| | | Trigg County | KY | 21221 | | Clarksville, TN-KY 17300 | | Outlying | metro county (urban) | recreation | https://maps.google.com/?q=TriggCounty+KY |
| | | Trimble County | KY | 21223 | | | | | metro county (urban) | farm-dependent | https://maps.google.com/?q=TrimbleCounty+KY |
| | | Union County | KY | 21225 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=UnionCounty+KY |
| | | 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 |
| | | Allen County | KY | 21003 | | Bowling Green, KY 14540 | Bowling
Green-Glasgow-Franklin,
KY 150 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=AllenCounty+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 |
| | | Butler County | KY | 21031 | | Bowling Green, KY 14540 | Bowling
Green-Glasgow-Franklin,
KY 150 | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=ButlerCounty+KY |
| | | Edmonson County | KY | 21061 | | Bowling Green, KY 14540 | Bowling
Green-Glasgow-Franklin,
KY 150 | Outlying | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=EdmonsonCounty+KY |
