Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Laurel County | 2 | 3 |
| Lawrence County | 8 | 14 |
| Lee County | 6 | 33 |
| Letcher County | 2 | 5 |
| Lewis County | 6 | 7 |
| Livingston County | 9 | 19 |
| Logan County | 1 | 4 |
| Lyon County | 2 | 11 |
| Madison County | 5 | 14 |
| Magoffin County | 1 | 2 |
| Marion County | 1 | 1 |
| Marshall County | 6 | 29 |
| Martin County | 1 | 3 |
| Mason County | 3 | 19 |
| McCracken County | 6 | 19 |
| McCreary County | 7 | 12 |
| McLean County | 4 | 15 |
| Meade County | 1 | 2 |
| Menifee County | 7 | 53 |
| Mercer County | 1 | 7 |
| Montgomery County | 7 | 18 |
| Morgan County | 6 | 12 |
| Muhlenberg County | 3 | 6 |
| Nelson County | 1 | 1 |
| Ohio County | 5 | 23 |