Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Steuben School (historical) | School | 252 | Whiteside | 41 55 25 N | 089 46 05 W |
| Steve Creek | Stream | | Fayette | 38 50 23 N | 089 09 39 W |
| Stevens Building | Building | 181 | Cook | 41 52 56 N | 087 37 39 W |
| Stevens Building | Building | 261 | DeKalb | 41 55 59 N | 088 46 08 W |
| Stevens Cemetery | Cemetery | 208 | Adams | 39 52 59 N | 090 57 38 W |
| Stevens Cemetery | Cemetery | 216 | Lee | 41 39 32 N | 089 27 40 W |
| Stevens Creek | Stream | | Franklin | 37 55 20 N | 088 49 37 W |
| Stevens Creek | Stream | | Macon | 39 50 02 N | 089 00 26 W |
| Stevens Lake | Reservoir | 186 | Fulton | 40 31 58 N | 090 08 28 W |
| Stevens Park | Park | 212 | DuPage | 41 44 02 N | 087 55 34 W |
| Stevens Playground | Park | 208 | Kane | 41 45 58 N | 088 19 30 W |
| Stevenson Elementary School | School | 189 | Cook | 41 44 49 N | 087 43 55 W |
| Stevenson Elementary School | School | 193 | Cook | 41 54 13 N | 087 51 31 W |
| Stevenson Elementary School | School | 201 | Macon | 39 53 38 N | 088 56 41 W |
| Stevenson Elementary School | School | 257 | McLean | 40 29 40 N | 088 56 42 W |
| Stevenson Hall | Building | 237 | McLean | 40 30 29 N | 088 59 20 W |
| Stevenson Hall | Building | 246 | McLean | 40 29 28 N | 088 59 31 W |
| Stevenson Park | Park | 188 | Cook | 41 44 18 N | 087 46 18 W |
| Stevenson Park | Park | 190 | Cook | 41 53 16 N | 087 46 40 W |
| Stevenson Park | Park | 192 | Cook | 41 52 57 N | 087 52 17 W |
| Stevenson Playground | Park | 190 | Cook | 41 53 16 N | 087 46 41 W |
| Stevenson Pond | Lake | 137 | Pike | 39 34 42 N | 091 09 38 W |
| Stevenson School (historical) | School | 184 | Fulton | 40 14 45 N | 090 14 18 W |
| Stevenson Towers North | Building | 266 | DeKalb | 41 56 16 N | 088 46 48 W |
| Stevenson Towers South | Building | 267 | DeKalb | 41 56 13 N | 088 46 48 W |
| Stevenson Townhall | Building | 159 | Marion | 38 37 15 N | 088 51 33 W |
| Steward | Populated Place | 250 | Lee | 41 50 52 N | 089 01 12 W |
| Steward Cemetery | Cemetery | 207 | Adams | 39 46 32 N | 091 11 09 W |
| Steward Cemetery | Cemetery | 250 | Lee | 41 50 53 N | 089 01 26 W |
| Steward Creek | Stream | | Lee | 41 53 24 N | 089 06 08 W |
| Steward Elementary School | School | 249 | Lee | 41 50 48 N | 089 01 24 W |
| Steward School (historical) | School | 158 | Marion | 38 38 03 N | 089 06 19 W |
| Stewardson | Populated Place | 196 | Shelby | 39 15 47 N | 088 37 47 W |
| Stewardson Cemetery | Cemetery | 200 | Shelby | 39 15 22 N | 088 38 15 W |
| Stewardson United Methodist Church | Church | 195 | Shelby | 39 15 43 N | 088 37 47 W |
| Stewardson-Strasburg High School | School | 193 | Shelby | 39 18 03 N | 088 37 05 W |
| Stewardsville (historical) | Populated Place | 203 | McDonough | 40 18 27 N | 090 34 56 W |
