Public Sites
| State | County | Name |
|---|---|---|
| South Dakota | Custer | Custer State Park |
| Iowa | Buchanan | Cutshaw Bridge State Access Area |
| Iowa | Palo Alto | Cylinder |
| Iowa | Palo Alto | Cylinder Creek @ 320th Street |
| Iowa | Ida | Dale Lacey Fen |
| Iowa | Madison | Dale Maffitt Reservoir |
| Iowa | Dallas | Dallas Center |
| Iowa | Dallas | Dallas County |
| South Dakota | Lawrence | Dalton Lake |
| Iowa | Jackson | Dalton Pond State Fishing Access Area |
| Iowa | Clay | Dan Green Slough Wildlife Area |
| Iowa | Woodbury | Danbury |
| Iowa | Carroll | Daniel Davis Timber |
| Iowa | Johnson | Daniels Circle NE |
| Iowa | Chickasaw | Daubendiek Prairie |
| Alabama | Mobile | Dauphin Island West |
| Alabama | Mobile | Dauphin Island, Cadillac Park |
| Alabama | Mobile | Dauphin Island--Audubon Bird Sanctuary |
| Alabama | Mobile | Dauphin Island--Shell Mound Park |
| Alabama | Mobile | Dauphin Island-708 Bienville Blvd Cemetery |
| Iowa | Scott | Davenport |
| Iowa | Davis | Davis County |
| Iowa | Decatur | Decatur County |
| Iowa | Decatur | Decatur Wildlife Management Area |
| Iowa | Winneshiek | Decorah Community Prairie |