Locations
| Name | Sites | Samples |
|---|---|---|
| Kleberg County | 10 | 15 |
| Knott County | 3 | 3 |
| Knox County | 2 | 6 |
| Kosciusko County | 1 | 2 |
| Kyrgyzstan | 0 | 0 |
| La Salle Parish | 1 | 3 |
| Lafayette County | 6 | 15 |
| Lafayette County | 2 | 3 |
| Lafayette County | 1 | 7 |
| Lafayette Parish | 1 | 2 |
| Lafourche Parish | 3 | 10 |
| Lake County | 10 | 52 |
| Lake County | 3 | 5 |
| Lake County | 2 | 6 |
| Lake County | 4 | 9 |
| Lamar County | 1 | 2 |
| Lamar County | 7 | 42 |
| Lamoille County | 2 | 9 |
| Lampasas County | 4 | 23 |
| Lancaster County | 4 | 9 |
| Lane County | 1 | 1 |
| Lanier County | 1 | 1 |
| Latimer County | 2 | 21 |
| Latvia | 1 | 4 |
| Lauderdale County | 2 | 8 |
| Laurel County | 2 | 3 |
| Laurens County | 2 | 2 |
| Lawrence County | 1 | 4 |
| Lawrence County | 2 | 6 |
| Lee County | 3 | 7 |