| Stewart Airport | Airport | 223 | Edgar | 39 35 05 N | 087 41 54 W |
| Stewart Cemetery | Cemetery | 221 | Coles | 39 26 29 N | 088 03 17 W |
| Stewart Cemetery | Cemetery | 142 | Johnson | 37 26 58 N | 088 54 43 W |
| Stewart Cemetery | Cemetery | 186 | Macoupin | 39 00 09 N | 090 06 41 W |
| Stewart Cemetery | Cemetery | 228 | McLean | 40 21 52 N | 088 57 57 W |
| Stewart Cemetery | Cemetery | 208 | Pike | 39 45 24 N | 091 02 23 W |
| Stewart Cemetery | Cemetery | 174 | Sangamon | 39 55 58 N | 089 34 57 W |
| Stewart Cemetery | Cemetery | 149 | Wayne | 38 16 59 N | 088 13 23 W |
| Stewart Crossing Shopping Center | Locale | 238 | Kane | 41 55 12 N | 088 16 38 W |
| Stewart Elementary School | School | 180 | Cook | 41 57 52 N | 087 39 20 W |
| Stewart Heliport | Airport | 219 | Winnebago | 42 16 15 N | 089 05 44 W |
| Stewart Lake | Lake | 132 | Mason | 40 08 40 N | 090 16 22 W |
| Stewart Mine | Mine | 143 | Hardin | 37 28 28 N | 088 24 17 W |
| Stewart Ridge (subdivision) | Populated Place | 189 | Cook | 41 40 26 N | 087 38 01 W |
| Stewart Ridge Church | Church | 214 | Cook | 41 35 13 N | 087 48 41 W |
| Stewart Ridge Station | Locale | 189 | Cook | 41 40 27 N | 087 37 55 W |
| Stewart School (historical) | School | 255 | Carroll | 42 00 43 N | 089 41 10 W |
| Stewart School (historical) | School | 222 | Champaign | 40 08 46 N | 088 13 13 W |
| Stewart School (historical) | School | 215 | Champaign | 39 58 56 N | 088 17 37 W |
| Stewart School (historical) | School | 212 | Edgar | 39 40 52 N | 087 46 46 W |
| Stewart School (historical) | School | 219 | Henry | 41 26 00 N | 090 20 52 W |
| Stewart School (historical) | School | 277 | Kane | 41 55 33 N | 088 28 44 W |
| Stewart Shaft | Mine | 121 | Hardin | 37 27 07 N | 088 20 13 W |
| Stice Cemetery | Cemetery | 238 | Warren | 40 39 13 N | 090 38 14 W |
| Stickey Lake | Lake | 133 | Fulton | 40 12 25 N | 090 11 16 W |
| Stickle Methodist Episcopal Church (historical) | Church | 216 | McDonough | 40 31 15 N | 090 42 48 W |
| Stickler School (historical) | School | 217 | McDonough | 40 31 24 N | 090 44 18 W |
| Stickney | Populated Place | 184 | Cook | 41 49 17 N | 087 46 58 W |
| Stickney School (historical) | School | 241 | Henry | 41 10 13 N | 090 16 00 W |
| Stickney Village Hall | Building | 185 | Cook | 41 49 16 N | 087 47 13 W |
| Stienstra Quarry | Mine | 242 | Jo Daviess | 42 28 36 N | 090 19 28 W |
| Stiles Elementary School | School | 239 | Winnebago | 42 16 25 N | 089 09 55 W |
| Still Gymnasium | Building | 259 | DeKalb | 41 56 06 N | 088 45 46 W |
| Still Hall | Building | 259 | DeKalb | 41 56 04 N | 088 45 46 W |
| Still Meadows | Populated Place | 248 | Kane | 41 53 06 N | 088 26 44 W |
| Stilley Cemetery | Cemetery | 135 | Williamson | 37 50 47 N | 088 50 53 W |
| Stillhouse Branch | Stream | | Pike | 39 36 13 N | 091 04 35 W |
