Name Sites Samples
Dallas County 3 3
Dallas County 11 85
Dare County 8 21
Darlington County 1 2
Dauphin County 5 53
Davie County 1 3
Davis County 2 48
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 14
Decatur County 2 5
DeKalb County 1 2
DeKalb County 1 2
Delaware County 1 3
Delaware County 10 36
Delta County 16 95
Democratic Republic of the Congo 2 3
Denmark 284 1036
DeSoto County 2 9
Dewey County 2 7
DeWitt County 2 13
Dixie County 6 44
Dodge County 3 4
Dodge County 1 1
Douglas County 1 2
Drew County 5 7
Dutchess County 5 20