Locations
| Name | Sites | Samples |
|---|---|---|
| Blount County | 1 | 2 |
| Blount County | 3 | 43 |
| Bolivar County | 1 | 8 |
| Bolivia | 4 | 28 |
| Boone County | 1 | 6 |
| Bosnia and Herzegovina | 7 | 16 |
| Bosque County | 4 | 35 |
| Botetourt County | 5 | 29 |
| Bottineau County | 1 | 1 |
| Bourbon County | 3 | 5 |
| Bowie County | 5 | 26 |
| Bradley County | 1 | 1 |
| Bradley County | 1 | 1 |
| Brazil | 187 | 450 |
| Brevard County | 15 | 85 |
| Brewster County | 52 | 157 |
| Bristol County | 1 | 1 |
| Broward County | 9 | 19 |
| Brown County | 1 | 2 |
| Brown County | 17 | 40 |
| Brunswick County | 1 | 1 |
| Bryan County | 4 | 7 |
| Buchanan County | 1 | 3 |
| Buckingham County | 1 | 1 |
| Bulgaria | 9 | 39 |
| Bullock County | 1 | 1 |
| Buncombe County | 9 | 29 |
| Burke County | 1 | 5 |
| Burke County | 1 | 2 |
| Burleigh County | 4 | 65 |