Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Cereal | Populated Place | 219 | Livingston | 40 42 30 N | 088 21 04 W |
| Cereal School (historical) | School | 221 | Livingston | 40 43 05 N | 088 20 01 W |
| Ceres Cemetery | Cemetery | 174 | Greene | 39 30 27 N | 090 12 32 W |
| Ceres School (historical) | School | 179 | Greene | 39 30 20 N | 090 12 30 W |
| Cermak Baptist Church | Church | 182 | Cook | 41 51 08 N | 087 40 39 W |
| Cermak Church of God | Church | 183 | Cook | 41 51 48 N | 087 43 25 W |
| Cermak Park | Park | 183 | Cook | 41 49 06 N | 087 48 40 W |
| Cermak Plaza Shopping Center | Locale | 189 | Cook | 41 50 57 N | 087 48 05 W |
| Cerny Park | Park | 210 | DuPage | 41 48 40 N | 088 10 35 W |
| Cerran Park | Park | 191 | Cook | 41 52 18 N | 087 52 43 W |
| Cerri Memorial Park | Park | 201 | La Salle | 41 15 51 N | 089 07 18 W |
| Cerro Gordo | Populated Place | 226 | Piatt | 39 53 26 N | 088 43 41 W |
| Cerro Gordo Cemetery | Cemetery | 219 | Piatt | 39 53 49 N | 088 44 19 W |
| Cerro Gordo Elementary School | School | 226 | Piatt | 39 53 22 N | 088 43 46 W |
| Cerro Gordo High School | School | 222 | Piatt | 39 53 19 N | 088 43 35 W |
| Cerro Gordo Junior High School | School | 222 | Piatt | 39 53 17 N | 088 43 34 W |
| CGH Medical Center Heliport | Airport | 204 | Whiteside | 41 48 17 N | 089 41 50 W |
| Chaddock Boys School | School | 196 | Adams | 39 55 43 N | 091 22 28 W |
| Chadwick | Populated Place | 244 | Carroll | 42 00 48 N | 089 53 26 W |
| Chadwick Junior High School | School | 235 | Carroll | 42 00 36 N | 089 52 59 W |
| Chadwick Methodist Cemetery | Cemetery | 225 | Carroll | 42 00 35 N | 089 52 05 W |
| Chadwick School (historical) | School | 197 | Shelby | 39 34 10 N | 088 56 20 W |
| Chaffer School (historical) | School | 223 | Tazewell | 40 36 54 N | 089 20 48 W |
| Chain Lake | Lake | 132 | Mason | 40 08 31 N | 090 13 23 W |
| Chain Lake | Lake | 132 | Mason | 40 07 42 N | 090 19 07 W |
| Chain Lakes | Lake | 131 | Perry | 38 00 45 N | 089 25 06 W |
| Chain O'Lakes State Park | Park | 225 | Lake | 42 27 42 N | 088 09 53 W |
| Chain of Lakes | Reservoir | 228 | Knox | 40 59 19 N | 090 04 39 W |
| Chain of Rocks Bridge | Bridge | 121 | Madison | 38 45 37 N | 090 10 30 W |
| Chain of Rocks Canal | Canal | 121 | Madison | 38 45 56 N | 090 08 06 W |
| Chalfin Bridge | Populated Place | 122 | Monroe | 38 12 43 N | 090 16 07 W |
| Chalk Bluff | Cliff | 187 | Jackson | 37 40 48 N | 089 24 25 W |
| Chalkey School (historical) | School | 194 | McDonough | 40 17 32 N | 090 32 44 W |
| Challacombe | Populated Place | 164 | Macoupin | 39 13 06 N | 090 07 16 W |
| Challacombe Hall | Building | 189 | Macoupin | 39 17 17 N | 089 52 22 W |
| Challacombe Park | Park | 184 | Montgomery | 39 09 25 N | 089 29 20 W |
| Challand Junior High School | School | 209 | Whiteside | 41 48 10 N | 089 41 17 W |
| Challenger Park | Park | 241 | Cook | 42 02 08 N | 088 10 09 W |
