Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Stough Park | Park | 215 | DuPage | 41 47 59 N | 087 56 39 W |
| Stoune RLA Airport | Airport | 193 | Shelby | 39 28 24 N | 088 57 35 W |
| Stout Bridge | Bridge | 177 | Tazewell | 40 32 46 N | 089 21 32 W |
| Stout Cemetery | Cemetery | 177 | Sangamon | 39 41 05 N | 089 38 05 W |
| Stout Church (historical) | Church | 177 | Sangamon | 39 41 20 N | 089 38 06 W |
| Stouts Grove School (historical) | School | 238 | McLean | 40 32 05 N | 089 12 34 W |
| Stowe Elementary School | School | 184 | Cook | 41 54 45 N | 087 42 47 W |
| Stowe School (historical) | School | 216 | Henry | 41 24 05 N | 090 08 39 W |
| Stowell School (historical) | School | 191 | Henry | 41 33 57 N | 089 55 05 W |
| Stoy | Populated Place | 149 | Crawford | 38 59 51 N | 087 49 59 W |
| Straddle Creek | Stream | | Carroll | 42 05 25 N | 089 53 56 W |
| Strader Cemetery | Cemetery | 194 | McDonough | 40 22 36 N | 090 43 54 W |
| Straight Row School (historical) | School | 185 | Logan | 40 11 12 N | 089 16 25 W |
| Straight Way Baptist Church | Church | 127 | St. Clair | 38 35 42 N | 090 08 08 W |
| Strangers Home Missionary Baptist Church | Church | 182 | Cook | 41 46 45 N | 087 39 40 W |
| Strasburg | Populated Place | 194 | Shelby | 39 21 09 N | 088 37 09 W |
| Strasburg United Methodist Church | Church | 194 | Shelby | 39 21 11 N | 088 37 08 W |
| Strasma Park | Park | 189 | Kankakee | 41 05 02 N | 087 48 47 W |
| Strassburg Elementary School | School | 201 | Cook | 41 29 02 N | 087 33 58 W |
| Stratford | Populated Place | 252 | Ogle | 41 59 49 N | 089 29 27 W |
| Stratford Junior High School | School | 240 | DuPage | 41 56 33 N | 088 06 22 W |
| Stratford Plaza Shopping Center | Locale | 243 | DuPage | 41 57 04 N | 088 07 18 W |
| Stratford Revival Center Southside Move of God Church | Church | 187 | Cook | 41 43 37 N | 087 39 48 W |
| Stratford School | School | 199 | Lake | 42 09 58 N | 087 49 12 W |
| Stratford Square Shopping Center | Locale | 240 | DuPage | 41 56 56 N | 088 06 54 W |
| Strator Pond | Lake | 134 | Calhoun | 39 07 38 N | 090 41 08 W |
| Stratton | Populated Place | 148 | Jefferson | 38 26 44 N | 088 42 48 W |
| Stratton Building | Building | 182 | Sangamon | 39 47 54 N | 089 39 53 W |
| Straut | Populated Place | 202 | Pike | 39 26 36 N | 090 42 21 W |
| Straw School (historical) | School | 294 | Carroll | 42 09 42 N | 089 46 09 W |
| Strawberry Hill Plaza Shopping Center | Locale | 253 | Cook | 42 02 55 N | 088 06 20 W |
| Strawberry Hill Plaza Shopping Center | Locale | 223 | Cook | 42 00 26 N | 088 02 41 W |
| Strawberry Hollow | Valley | | Peoria | 40 48 59 N | 089 34 51 W |
| Strawberry Patch Christian Pre-School | School | 235 | DeKalb | 42 05 29 N | 088 51 03 W |
| Strawn | Populated Place | 235 | Livingston | 40 39 09 N | 088 23 47 W |
| Strawn Art Gallery | Building | 185 | Morgan | 39 43 56 N | 090 13 57 W |
