Locations
| Name | Sites | Samples |
|---|---|---|
| Sheridan County | 2 | 5 |
| Sherman County | 4 | 15 |
| Sherman County | 3 | 8 |
| Shiawassee County | 1 | 1 |
| Sioux County | 3 | 10 |
| Slovakia | 40 | 69 |
| Slovenia | 10 | 38 |
| Smith County | 3 | 13 |
| Smith County | 17 | 94 |
| Smyth County | 4 | 17 |
| Somerset County | 8 | 33 |
| Somervell County | 2 | 4 |
| Southampton County | 5 | 12 |
| Spain | 389 | 1374 |
| Spalding County | 3 | 3 |
| Spartanburg County | 1 | 1 |
| Spencer County | 5 | 16 |
| Spotsylvania County | 2 | 3 |
| St. Bernard Parish | 10 | 29 |
| St. Charles Parish | 5 | 34 |
| St. Francois County | 3 | 6 |
| St. Helena Parish | 2 | 7 |
| St. James Parish | 1 | 6 |
| St. John the Baptist Parish | 1 | 16 |
| St. Landry Parish | 4 | 14 |
| St. Louis County | 5 | 15 |
| St. Lucie County | 3 | 13 |
| St. Tammany Parish | 8 | 24 |
| Stafford County | 1 | 9 |
| Stanly County | 1 | 1 |