| Chalman School (historical) | School | 233 | Knox | 41 04 14 N | 090 06 58 W |
| Chalmers School | School | 181 | Cook | 41 51 57 N | 087 41 43 W |
| Chamberlain Cemetery | Cemetery | 193 | Iroquois | 40 46 42 N | 087 44 23 W |
| Chamberlain Creek | Stream | | Lee | 41 53 17 N | 089 24 31 W |
| Chamberlain Hall | Building | 180 | Cook | 42 00 04 N | 087 39 28 W |
| Chamberlain School (historical) | School | 236 | Ogle | 42 01 21 N | 088 58 50 W |
| Chambers Cemetery | Cemetery | 201 | Coles | 39 29 45 N | 088 11 06 W |
| Chambers Grove Cemetery | Cemetery | 292 | Ogle | 42 05 23 N | 089 41 02 W |
| Chambers Grove School (historical) | School | 289 | Carroll | 42 05 21 N | 089 41 11 W |
| Chambers School (historical) | School | 223 | Carroll | 41 58 29 N | 089 50 41 W |
| Chambers School (historical) | School | 210 | Champaign | 39 57 09 N | 088 23 13 W |
| Chambersburg | Populated Place | 142 | Pike | 39 49 02 N | 090 39 26 W |
| Chamness (historical) | Populated Place | 138 | Williamson | 37 40 37 N | 088 59 19 W |
| Chamness Cemetery | Cemetery | 127 | Williamson | 37 41 58 N | 089 01 45 W |
| Chamnesstown School (historical) | School | 131 | Williamson | 37 43 11 N | 089 01 35 W |
| Champ Clark Bridge | Bridge | 137 | Pike | 39 27 24 N | 091 02 48 W |
| Champaign | Populated Place | 225 | Champaign | 40 06 59 N | 088 14 36 W |
| Champaign Airport (historical) | Airport | 232 | Champaign | 40 08 33 N | 088 16 33 W |
| Champaign City Hall | Building | 225 | Champaign | 40 06 59 N | 088 14 35 W |
| Champaign Country Club | Locale | 242 | Champaign | 40 06 13 N | 088 15 38 W |
| Champaign County | Civil | 222 | Champaign | 40 08 00 N | 088 12 00 W |
| Champaign County Conservation Area | Park | 202 | Champaign | 40 03 55 N | 087 59 11 W |
| Champaign County Courthouse | Building | 221 | Champaign | 40 06 43 N | 088 12 25 W |
| Champaign County Fairground | Locale | 217 | Champaign | 40 07 25 N | 088 12 45 W |
| Champaign County Home | Building | 223 | Champaign | 40 06 42 N | 088 11 10 W |
| Champaign Post Office | Post Office | 224 | Champaign | 40 07 17 N | 088 14 35 W |
| Champaign-Urbana Civic Center | Building | 218 | Champaign | 40 06 49 N | 088 12 23 W |
| Champion Hill School (historical) | School | 284 | Stephenson | 42 25 29 N | 089 36 50 W |
| Champion School (historical) | School | 216 | De Witt | 40 07 42 N | 088 42 24 W |
| Champion School (historical) | School | 198 | Livingston | 40 56 50 N | 088 38 37 W |
| Champion School (historical) | School | 188 | Livingston | 41 01 59 N | 088 45 25 W |
| Champion School (historical) | School | 183 | Shelby | 39 16 26 N | 088 53 53 W |
| Champion School (historical) | School | 201 | Shelby | 39 26 56 N | 088 58 36 W |
| Champion School (historical) | School | 195 | Shelby | 39 26 59 N | 088 51 53 W |
| Champion School (historical) | School | 196 | Whiteside | 41 39 31 N | 089 43 41 W |
