| | Adair County | OK | 40001 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=AdairCounty+OK |
| | Alfalfa County | OK | 40003 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AlfalfaCounty+OK |
| | Atoka County | OK | 40005 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AtokaCounty+OK |
| | Beaver County | OK | 40007 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=BeaverCounty+OK |
| | Blaine County | OK | 40011 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=BlaineCounty+OK |
| | Caddo County | OK | 40015 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CaddoCounty+OK |
| | Carter County | OK | 40019 | | Ardmore, OK 11620 | | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=CarterCounty+OK |
| | Cherokee County | OK | 40021 | | Tahlequah, OK 45140 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CherokeeCounty+OK |
| | Choctaw County | OK | 40023 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ChoctawCounty+OK |
| | Cimarron County | OK | 40025 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CimarronCounty+OK |