| united states | delaware | agkistrodon contortrix | species | 0 | 1 |
| united states | georgia | agkistrodon contortrix | species | 0 | 1 |
| united states | kansas | agkistrodon contortrix | species | 2 | 2 |
| united states | kansas | agkistrodon contortrix phaeogaster | subspecies | 0 | 1 |
| united states | kentucky | agkistrodon contortrix | species | 0 | 2 |
| united states | louisiana | agkistrodon contortrix | species | 0 | 1 |
| united states | missouri | agkistrodon contortrix | species | 0 | 2 |
| united states | north carolina | agkistrodon contortrix | species | 0 | 2 |
| united states | ohio | agkistrodon contortrix | species | 18 | 0 |
| united states | texas | agkistrodon contortrix | species | 0 | 4 |
| united states | texas | agkistrodon contortrix phaeogaster | subspecies | 0 | 1 |