| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Daggett (historical) | city | Illinois | United States | 42.03 | -89.97 | 830 | |
| Dahinda | city | Illinois | United States | 40.92 | -90.11 | 830 | |
| Dahlgren | city | Illinois | United States | 38.20 | -88.68 | 830 | |
| Dailey | city | Illinois | United States | 40.24 | -87.95 | 830 | |
| Dakota | city | Illinois | United States | 42.39 | -89.53 | 938 | |
| Dale | city | Illinois | United States | 38.00 | -88.49 | 390 | |
| Dallas City | city | Illinois | United States | 40.64 | -91.17 | 830 | |
| Dalton City | city | Illinois | United States | 39.71 | -88.80 | 830 | |
| Dalzell | city | Illinois | United States | 41.36 | -89.18 | 830 | |
| Damascus | city | Illinois | United States | 42.37 | -89.71 | 830 | |
| Damiansville | city | Illinois | United States | 38.51 | -89.62 | 830 | |
| Damon | city | Illinois | United States | 40.08 | -90.83 | 830 | |
| Dana | city | Illinois | United States | 40.96 | -88.95 | 830 | |
| Dana Court Subdivision | city | Illinois | United States | 42.14 | -87.88 | 830 | |
| Danforth | city | Illinois | United States | 40.82 | -87.98 | 830 | |
| Danley | city | Illinois | United States | 38.10 | -90.12 | 387 | |
| Danvers | city | Illinois | United States | 40.53 | -89.18 | 830 | |
| Danville | city | Illinois | United States | 40.12 | -87.63 | 830 | |
| Danway | city | Illinois | United States | 41.43 | -88.69 | 830 | |
| Dareville | city | Illinois | United States | 38.20 | -88.98 | 830 | |
| Darien | city | Illinois | United States | 41.75 | -87.97 | 830 | |
| Darien | city | Illinois | United States | 41.75 | -88.00 | 830 | |
| Darmstadt | city | Illinois | United States | 38.32 | -89.73 | 830 | |
| Darmstadt (historical) | city | Illinois | United States | 38.46 | -90.15 | 830 | |
| Darrow | city | Illinois | United States | 40.72 | -87.60 | 830 | |
| Darwin | city | Illinois | United States | 39.28 | -87.61 | 830 | |
| Dauphin Park | city | Illinois | United States | 41.73 | -87.61 | 830 | |
| Davis | city | Illinois | United States | 42.42 | -89.41 | 931 | |
| Davis (historical) | city | Illinois | United States | 39.68 | -90.22 | 830 | |
| Davis Junction | city | Illinois | United States | 42.10 | -89.09 | 830 | |
| Dawleys | city | Illinois | United States | 37.21 | -89.30 | 341 | |
| Dawn Wood | city | Illinois | United States | 41.63 | -87.95 | 830 | |
| Dawson | city | Illinois | United States | 39.85 | -89.46 | 830 | |
| Daysville | city | Illinois | United States | 41.98 | -89.32 | 830 | |
| Dayton | city | Illinois | United States | 41.49 | -90.32 | 830 | |
| Dayton | city | Illinois | United States | 41.38 | -88.79 | 830 | |
| De Land | city | Illinois | United States | 40.12 | -88.65 | 830 | |
| De Soto | city | Illinois | United States | 37.82 | -89.23 | 396 | |
| De Witt | city | Illinois | United States | 40.18 | -88.79 | 830 | |
| DeKalb | city | Illinois | United States | 41.93 | -88.75 | 859 | |
| DeLong | city | Illinois | United States | 40.82 | -90.30 | 830 | |
| Dean-Horsch Subdivision | city | Illinois | United States | 42.13 | -87.81 | 830 | |
| Dearborn Homes | city | Illinois | United States | 41.84 | -87.63 | 830 | |
| Deboer Woods | city | Illinois | United States | 41.59 | -87.92 | 830 | |
| Decatur | city | Illinois | United States | 39.84 | -88.95 | 830 | |
| Decorra | city | Illinois | United States | 40.73 | -90.97 | 830 | |
| Deer Chase | city | Illinois | United States | 42.16 | -88.10 | 892 | |
| Deer Creek | city | Illinois | United States | 40.63 | -89.33 | 830 | |
