Places beginning with DE in Illinois, United States
- Dearborn Homes (subdivision)
- Decatur
- Decatur, Township of
- Decker, Township of
- Decorra
- Deer Chase (subdivision)
- Deer Creek
- Deer Creek, Township of
- Deerfield
- Deerfield, Township of
- Deerfield, Township of
- Deer Grove
- Deering City
- Deer Lake
- Deer Lake Meadows (subdivision)
- Deer Park
- Deer Park
- Deer Park, Township of
- Deerpath
- Deerpath Estates (subdivision)
- Deer Plain
- Deer Ridge
- Deer Run
- Deers
- Dees
- Degognia
- Degognia, Township of
- DeKalb
- DeKalb County
- DeKalb, Township of
- Delafield
- De Land
- Delavan
- Delavan, Township of
- Delbert Egan Housing Project
- Delhi
- Del Mar Woods
- DeLong
- Delrey
- Delta
- Delwood
- Dement, Township of
- Democrat Spring
- Denison, Township of
- Denmark
- Denmark (historical)
- Denning, Township of
- Dennison
- Denny
- Denny (historical)
- Denrock
- Denver
- Denver, Township of
- Depler Springs
- Depue
- Derby
- Derby
- Derinda, Township of
- Derry, Township of
- Deselm
- De Soto
- De Soto, Township of
- Des Plaines
- Detroit
- Detroit, Township of
- Devereux Heights
- Dewey
- De Witt
- De Witt County
- De Witt, Township of
- Dewmaine
- Dexter