| Champion School (historical) | School | 224 | Winnebago | 42 25 28 N | 089 12 14 W |
| Champion-Drawyer Cemetery | Cemetery | 223 | Stark | 41 08 53 N | 089 41 44 W |
| Champlain Building | Building | 183 | Cook | 41 52 51 N | 087 37 32 W |
| Champlin | Populated Place | 203 | Livingston | 40 46 59 N | 088 32 45 W |
| Chana | Populated Place | 238 | Ogle | 41 58 50 N | 089 13 11 W |
| Chana Post Office | Post Office | 238 | Ogle | 41 58 47 N | 089 13 18 W |
| Chana United Methodist Church | Church | 237 | Ogle | 41 58 38 N | 089 13 18 W |
| Chance School (historical) | School | 165 | Marion | 38 45 01 N | 089 00 54 W |
| Chandler Cemetery | Cemetery | 210 | Macon | 40 03 02 N | 088 45 49 W |
| Chandler Park | Park | 184 | Cook | 42 03 46 N | 087 41 10 W |
| Chandler Park | Park | 215 | McDonough | 40 27 37 N | 090 40 16 W |
| Chandler Pond | Lake | 212 | Pike | 39 31 43 N | 090 37 40 W |
| Chandler School (historical) | School | 218 | Henderson | 40 40 53 N | 090 58 54 W |
| Chandler School (historical) | School | 238 | McLean | 40 32 48 N | 088 51 53 W |
| Chandler School (historical) | School | 134 | Wayne | 38 19 56 N | 088 11 27 W |
| Chandlerville | Populated Place | 141 | Cass | 40 02 53 N | 090 09 18 W |
| Chandlerville Baptist Church | Church | 141 | Cass | 40 03 01 N | 090 08 49 W |
| Chandlerville City Cemetery | Cemetery | 167 | Cass | 40 02 36 N | 090 08 53 W |
| Chandlerville Junior High School | School | 152 | Cass | 40 02 51 N | 090 08 56 W |
| Chandlerville School (historical) | School | 188 | Fayette | 39 10 23 N | 089 04 47 W |
| Chaney Cemetery | Cemetery | 156 | Mason | 40 13 46 N | 089 57 32 W |
| Chaney Cemetery | Cemetery | 235 | Ogle | 42 03 09 N | 089 09 47 W |
| Chaney Creek | Stream | | Hancock | 40 24 27 N | 091 21 08 W |
| Chaney School | School | 195 | Will | 41 33 26 N | 088 05 34 W |
| Chaney Union School (historical) | School | 154 | Mason | 40 14 19 N | 089 57 40 W |
| Channahon | Populated Place | 161 | Will | 41 25 46 N | 088 13 43 W |
| Channahon Junior High School | School | 162 | Will | 41 26 37 N | 088 14 04 W |
| Channahon Middle School | School | 161 | Will | 41 25 46 N | 088 13 38 W |
| Channahon Parkway State Park | Park | 159 | Will | 41 25 27 N | 088 13 39 W |
| Channahon Post Office | Post Office | 161 | Will | 41 26 00 N | 088 13 22 W |
| Channahon Village Hall | Building | 165 | Will | 41 26 47 N | 088 12 19 W |
| Channel Lake | Lake | 223 | Lake | 42 29 02 N | 088 08 21 W |
| Channel Lake | Populated Place | 227 | Lake | 42 28 43 N | 088 08 15 W |
| Channel Lake School (historical) | School | 227 | Lake | 42 28 33 N | 088 08 58 W |
| Channing Memorial Elementary School | School | 234 | Kane | 42 02 09 N | 088 16 23 W |
| Channing Park | Park | 238 | Kane | 42 02 06 N | 088 16 18 W |
| Chanute Air Force Base (historical) | Military (Historical) | 224 | Champaign | 40 17 40 N | 088 08 35 W |