Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Standard City Lake Dam | Dam | 190 | Macoupin | 39 20 18 N | 089 47 06 W |
| Standard Club | Building | 182 | Cook | 41 52 39 N | 087 37 44 W |
| Standard School | School | 202 | Cook | 41 33 36 N | 087 39 57 W |
| Standard School (historical) | School | 206 | Adams | 40 00 49 N | 091 20 39 W |
| Standard School (historical) | School | 213 | Champaign | 40 04 11 N | 088 19 56 W |
| Standard School (historical) | School | 189 | Shelby | 39 21 38 N | 088 56 13 W |
| Stanfield Cemetery | Cemetery | 172 | Crawford | 39 10 09 N | 087 46 40 W |
| Stanford | Populated Place | 207 | McLean | 40 26 05 N | 089 13 04 W |
| Stanford Grade School | School | 207 | McLean | 40 25 57 N | 089 13 14 W |
| Stanford Townhall | Building | 137 | Clay | 38 40 27 N | 088 25 45 W |
| Stanger Hall | Building | 211 | DuPage | 41 53 44 N | 087 56 56 W |
| Stanley Cemetery | Cemetery | 110 | Gallatin | 37 37 16 N | 088 11 11 W |
| Stanley Field Junior High School | School | 207 | Cook | 42 06 57 N | 087 51 27 W |
| Stanley Hall School | School | 218 | DuPage | 41 54 45 N | 088 03 16 W |
| Stanley R Pierce Hall | Building | 180 | Cook | 41 47 40 N | 087 35 55 W |
| Stanley School (historical) | School | 224 | Henderson | 40 43 06 N | 090 51 53 W |
| Stanton Airport | Airport | 176 | Sangamon | 39 49 25 N | 089 30 14 W |
| Stanton Bay | Bay | 223 | Lake | 42 24 07 N | 088 08 15 W |
| Stanton Cemetery | Cemetery | 141 | Johnson | 37 22 41 N | 088 55 11 W |
| Stanton Center School | School | 204 | Champaign | 40 11 12 N | 088 03 59 W |
| Stanton Creek | Stream | | Grundy | 41 20 47 N | 088 34 20 W |
| Stanton Park | Park | 180 | Cook | 41 54 22 N | 087 38 42 W |
| Stanton Point | Cape | 223 | Lake | 42 24 24 N | 088 08 34 W |
| Stanton School | School | 236 | Lake | 42 23 23 N | 088 09 44 W |
| Stanton Special Drainage Ditch | Canal | 203 | Champaign | 40 09 15 N | 088 04 27 W |
| Staples Corner | Populated Place | 223 | Cook | 42 08 21 N | 088 01 18 W |
| Star Bridge | Bridge | 134 | Schuyler | 39 58 48 N | 090 34 58 W |
| Star Church | Church | 113 | Saline | 37 52 26 N | 088 27 10 W |
| Star City | Populated Place | 138 | Calhoun | 39 08 03 N | 090 40 25 W |
| Star Grove Cemetery | Cemetery | 194 | Will | 41 21 37 N | 088 06 00 W |
| Star Mine Number 1 | Mine | 192 | Fulton | 40 30 22 N | 090 11 44 W |
| Star Mine Number 2 | Mine | 177 | Fulton | 40 30 47 N | 090 11 45 W |
| Star Point School (historical) | School | 203 | Montgomery | 39 17 27 N | 089 09 12 W |
| Star School (historical) | School | 210 | Adams | 40 05 17 N | 091 19 19 W |
| Star School (historical) | School | 233 | Carroll | 42 00 33 N | 089 50 24 W |
| Star School (historical) | School | 137 | Cass | 40 00 45 N | 090 22 24 W |
| Star School (historical) | School | 182 | Christian | 39 39 18 N | 089 25 28 W |
| Star School (historical) | School | 149 | Crawford | 38 56 06 N | 087 50 16 W |
| Star School (historical) | School | 184 | Fayette | 39 04 19 N | 088 51 25 W |
| Star School (historical) | School | 196 | Hancock | 40 12 51 N | 091 23 47 W |
| Star School (historical) | School | 203 | Macoupin | 39 29 37 N | 089 43 27 W |
| Star School (historical) | School | 159 | Tazewell | 40 27 52 N | 089 50 16 W |
| Star School (historical) | School | 208 | Warren | 40 40 23 N | 090 31 54 W |
| Star Union School (historical) | School | 193 | Montgomery | 39 28 48 N | 089 33 38 W |
| Stark | Populated Place | 201 | Stark | 40 59 44 N | 089 44 38 W |
| Stark County | Civil | 222 | Stark | 41 06 00 N | 089 48 00 W |
| Stark County Courthouse | Building | 225 | Stark | 41 05 37 N | 089 51 57 W |
| Stark County High School | School | 222 | Stark | 41 05 21 N | 089 51 49 W |
| Stark County Junior High School | School | 215 | Stark | 41 03 56 N | 089 46 14 W |
| Stark Pond | Reservoir | 200 | Woodford | 40 39 54 N | 089 04 18 W |
| Stark Pond Dam | Dam | 200 | Woodford | 40 39 54 N | 089 04 18 W |
| Stark School (historical) | School | 185 | Shelby | 39 16 31 N | 088 56 07 W |
| Stark School (historical) | School | 202 | Stark | 40 59 19 N | 089 44 04 W |
| Starkey Cemetery | Cemetery | 242 | Pike | 39 43 59 N | 090 52 33 W |
| Starkey Cemetery | Cemetery | 254 | Winnebago | 42 14 15 N | 089 01 41 W |
| Starkey School (historical) | School | 240 | Pike | 39 44 14 N | 090 51 46 W |
