Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Kay County | 9 | 43 |
| Kiowa County | 1 | 3 |
| Latimer County | 2 | 21 |
| Le Flore County | 21 | 162 |
| Lincoln County | 1 | 1 |
| Logan County | 1 | 1 |
| Marshall County | 1 | 1 |
| Mayes County | 7 | 14 |
| McClain County | 1 | 2 |
| McCurtain County | 27 | 97 |
| McIntosh County | 2 | 7 |
| Murray County | 2 | 6 |
| Muskogee County | 8 | 13 |
| Nowata County | 1 | 4 |
| Okfuskee County | 2 | 2 |
| Oklahoma County | 5 | 15 |
| Okmulgee County | 1 | 1 |
| Osage County | 12 | 39 |
| Ottawa County | 1 | 1 |
| Pittsburg County | 1 | 9 |
| Pottawatomie County | 2 | 2 |
| Pushmataha County | 9 | 76 |
| Roger Mills County | 9 | 38 |
| Seminole County | 1 | 2 |
| Sequoyah County | 11 | 34 |