| Name |
Sites |
Samples |
| Dallas County |
1 |
1 |
| Dallas County |
3 |
3 |
| Dallas County |
11 |
88 |
| Dare County |
8 |
21 |
| Darlington County |
1 |
2 |
| Dauphin County |
5 |
53 |
| Davie County |
1 |
3 |
| Davis County |
2 |
50 |
| Dawes County |
1 |
3 |
| Dawson County |
1 |
1 |
| Dawson County |
1 |
2 |
| De Baca County |
2 |
3 |
| De Soto Parish |
2 |
5 |
| Decatur County |
3 |
23 |
| Decatur County |
2 |
5 |
| DeKalb County |
1 |
2 |
| DeKalb County |
1 |
2 |
| Delaware County |
1 |
3 |
| Delaware County |
10 |
37 |
| Delta County |
16 |
95 |
| Democratic Republic of the Congo |
2 |
3 |
| Denmark |
284 |
1036 |
| DeSoto County |
2 |
10 |
| Dewey County |
2 |
7 |
| DeWitt County |
2 |
13 |
| Dixie County |
6 |
45 |
| Dodge County |
3 |
4 |
| Dodge County |
1 |
1 |
| Douglas County |
1 |
2 |
| Drew County |
5 |
7 |
