Surname D
| SURNAME | TOWNSHIP | RESEARCHER |
| Dalziel | Grant & Warren | Carleen Brown |
| Dalziel | Warren | Michelle Davis |
| Daniels | Antioch | Nancy Rudolph |
| Dart | Pete Velsko | |
| Davis | Wauconda ca 1990s | Gay Wickersham Davis |
| Davis | Janice Lynn | |
| Davison | Cuba | Toni Mann |
| DeLoof | Max G. & Donna Kearse | |
| Demlow | Sandy Demlow | |
| Demmon | Warren | Elisabeth Demmon |
| DeVine | Harriett DeVine | |
| Dietrich | Lake Bluff | Roger Peterson |
| Dilger | Steve Regul | |
| Dillon | Laura L. Riley | |
| Doremus | Libertyville | Marietta Peterson |
| Dorfler | Ivanhoe, Fremont Center, ca 1868-1915; Libertyville, Mundelein | Cindy Dorfler-Hederer |
| Dowst | Waukegan & Warren Twp. | Janice Buchanan |
| Dowst | India Grow | |
| Doyle | Don Finel | |
| Drennen | Waukegan -- 1950 & earlier | Kenneth L. Drennen |
| Duffy | Shields Twp., 1840-1844 | Catherine Green |
| Duffy | Deerfield - 1865 | Bonnie Duffy |
| Duggan | Fremont & Waukegan | Cathy Sheehan |
| Dutcher | Wauconda -- 1850 | B.J. (Dutcher) Creager |
| Dutcher | Wendy | |
| Dyke | Antioch | Pam Hillman |
| Dymond | Lake Zurich, Waukegan | Char |