Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Crider Island | Island | 137 | Pike | 39 25 38 N | 090 59 40 W |
| Crileys Branch | Stream | | Clinton | 38 33 08 N | 089 10 04 W |
| Crill School (historical) | School | 258 | Ogle | 42 07 00 N | 088 58 57 W |
| Cripps Bend | Bend | 105 | Jackson | 37 38 16 N | 089 25 54 W |
| Crisel Cemetery | Cemetery | 140 | Hamilton | 38 06 56 N | 088 32 30 W |
| Crisel Cemetery | Cemetery | 168 | Hamilton | 38 11 29 N | 088 38 38 W |
| Crisenberry Dam | Dam | 126 | Jackson | 37 46 40 N | 089 27 14 W |
| Crisp | Populated Place | 138 | Wayne | 38 26 22 N | 088 35 44 W |
| Crisp Cemetery | Cemetery | 167 | Scott | 39 41 16 N | 090 32 00 W |
| Crispin Hall | Building | 203 | Morgan | 39 43 56 N | 090 14 53 W |
| Crisson School (historical) | School | 180 | Fayette | 39 04 06 N | 089 11 35 W |
| Criswell George Cemetery | Cemetery | 201 | Morgan | 39 35 15 N | 090 05 02 W |
| Criswell School (historical) | School | 201 | Morgan | 39 35 08 N | 090 04 56 W |
| Critchlow Cemetery | Cemetery | 131 | Hardin | 37 25 38 N | 088 21 52 W |
| Crites Cemetery | Cemetery | 177 | Mason | 40 11 02 N | 089 45 15 W |
| Crittenden Townhall | Building | 201 | Champaign | 39 55 25 N | 088 10 49 W |
| Crocker School (historical) | School | 142 | Clinton | 38 37 01 N | 089 24 34 W |
| Croft | Populated Place | 184 | Menard | 40 02 53 N | 089 35 18 W |
| Cromeenes Hollow | Valley | | Pope | 37 18 21 N | 088 36 37 W |
| Cromien School (historical) | School | 253 | Henry | 41 11 37 N | 090 00 14 W |
| Cronan School (historical) | School | 188 | Will | 41 32 11 N | 088 12 33 W |
| Cronin Hollow | Valley | | Brown | 39 53 06 N | 090 52 13 W |
| Cronin Park | Park | 209 | Cook | 42 04 40 N | 087 59 05 W |
| Cronktown School (historical) | School | 242 | DeKalb | 42 05 13 N | 088 54 01 W |
| Cronninger Cemetery | Cemetery | 199 | Piatt | 39 58 24 N | 088 43 35 W |
| Crook RLA Airport | Airport | 174 | Monroe | 38 23 13 N | 090 11 30 W |
| Crooked Creek | Stream | | Bureau | 41 31 39 N | 089 40 15 W |
| Crooked Creek | Stream | | Calhoun | 39 17 41 N | 090 45 12 W |
| Crooked Creek | Stream | | Clark | 39 22 34 N | 087 31 49 W |
| Crooked Creek | Stream | | Clay | 38 47 31 N | 088 31 39 W |
| Crooked Creek | Stream | | Cook | 41 41 30 N | 087 52 35 W |
| Crooked Creek | Stream | | Cumberland | 39 12 15 N | 088 16 50 W |
| Crooked Creek | Stream | | Edwards | 38 30 33 N | 087 57 08 W |
| Crooked Creek | Stream | | Greene | 39 22 11 N | 090 31 15 W |
| Crooked Creek | Stream | | Jasper | 38 58 55 N | 088 04 02 W |
| Crooked Creek | Stream | | Marion | 38 30 51 N | 088 45 25 W |
| Crooked Creek | Stream | | McLean | 40 34 50 N | 088 47 51 W |
| Crooked Creek | Stream | | McLean | 40 35 45 N | 088 45 57 W |
| Crooked Creek | Stream | | Randolph | 38 03 22 N | 089 58 28 W |
| Crooked Creek | Stream | | Union | 37 20 29 N | 089 10 46 W |
| Crooked Creek | Stream | | Washington | 38 29 40 N | 089 25 05 W |
| Crooked Creek | Stream | | Wayne | 38 24 14 N | 088 36 38 W |
| Crooked Creek | Stream | | White | 38 10 13 N | 088 06 34 W |
| Crooked Creek Church | Church | 159 | Clay | 38 49 27 N | 088 37 58 W |
| Crooked Creek Woods | Woods | 196 | Cook | 41 42 09 N | 087 50 59 W |
| Crooked Lake | Lake | 232 | Lake | 42 25 25 N | 088 03 06 W |
| Crooked Lake | Lake | 128 | St. Clair | 38 37 34 N | 090 02 58 W |
| Crooked Run | Stream | | Greene | 39 23 27 N | 090 22 26 W |
| Crooked Slough | Gut | 137 | Pike | 39 25 34 N | 090 52 21 W |
| Crooked Slough | Gut | 137 | Pike | 39 33 07 N | 091 05 41 W |
| Crooked Slough | Stream | | Jo Daviess | 42 27 26 N | 090 36 13 W |
| Crooked Slough | Stream | | Jo Daviess | 42 12 17 N | 090 19 45 W |
| Crookedleg Creek | Stream | | La Salle | 41 26 50 N | 088 46 54 W |
| Cropper School (historical) | School | 204 | Moultrie | 39 35 44 N | 088 47 32 W |
| Croppie Lake | Lake | 142 | Adams | 39 50 15 N | 091 23 56 W |
| Cropsey | Populated Place | 243 | McLean | 40 36 33 N | 088 28 43 W |
| Cropsey Cemetery | Cemetery | 244 | McLean | 40 36 31 N | 088 28 09 W |
| Cropsey Post Office | Post Office | 245 | McLean | 40 36 30 N | 088 28 49 W |
