Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Atoka County | 14 | 34 |
| Beaver County | 8 | 48 |
| Beckham County | 4 | 20 |
| Blaine County | 3 | 6 |
| Bryan County | 1 | 3 |
| Caddo County | 10 | 93 |
| Canadian County | 1 | 7 |
| Cherokee County | 3 | 43 |
| Choctaw County | 4 | 11 |
| Cimarron County | 8 | 17 |
| Cleveland County | 2 | 8 |
| Coal County | 1 | 11 |
| Comanche County | 6 | 22 |
| Custer County | 10 | 29 |
| Delaware County | 11 | 30 |
| Dewey County | 2 | 7 |
| Ellis County | 1 | 2 |
| Garvin County | 20 | 63 |
| Grady County | 4 | 9 |
| Grant County | 1 | 3 |
| Greer County | 5 | 22 |
| Harper County | 8 | 38 |
| Haskell County | 6 | 25 |
| Hughes County | 1 | 2 |
| Jackson County | 2 | 4 |