| Deer Grove | city | Illinois | United States | 41.61 | -89.69 | 830 | |
| Deer Lake | city | Illinois | United States | 42.15 | -88.10 | 859 | |
| Deer Lake Meadows | city | Illinois | United States | 42.17 | -88.10 | 849 | |
| Deer Park | city | Illinois | United States | 42.16 | -88.08 | 830 | |
| Deer Park | city | Illinois | United States | 41.30 | -89.04 | 830 | |
| Deer Plain | city | Illinois | United States | 38.93 | -90.53 | 830 | |
| Deer Ridge | city | Illinois | United States | 37.58 | -88.94 | 830 | |
| Deer Run | city | Illinois | United States | 41.95 | -88.39 | 830 | |
| Deer Run | city | Illinois | United States | 41.61 | -88.03 | 830 | |
| Deer Run Estates | city | Illinois | United States | 41.53 | -88.18 | 830 | |
| Deercrest Estates | city | Illinois | United States | 42.12 | -87.87 | 830 | |
| Deerfield | city | Illinois | United States | 42.17 | -87.84 | 830 | |
| Deering City | city | Illinois | United States | 37.92 | -88.89 | 390 | |
| Deerpath | city | Illinois | United States | 42.25 | -87.86 | 830 | |
| Deerpath Creek | city | Illinois | United States | 41.66 | -88.35 | 830 | |
| Deerpath Estates | city | Illinois | United States | 42.17 | -88.09 | 849 | |
| Deerpath Trails | city | Illinois | United States | 41.66 | -88.34 | 830 | |
| Deers | city | Illinois | United States | 40.06 | -88.12 | 830 | |
| Dees | city | Illinois | United States | 39.22 | -88.16 | 830 | |
| Degognia | city | Illinois | United States | 37.86 | -89.63 | 830 | |
| Dehne's Subdivision | city | Illinois | United States | 42.12 | -87.83 | 830 | |
| Dekaturo | city | Illinois | United States | 39.84 | -88.95 | 830 | |
| Del Mar Woods | city | Illinois | United States | 42.20 | -87.86 | 830 | |
| Delafield | city | Illinois | United States | 38.15 | -88.60 | 416 | |
| Delavan | city | Illinois | United States | 40.37 | -89.55 | 830 | |
| Delbert Egan Housing Project | city | Illinois | United States | 41.14 | -88.84 | 830 | |
| Delhi | city | Illinois | United States | 39.05 | -90.26 | 830 | |
| Delrey | city | Illinois | United States | 40.67 | -88.02 | 830 | |
| Delta | city | Illinois | United States | 37.68 | -88.70 | 400 | |
| Delwood | city | Illinois | United States | 37.58 | -88.57 | 830 | |
| Democrat Spring | city | Illinois | United States | 39.08 | -90.48 | 830 | |
| Denmark | city | Illinois | United States | 38.00 | -89.50 | 830 | |
| Denmark (historical) | city | Illinois | United States | 40.16 | -87.64 | 830 | |
| Dennison | city | Illinois | United States | 39.46 | -87.60 | 830 | |
| Denny | city | Illinois | United States | 38.05 | -89.33 | 403 | |
| Denny (historical) | city | Illinois | United States | 40.99 | -90.70 | 830 | |
| Denrock | city | Illinois | United States | 41.70 | -89.98 | 830 | |
| Denver | city | Illinois | United States | 40.29 | -91.11 | 830 | |
| Depler Springs | city | Illinois | United States | 40.43 | -90.18 | 830 | |
| Depue | city | Illinois | United States | 41.32 | -89.31 | 830 | |
| Derby | city | Illinois | United States | 40.44 | -88.44 | 830 | |
| Derby | city | Illinois | United States | 37.63 | -88.39 | 830 | |
| Derby Hills | city | Illinois | United States | 41.63 | -87.93 | 830 | |
| Derby Meadows | city | Illinois | United States | 41.63 | -87.92 | 830 | |
| Des Plaines | city | Illinois | United States | 42.03 | -87.88 | 830 | |
| Des Pleinsas | city | Illinois | United States | 42.03 | -87.88 | 830 | |
| Deselm | city | Illinois | United States | 41.25 | -87.97 | 830 | |
| Detroit | city | Illinois | United States | 39.62 | -90.68 | 830 | |
| Devereux Heights | city | Illinois | United States | 39.85 | -89.61 | 830 | |
