| | Dallam County | TX | 48111 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DallamCounty+TX |
| | Dawson County | TX | 48115 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DawsonCounty+Texas |
| | Delta County | TX | 48119 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=DeltaCounty+TX |
| | DeWitt County | TX | 48123 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DeWittCounty+TX |
| | Dickens County | TX | 48125 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=DickensCounty+TX |
| | Dimmit County | TX | 48127 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=DimmitCounty+TX |
| | Donley County | TX | 48129 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=DonleyCounty+TX |
| | Duval County | TX | 48131 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=DuvalCounty+TX |
| | Eastland County | TX | 48133 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=EastlandCounty+TX |
| | Edwards County | TX | 48137 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=EdwardsCounty+TX |