| | Delaware County | OK | 40041 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=DelawareCounty+OK |
| | Dewey County | OK | 40043 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=DeweyCounty+OK |
| | Ellis County | OK | 40045 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=EllisCounty+OK |
| | Garfield County | OK | 40047 | | Enid, OK 21420 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=GarfieldCounty+OK |
| | Garvin County | OK | 40049 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=GarvinCounty+OK |
| | Grady County | OK | 40051 | | Oklahoma City, OK 36420 | Oklahoma City-Shawnee, OK 416 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=GradyCounty+OK |
| | Grant County | OK | 40053 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=GrantCounty+OK |
| | Greer County | OK | 40055 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=GreerCounty+OK |
| | Harmon County | OK | 40057 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=HarmonCounty+OK |
| | Harper County | OK | 40059 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=HarperCounty+OK |