| Stillhouse Hollow | Valley | | Saline | 37 41 05 N | 088 28 03 W |
| Stillman Creek | Stream | | Ogle | 42 07 34 N | 089 13 51 W |
| Stillman Park | Park | 268 | Cook | 42 05 38 N | 088 10 07 W |
| Stillman School (historical) | School | 238 | Ogle | 42 08 07 N | 089 12 46 W |
| Stillman Valley | Populated Place | 217 | Ogle | 42 06 26 N | 089 10 45 W |
| Stillman Valley Cemetery | Cemetery | 213 | Ogle | 42 06 45 N | 089 10 43 W |
| Stillman Valley High School | School | 232 | Ogle | 42 06 06 N | 089 10 39 W |
| Stillwell | Populated Place | 204 | Hancock | 40 13 07 N | 091 10 59 W |
| Stillwell Family Cemetery | Cemetery | 129 | Wabash | 38 30 01 N | 087 44 45 W |
| Stillwell Post Office (historical) | Post Office | 205 | Hancock | 40 13 07 N | 091 11 04 W |
| Stimes School (historical) | School | 276 | Boone | 42 22 29 N | 088 44 58 W |
| Stine Cemetery | Cemetery | 141 | Wayne | 38 30 45 N | 088 26 57 W |
| Stine School (historical) | School | 235 | Henderson | 40 40 08 N | 090 54 14 W |
| Stinking Creek | Stream | | White | 38 15 07 N | 088 06 12 W |
| Stinson Memorial Library | Building | 198 | Union | 37 27 30 N | 089 15 06 W |
| Stinson-Oak Grove Church | Church | 152 | Wayne | 38 29 24 N | 088 33 54 W |
| Stinsonian Cemetery | Cemetery | 274 | Ogle | 42 01 25 N | 089 13 03 W |
| Stipe Cemetery | Cemetery | 149 | Randolph | 38 01 58 N | 089 53 46 W |
| Stipes Hall | Building | 199 | McDonough | 40 28 08 N | 090 41 13 W |
| Stipp Cemetery | Cemetery | 156 | Clay | 38 44 23 N | 088 40 02 W |
| Stiritz | Populated Place | 124 | Williamson | 37 50 10 N | 088 56 54 W |
| Stirrup Grove Post Office (historical) | Post Office | 208 | Macoupin | 39 30 02 N | 089 55 29 W |
| Stites Cemetery | Cemetery | 188 | Fulton | 40 24 02 N | 090 19 52 W |
| Stitt School (historical) | School | 181 | Cumberland | 39 18 28 N | 088 13 20 W |
| Stiver Springs | Spring | 156 | Lawrence | 38 41 18 N | 087 47 02 W |
| Stock Elementary School | School | 198 | Cook | 42 01 00 N | 087 48 51 W |
| Stock Pavilion (historical) | Building | 178 | Cook | 41 46 33 N | 087 34 35 W |
| Stockdale | Populated Place | 159 | Grundy | 41 21 04 N | 088 29 33 W |
| Stockham Place Park | Park | 180 | Cook | 42 02 23 N | 087 40 25 W |
| Stockland | Populated Place | 205 | Iroquois | 40 36 52 N | 087 35 34 W |
| Stockland Post Office | Post Office | 204 | Iroquois | 40 36 52 N | 087 35 32 W |
| Stockland School (historical) | School | 144 | Pike | 39 27 29 N | 090 53 23 W |
| Stockton | Populated Place | 303 | Jo Daviess | 42 20 59 N | 090 00 24 W |
| Stockton Airport | Airport | 289 | Jo Daviess | 42 19 26 N | 089 59 34 W |
| Stockton Cemetery | Cemetery | 212 | Henderson | 40 57 10 N | 090 51 49 W |
| Stockton Center School (historical) | School | 273 | Jo Daviess | 42 19 42 N | 090 02 22 W |