| Strawn Cemetery | Cemetery | 235 | Livingston | 40 39 10 N | 088 24 14 W |
| Strawn Cemetery | Cemetery | 201 | Marshall | 41 00 09 N | 089 21 25 W |
| Strawn Creek | Stream | | Marshall | 40 58 29 N | 089 25 34 W |
| Strawn High School (historical) | School | 237 | Livingston | 40 39 09 N | 088 24 06 W |
| Strawn Post Office | Post Office | 234 | Livingston | 40 39 01 N | 088 23 46 W |
| Strawn School (historical) | School | 175 | La Salle | 41 20 12 N | 088 54 48 W |
| Strawn School (historical) | School | 203 | Marshall | 40 59 44 N | 089 21 30 W |
| Strawn School (historical) | School | 201 | Morgan | 39 45 44 N | 090 01 56 W |
| Strawn School (historical) | School | 213 | Putnam | 41 12 20 N | 089 15 31 W |
| Strawn United Methodist Church | Church | 236 | Livingston | 40 39 07 N | 088 23 52 W |
| Strawns Crossing | Populated Place | 192 | Morgan | 39 47 09 N | 090 09 03 W |
| Strawns Grove School (historical) | School | 193 | Morgan | 39 41 41 N | 090 15 52 W |
| Strayer School (historical) | School | 239 | Ford | 40 25 25 N | 088 00 08 W |
| Streadle | Populated Place | 174 | Sangamon | 39 51 12 N | 089 36 52 W |
| Streamwood | Populated Place | 246 | Cook | 42 01 32 N | 088 10 42 W |
| Streamwood Elementary School | School | 244 | Cook | 42 01 36 N | 088 10 12 W |
| Streamwood High School | School | 250 | Cook | 42 01 49 N | 088 11 53 W |
| Streamwood Oaks Golf Course | Locale | 239 | Cook | 42 01 29 N | 088 11 40 W |
| Streamwood Park | Park | 247 | Cook | 42 01 25 N | 088 09 34 W |
| Streamwood Shopping Center | Locale | 244 | Cook | 42 01 29 N | 088 10 48 W |
| Streamwood Village Hall | Building | 247 | Cook | 42 00 41 N | 088 10 17 W |
| Streator | Populated Place | 189 | La Salle | 41 07 15 N | 088 50 07 W |
| Streator Airport | Airport | 195 | La Salle | 41 07 43 N | 088 48 07 W |
| Streator City Hall | Building | 185 | La Salle | 41 07 08 N | 088 50 13 W |
| Streator Country Club | Locale | 189 | La Salle | 41 08 38 N | 088 51 06 W |
| Streator Post Office | Post Office | 188 | La Salle | 41 07 18 N | 088 49 58 W |
| Streator Public Library | Building | 187 | La Salle | 41 07 10 N | 088 50 05 W |
| Streator Township High School | School | 191 | La Salle | 41 07 37 N | 088 50 12 W |
| Streator Woodland School | School | 186 | Livingston | 41 03 38 N | 088 49 03 W |
| Streeter School (historical) | School | 238 | Mercer | 41 13 29 N | 090 27 18 W |
| Streeterville (subdivision) | Populated Place | 180 | Cook | 41 53 36 N | 087 37 19 W |
| Streeterville School (historical) | School | 194 | Kankakee | 41 00 42 N | 087 51 45 W |
| Streets Lake | Swamp | 270 | McHenry | 42 28 33 N | 088 23 37 W |
| Streff School (historical) | School | 229 | Iroquois | 40 33 36 N | 088 05 57 W |
| Streitmatter Cemetery | Cemetery | 227 | Peoria | 40 57 13 N | 089 43 01 W |
| Streitmatter School (historical) | School | 220 | Peoria | 40 57 36 N | 089 41 46 W |
| Strevey School (historical) | School | 203 | Iroquois | 40 41 46 N | 087 56 10 W |
