtown, KY 21060 | Louisville/Jefferson
County--Elizabethtown,
KY-IN 350 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=LarueCounty+KY |
| | | Laurel County | KY | 21125 | | Corbin, KY 18340 | Middlesborough-Corbin, KY 371 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LaurelCounty+Kentucky |
| | | Lawrence County | KY | 21127 | | Huntington-Ashland,
WV-KY-OH 26580 | Charleston-Huntington-Ashland,
WV-OH-KY 170 | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LawrenceCounty+KY |
| | | Lee County | KY | 21129 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LeeCounty+KY |
| | | Leslie County | KY | 21131 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=LeslieCounty+KY |
| | | Letcher County | KY | 21133 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=LetcherCounty+KY |
| | | Lewis County | KY | 21135 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=LewisCounty+KY |
| | | Lincoln County | KY | 21137 | | Danville, KY 19220 | | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LincolnCounty+KY |
| | | Livingston County | KY | 21139 | | Paducah, KY-IL 37140 | Paducah-Mayfield, KY-IL 424 | Outlying | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=LivingstonCounty+KY |