| Crosier School (historical) | School | 214 | DuPage | 41 46 54 N | 088 12 21 W |
| Cross Cemetery | Cemetery | 201 | Macon | 39 54 02 N | 088 49 37 W |
| Cross Church | Church | 132 | Perry | 38 08 32 N | 089 20 52 W |
| Cross Country Mall Shopping Center | Locale | 218 | Coles | 39 29 07 N | 088 20 35 W |
| Cross Creek Commons Shopping Center | Locale | 222 | Cook | 41 59 52 N | 088 03 34 W |
| Cross Diversion Ditch | Canal | 118 | Wayne | 38 30 39 N | 088 09 34 W |
| Cross Lake | Lake | 247 | Lake | 42 29 50 N | 088 05 12 W |
| Cross Lake | Reservoir | 221 | McLean | 40 34 12 N | 089 14 48 W |
| Cross Lake Dam | Dam | 221 | McLean | 40 34 12 N | 089 14 48 W |
| Cross Lane School (historical) | School | 219 | Knox | 40 48 09 N | 090 26 02 W |
| Cross Lutheran Cemetery | Cemetery | 216 | Kendall | 41 35 44 N | 088 26 13 W |
| Cross Lutheran Church | Church | 215 | Kendall | 41 35 43 N | 088 26 11 W |
| Cross of Christ Lutheran Church | Church | 233 | DuPage | 41 43 44 N | 088 01 06 W |
| Cross of Glory Lutheran Church | Church | 231 | Will | 41 36 17 N | 087 55 46 W |
| Cross Plains Post Office (historical) | Post Office | 162 | Sangamon | 39 51 31 N | 089 46 16 W |
| Cross Pointe Church | Church | 253 | McLean | 40 31 05 N | 088 55 24 W |
| Cross Road Cemetery | Cemetery | 132 | Williamson | 37 45 00 N | 088 52 30 W |
| Cross Roads (historical) | Populated Place | 131 | Johnson | 37 28 02 N | 088 46 37 W |
| Cross Roads Cemetery | Cemetery | 198 | Brown | 39 55 50 N | 090 39 16 W |
| Cross Roads Church | Church | 147 | Hamilton | 37 56 11 N | 088 30 14 W |
| Cross Roads School (historical) | School | 213 | Edgar | 39 36 00 N | 087 48 50 W |
| Cross School | School | 215 | Kendall | 41 35 47 N | 088 26 11 W |
| Cross School (historical) | School | 137 | Perry | 38 09 23 N | 089 20 32 W |
| Cross Slough | Gut | 132 | Mason | 40 07 45 N | 090 17 26 W |
| Cross Temple Church of God in Christ | Church | 186 | Cook | 41 43 41 N | 087 39 34 W |
| Crosses Corner Access Area | Locale | 165 | Mercer | 41 18 11 N | 091 04 13 W |
| Crossing Pond Park | Park | 217 | Lake | 42 10 13 N | 087 59 38 W |
| Crossing School (historical) | School | 200 | Cumberland | 39 20 43 N | 088 26 36 W |
| Crosskey Lake (historical) | Lake | 135 | Clinton | 38 41 49 N | 089 16 16 W |
| Crossland Cemetery | Cemetery | 167 | Macoupin | 39 18 07 N | 090 06 34 W |
| Crossland Landing Strip | Airport | 206 | Hancock | 40 15 01 N | 091 04 24 W |
| Crossno School (historical) | School | 150 | Bond | 38 49 20 N | 089 17 00 W |
| Crossover School | School | 217 | Tazewell | 40 38 19 N | 089 30 30 W |
| Crossroad Commons Plaza Shopping Center | Locale | 251 | Cook | 42 02 53 N | 088 05 48 W |
| Crossroads | Populated Place | 135 | Johnson | 37 20 56 N | 088 49 03 W |
| Crossroads (subdivision) | Populated Place | 173 | St. Clair | 38 35 33 N | 089 57 59 W |
| Crossroads Assembly of God Church | Church | 196 | Peoria | 40 46 55 N | 089 57 19 W |
| Crossroads Cemetery | Cemetery | 202 | McDonough | 40 17 55 N | 090 35 32 W |
| Crossroads Cemetery | Cemetery | 301 | Stephenson | 42 26 40 N | 089 52 01 W |
| Crossroads Center Mall | Locale | 178 | St. Clair | 38 35 25 N | 089 59 26 W |
| Crossroads Church | Church | 179 | Rock Island | 41 30 48 N | 090 27 33 W |
| Crossroads Community Hospital | Hospital | 166 | Jefferson | 38 18 42 N | 088 56 12 W |
| Crossroads International Student Center | Building | 180 | Cook | 41 47 34 N | 087 35 24 W |
| Crossroads School | School | 148 | Pope | 37 34 26 N | 088 24 48 W |
| Crossroads School (historical) | School | 201 | Brown | 39 55 38 N | 090 39 13 W |
| Crossroads School (historical) | School | 131 | Jefferson | 38 11 54 N | 088 56 55 W |
| Crossroads School (historical) | School | 138 | Johnson | 37 28 01 N | 088 46 59 W |
| Crossroads School (historical) | School | 136 | Lawrence | 38 43 23 N | 087 43 17 W |
| Crossroads School (historical) | School | 201 | Morgan | 39 39 11 N | 090 11 12 W |
| Crossroads School (historical) | School | 198 | Pike | 39 32 46 N | 090 38 50 W |
| Crossroads School (historical) | School | 100 | Pulaski | 37 10 23 N | 089 07 18 W |
| Crossroads School (historical) | School | 189 | Schuyler | 40 10 22 N | 090 21 09 W |