| Dewey | city | Illinois | United States | 40.32 | -88.28 | 830 | |
| Dewmaine | city | Illinois | United States | 37.78 | -89.08 | 403 | |
| Dexter | city | Illinois | United States | 39.08 | -88.68 | 830 | |
| Diamond | city | Illinois | United States | 41.29 | -88.25 | 830 | |
| Diamond City | city | Illinois | United States | 38.09 | -88.55 | 830 | |
| Diamond Cross | city | Illinois | United States | 37.98 | -89.84 | 830 | |
| Diamond Lake | city | Illinois | United States | 42.24 | -88.01 | 830 | |
| Diana | city | Illinois | United States | 38.10 | -88.75 | 830 | |
| Dickerson | city | Illinois | United States | 40.32 | -88.42 | 830 | |
| Dickeys | city | Illinois | United States | 41.05 | -88.04 | 830 | |
| Dieterich | city | Illinois | United States | 39.06 | -88.38 | 830 | |
| Dillon | city | Illinois | United States | 40.48 | -89.54 | 830 | |
| Dillonfield | city | Illinois | United States | 41.90 | -88.41 | 830 | |
| Dillsburg | city | Illinois | United States | 40.32 | -88.08 | 830 | |
| Dimmick | city | Illinois | United States | 41.44 | -89.12 | 830 | |
| Diona | city | Illinois | United States | 39.38 | -88.14 | 830 | |
| Disco | city | Illinois | United States | 40.62 | -91.02 | 830 | |
| Diswood | city | Illinois | United States | 37.23 | -89.32 | 357 | |
| Divernon | city | Illinois | United States | 39.57 | -89.66 | 830 | |
| Divide | city | Illinois | United States | 38.45 | -88.83 | 830 | |
| Divine | city | Illinois | United States | 41.39 | -88.30 | 830 | |
| Dix | city | Illinois | United States | 38.44 | -88.94 | 830 | |
| Dixmoor | city | Illinois | United States | 41.63 | -87.66 | 830 | |
| Dixon | city | Illinois | United States | 41.84 | -89.48 | 830 | |
| Dixon Springs | city | Illinois | United States | 37.38 | -88.67 | 830 | |
| Doctor Parker Place | city | Illinois | United States | 41.60 | -87.95 | 830 | |
| Doddsville | city | Illinois | United States | 40.28 | -90.65 | 830 | |
| Dog Walk | city | Illinois | United States | 37.76 | -88.93 | 830 | |
| Dogwood | city | Illinois | United States | 39.06 | -87.89 | 830 | |
| Dolands Addition | city | Illinois | United States | 42.02 | -87.67 | 830 | |
| Dollville | city | Illinois | United States | 39.44 | -88.99 | 830 | |
| Dolton | city | Illinois | United States | 41.64 | -87.61 | 830 | |
| Doney | city | Illinois | United States | 41.07 | -87.63 | 830 | |
| Dongola | city | Illinois | United States | 37.36 | -89.17 | 416 | |
| Donkville | city | Illinois | United States | 38.70 | -89.98 | 830 | |
| Donnellson | city | Illinois | United States | 39.03 | -89.47 | 830 | |
| Donny Hill Meadows | city | Illinois | United States | 41.85 | -88.46 | 830 | |
| Donovan | city | Illinois | United States | 40.88 | -87.62 | 830 | |
| Donovan Glen Subdivision | city | Illinois | United States | 42.11 | -87.86 | 830 | |
| Dorans | city | Illinois | United States | 39.55 | -88.34 | 830 | |
| Dorchester | city | Illinois | United States | 39.09 | -89.89 | 830 | |
| Dorothy Stirling Subdivision | city | Illinois | United States | 42.12 | -87.80 | 830 | |
| DorothyStirling Estates | city | Illinois | United States | 42.12 | -87.79 | 830 | |
| Dorris Heights | city | Illinois | United States | 37.75 | -88.55 | 374 | |
| Dorrisville | city | Illinois | United States | 37.72 | -88.54 | 383 | |
| Dorsey | city | Illinois | United States | 38.97 | -90.00 | 830 | |
| Douglas | city | Illinois | United States | 38.42 | -89.98 | 830 | |
| Douglas | city | Illinois | United States | 41.83 | -87.62 | 830 | |
| Douglas | city | Illinois | United States | 40.79 | -90.08 | 830 | |
