Name Sites Samples
Cass County 1 19
Cass County 5 11
Catahoula Parish 21 90
Cedar County 2 4
Chad 1 1
Chambers County 25 113
Charles City County 5 32
Charles County 10 19
Charlotte County 1 3
Chase County 1 4
Chatham County 21 53
Chatham County 5 14
Chautauqua County 1 3
Chautauqua County 2 19
Cheatham County 7 53
Cherokee County 4 4
Cherokee County 1 1
Cherokee County 2 4
Cheshire County 4 18
Chesterfield County 3 3
Chesterfield County 1 1
Chickasaw County 3 11
Chile 27 50
China 2 0
Chippewa County 3 14
Chippewa County 3 5
Chisago County 1 1
Choctaw County 1 1
Choctaw County 3 17
Choctaw County 4 11