| Starkey School (historical) | School | 256 | Winnebago | 42 14 17 N | 089 01 45 W |
| Starks | Populated Place | 279 | Kane | 42 05 18 N | 088 27 24 W |
| Starlight Missionary Baptist Church | Church | 181 | Cook | 41 52 17 N | 087 41 46 W |
| Starlight Saint James Missionary Baptist Church | Church | 185 | Cook | 41 41 19 N | 087 37 24 W |
| Starne | Populated Place | 184 | Sangamon | 39 49 27 N | 089 36 18 W |
| Starr Field | Airport | 187 | Whiteside | 41 40 13 N | 089 58 03 W |
| Starr Grove School (historical) | School | 186 | Will | 41 21 50 N | 088 06 52 W |
| Starr School (historical) | School | 203 | Montgomery | 39 12 11 N | 089 18 27 W |
| Starr School (historical) | School | 220 | Warren | 41 01 45 N | 090 29 51 W |
| Starrock Missionary Baptist Church | Church | 181 | Cook | 41 52 13 N | 087 41 38 W |
| Stars and Stripes Park | Park | 182 | Cook | 41 47 57 N | 087 47 51 W |
| Starved Rock | Summit | 167 | La Salle | 41 19 16 N | 088 59 23 W |
| Starved Rock Airpark | Airport | 139 | La Salle | 41 19 30 N | 088 59 45 W |
| Starved Rock Lock and Dam | Dam | 140 | La Salle | 41 19 20 N | 088 59 06 W |
| Starved Rock Nature Preserve | Park | 138 | La Salle | 41 19 05 N | 089 02 19 W |
| Starved Rock Pool | Reservoir | 140 | La Salle | 41 19 20 N | 088 59 06 W |
| Starved Rock State Park | Park | 173 | La Salle | 41 18 47 N | 088 58 03 W |
| Starwano Cemetery | Cemetery | 205 | Stark | 41 00 15 N | 089 52 11 W |
| Stassen School (historical) | School | 225 | Will | 41 23 49 N | 087 48 22 W |
| State and Eighth Plaza Shopping Center | Locale | 179 | Adams | 39 55 35 N | 091 24 13 W |
| State Cemetery | Cemetery | 174 | Rock Island | 41 31 42 N | 090 24 11 W |
| State Correctional Center | Building | 197 | Livingston | 40 52 10 N | 088 38 10 W |
| State Fairgrounds Heliport | Airport | 177 | Sangamon | 39 50 15 N | 089 38 15 W |
| State Farm Park | Park | 259 | McLean | 40 27 20 N | 088 59 25 W |
| State Highway Paris Heliport | Airport | 225 | Edgar | 39 36 12 N | 087 42 44 W |
| State Historic Site Museum | Building | 241 | Henry | 41 11 45 N | 090 07 07 W |
| State Hospital Cemetery | Cemetery | 189 | Kankakee | 41 05 43 N | 087 50 30 W |
| State Hospital Cemetery | Cemetery | 207 | Kankakee | 41 14 06 N | 087 47 28 W |
| State Hospital Farm | Locale | 194 | Peoria | 40 38 46 N | 089 40 40 W |
| State House | Building | 159 | Fayette | 38 57 40 N | 089 05 38 W |
| State House Square | Locale | 181 | Madison | 38 54 25 N | 090 10 18 W |
| State Line Cemetery | Cemetery | 289 | Stephenson | 42 30 01 N | 089 24 24 W |
| State Line Cemetery | Cemetery | 290 | Stephenson | 42 30 01 N | 089 24 27 W |
| State Line Church | Church | 188 | Edgar | 39 39 45 N | 087 32 11 W |
| State Line Church | Church | 290 | Jo Daviess | 42 30 02 N | 089 24 23 W |
| State Line School (historical) | School | 288 | McHenry | 42 29 38 N | 088 40 42 W |
| State Line Station (historical) | Locale | 183 | Lake | 42 29 22 N | 087 49 00 W |
| State of Illinois | Civil | 191 | Logan | 40 00 01 N | 089 15 01 W |
| State of Illinois Building | Building | 182 | Cook | 41 53 05 N | 087 37 59 W |
| State of Illinois Center | Building | 181 | Cook | 41 53 07 N | 087 37 55 W |
| State Park Place | Populated Place | 128 | Madison | 38 39 31 N | 090 02 50 W |
| State Pond | Reservoir | 131 | Union | 37 28 20 N | 089 17 44 W |
| State Road | Populated Place | 206 | Champaign | 40 04 34 N | 087 57 30 W |
| State Road Cemetery | Cemetery | 240 | Stephenson | 42 16 35 N | 089 30 47 W |
| State Road Church | Church | 238 | Henry | 41 17 38 N | 090 02 27 W |
| State Road Church (historical) | Church | 238 | Stephenson | 42 16 35 N | 089 31 16 W |
| State Road Plaza Shopping Center | Locale | 187 | Cook | 41 43 55 N | 087 46 44 W |
| State Road School (historical) | School | 219 | Bureau | 41 19 24 N | 089 43 06 W |
| State Street Baptist Church | Church | 127 | St. Clair | 38 36 16 N | 090 05 35 W |
| State Street Baptist Church | Church | 230 | Winnebago | 42 15 59 N | 089 04 41 W |
| State Street Methodist Church | Church | 128 | St. Clair | 38 36 51 N | 090 07 25 W |
| State Street Methodist Episcopal Church (historical) | Church | 180 | Cook | 41 52 28 N | 087 37 41 W |
| State Street Mine | Mine | 241 | Boone | 42 16 36 N | 088 56 23 W |
| State Training School for Girls | School | 223 | Kane | 41 52 41 N | 088 17 56 W |