| Strickland School (historical) | School | 196 | Moultrie | 39 33 53 N | 088 35 25 W |
| Stricklin Family Cemetery | Cemetery | 125 | Saline | 37 47 05 N | 088 36 11 W |
| String Prairie | Flat | 198 | Greene | 39 19 13 N | 090 19 20 W |
| Stringtown | Populated Place | 143 | Richland | 38 49 30 N | 087 59 01 W |
| Stringtown (historical) | School | 161 | Johnson | 37 28 50 N | 088 53 03 W |
| Stringtown Branch | Stream | | Moultrie | 39 42 47 N | 088 40 04 W |
| Stringtown Cemetery | Cemetery | 213 | Coles | 39 25 14 N | 088 06 55 W |
| Stringtown Cemetery | Cemetery | 207 | Piatt | 40 02 20 N | 088 37 18 W |
| Stringtown Cemetery | Cemetery | 205 | Stark | 40 59 21 N | 089 51 07 W |
| Stringtown School (historical) | School | 186 | Clark | 39 23 55 N | 087 40 31 W |
| Stringtown School (historical) | School | 214 | Coles | 39 25 13 N | 088 07 09 W |
| Stringtown School (historical) | School | 242 | Ford | 40 30 01 N | 088 12 15 W |
| Stringtown School (historical) | School | 157 | Marion | 38 37 42 N | 088 47 08 W |
| Stringtown School (historical) | School | 119 | Monroe | 38 07 16 N | 090 12 14 W |
| Stringtown School (historical) | School | 209 | Moultrie | 39 43 57 N | 088 43 11 W |
| Stringtown School (historical) | School | 208 | Piatt | 40 02 22 N | 088 36 20 W |
| Stringtown School (historical) | School | 133 | Randolph | 38 08 02 N | 089 53 08 W |
| Stringtown School (historical) | School | 207 | Stark | 40 59 21 N | 089 51 04 W |
| Stringtown School (historical) | School | 233 | Warren | 40 52 28 N | 090 29 56 W |
| Stringtown School (historical) | School | 133 | Williamson | 37 43 24 N | 089 03 11 W |
| Strode Cemetery | Cemetery | 183 | Sangamon | 39 54 27 N | 089 42 00 W |
| Strode Lake | Reservoir | 205 | Fulton | 40 35 05 N | 090 02 57 W |
| Strode School (historical) | School | 180 | Sangamon | 39 53 50 N | 089 41 49 W |
| Strohacker Park | Park | 184 | Cook | 41 47 38 N | 087 43 57 W |
| Strong Rock Missionary Baptist Church | Church | 183 | Cook | 41 46 45 N | 087 40 12 W |
| Strong School (historical) | School | 194 | Cook | 42 06 36 N | 087 53 23 W |
| Stronghurst | Populated Place | 206 | Henderson | 40 44 49 N | 090 54 15 W |
| Stroud Auditorium | Building | 241 | McLean | 40 30 56 N | 088 59 48 W |
| Stroud-Sehoskey Cemetery | Cemetery | 150 | Williamson | 37 45 59 N | 088 57 46 W |
| Stroyan Lake | Reservoir | 274 | Lee | 41 43 54 N | 088 57 30 W |
| Stroyan Lake Dam | Dam | 274 | Lee | 41 43 54 N | 088 57 30 W |
| Strubhar School (historical) | School | 231 | McLean | 40 35 18 N | 089 12 44 W |
| Strubler Park | Park | 216 | Kane | 41 45 48 N | 088 26 21 W |
| Structure Number 1 Dam | Dam | 162 | Schuyler | 40 04 12 N | 090 26 24 W |
| Structure Number 12 Dam | Dam | 154 | Schuyler | 40 03 12 N | 090 28 42 W |
| Structure Number 13 Dam | Dam | 159 | Schuyler | 40 03 18 N | 090 28 18 W |
| Structure Number 15 Dam | Dam | 162 | Schuyler | 40 03 42 N | 090 27 36 W |