| Douglas Park | city | Illinois | United States | 41.79 | -89.73 | 830 | |
| Dover | city | Illinois | United States | 41.44 | -89.39 | 830 | |
| Dover Pond | city | Illinois | United States | 42.16 | -88.07 | 830 | |
| Dow | city | Illinois | United States | 39.01 | -90.34 | 830 | |
| Dowell | city | Illinois | United States | 37.94 | -89.24 | 400 | |
| Downers Grove | city | Illinois | United States | 41.81 | -88.01 | 830 | |
| Downing Street Subdivision | city | Illinois | United States | 42.14 | -87.88 | 830 | |
| Downs | city | Illinois | United States | 40.40 | -88.87 | 830 | |
| Doyles | city | Illinois | United States | 39.48 | -87.87 | 830 | |
| Dozaville | city | Illinois | United States | 37.91 | -89.96 | 370 | |
| Drafke | city | Illinois | United States | 41.69 | -88.12 | 830 | |
| Dressor | city | Illinois | United States | 39.17 | -89.05 | 830 | |
| Drexel Estate | city | Illinois | United States | 41.78 | -87.67 | 830 | |
| Driftwood | city | Illinois | United States | 42.12 | -87.80 | 830 | |
| Drivers | city | Illinois | United States | 38.33 | -88.99 | 830 | |
| Druce Lake | city | Illinois | United States | 42.37 | -88.00 | 830 | |
| Drummond | city | Illinois | United States | 41.41 | -88.18 | 830 | |
| Dry Hill | city | Illinois | United States | 37.82 | -89.55 | 830 | |
| Du Bois | city | Illinois | United States | 38.22 | -89.21 | 830 | |
| Du Quoin | city | Illinois | United States | 38.01 | -89.24 | 830 | |
| DuBois Center | city | Illinois | United States | 38.25 | -89.21 | 830 | |
| Ducktown | city | Illinois | United States | 41.83 | -87.68 | 830 | |
| Dudley | city | Illinois | United States | 39.58 | -87.85 | 830 | |
| Dudleyville | city | Illinois | United States | 38.82 | -89.42 | 830 | |
| Duncan | city | Illinois | United States | 40.98 | -89.79 | 830 | |
| Duncan Mills | city | Illinois | United States | 40.34 | -90.19 | 830 | |
| Duncans Addition | city | Illinois | United States | 41.88 | -87.65 | 830 | |
| Duncanville | city | Illinois | United States | 38.95 | -87.70 | 830 | |
| Dundas | city | Illinois | United States | 38.84 | -88.09 | 830 | |
| Dundee Road Acres | city | Illinois | United States | 42.14 | -87.84 | 830 | |
| Dunes Park | city | Illinois | United States | 42.42 | -87.83 | 830 | |
| Dunfermline | city | Illinois | United States | 40.49 | -90.03 | 830 | |
| Dunham Castle | city | Illinois | United States | 41.95 | -88.27 | 830 | |
| Dunkel | city | Illinois | United States | 39.47 | -89.06 | 830 | |
| Dunlap | city | Illinois | United States | 40.86 | -89.68 | 830 | |
| Dunn | city | Illinois | United States | 39.63 | -88.69 | 830 | |
| Dunn Corners | city | Illinois | United States | 42.48 | -87.99 | 830 | |
| Dunning | city | Illinois | United States | 41.95 | -87.80 | 830 | |
| Dunsten Green | city | Illinois | United States | 42.14 | -87.85 | 830 | |
| Dupo | city | Illinois | United States | 38.52 | -90.21 | 400 | |
| Durand | city | Illinois | United States | 42.44 | -89.33 | 830 | |
| Durham | city | Illinois | United States | 40.60 | -91.09 | 830 | |
| Durley | city | Illinois | United States | 38.93 | -89.37 | 830 | |
| Dutch Hollow | city | Illinois | United States | 38.57 | -90.03 | 830 | |
| Dutch Mills | city | Illinois | United States | 37.42 | -89.27 | 830 | |
| Dutton (historical) | city | Illinois | United States | 39.67 | -90.80 | 830 | |
| Duvall | city | Illinois | United States | 39.48 | -88.79 | 830 | |
| Dwight | city | Illinois | United States | 41.09 | -88.43 | 830 | |
| Dykersburg | city | Illinois | United States | 37.69 | -88.74 | 830 |