Locations
| Name | Sites | Samples |
|---|---|---|
| Fentress County | 1 | 2 |
| Fillmore County | 1 | 3 |
| Flagler County | 1 | 1 |
| Florence County | 2 | 3 |
| Fluvanna County | 2 | 10 |
| Foard County | 4 | 8 |
| Forest County | 2 | 7 |
| Forrest County | 2 | 6 |
| Forsyth County | 1 | 1 |
| Forsyth County | 2 | 7 |
| Fort Bend County | 5 | 14 |
| France | 1884 | 7307 |
| Franklin County | 12 | 24 |
| Franklin County | 12 | 32 |
| Franklin County | 4 | 8 |
| Franklin County | 11 | 41 |
| Franklin County | 1 | 1 |
| Franklin Parish | 5 | 10 |
| Frederick County | 1 | 1 |
| Freestone County | 11 | 67 |
| Fulton County | 4 | 5 |
| Gadsden County | 2 | 10 |
| Gage County | 1 | 5 |
| Gaines County | 1 | 5 |
| Galveston County | 16 | 89 |
| Garden County | 2 | 36 |
| Garrard County | 2 | 5 |
| Gaston County | 2 | 8 |
| Genesee County | 3 | 62 |
| Gentry County | 2 | 3 |