Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Souls Harbor Apostolic Church | Church | 181 | Greene | 39 26 42 N | 090 24 01 W |
| South Branch Addition (subdivision) | Populated Place | 181 | Cook | 41 51 01 N | 087 38 28 W |
| South Commons (subdivision) | Populated Place | 181 | Cook | 41 50 33 N | 087 37 19 W |
| South Shore Community Academy | School | 181 | Cook | 41 45 22 N | 087 34 45 W |
| South Shore High School | School | 181 | Cook | 41 45 22 N | 087 34 45 W |
| South Water Market | Locale | 181 | Cook | 41 51 43 N | 087 39 14 W |
| Spangle Cemetery | Cemetery | 181 | Madison | 38 58 36 N | 089 46 53 W |
| Spangle School (historical) | School | 181 | Madison | 38 58 33 N | 089 47 18 W |
| Spanish American Commercial School | School | 181 | Cook | 41 54 36 N | 087 40 38 W |
| Spanish Missionary Baptist Church | Church | 181 | Cook | 41 51 22 N | 087 39 35 W |
| Spertus College of Judaica | School | 181 | Cook | 41 52 26 N | 087 37 28 W |
| Spirit of Love Missionary Baptist Church | Church | 181 | Cook | 41 47 01 N | 087 39 50 W |
| Spirit of Truth Church | Church | 181 | Cook | 41 52 24 N | 087 42 45 W |
| Spiritual Light Missionary Baptist Church | Church | 181 | Cook | 41 46 52 N | 087 35 34 W |
| Spring Lake (historical) | Reservoir | 181 | La Salle | 41 08 01 N | 088 51 57 W |
| Springer School (historical) | School | 181 | Cass | 39 55 06 N | 090 18 52 W |
| Springfield High School | School | 181 | Sangamon | 39 48 03 N | 089 39 39 W |
| Springfield Post Office | Post Office | 181 | Sangamon | 39 47 57 N | 089 38 50 W |
| Stafford Cemetery | Cemetery | 181 | Christian | 39 46 43 N | 089 11 45 W |
| Starlight Missionary Baptist Church | Church | 181 | Cook | 41 52 17 N | 087 41 46 W |
| Starrock Missionary Baptist Church | Church | 181 | Cook | 41 52 13 N | 087 41 38 W |
| State House Square | Locale | 181 | Madison | 38 54 25 N | 090 10 18 W |
| State of Illinois Center | Building | 181 | Cook | 41 53 07 N | 087 37 55 W |
| Staunton Country Club Lake | Reservoir | 181 | Macoupin | 39 02 42 N | 089 48 36 W |
| Staunton Country Club Lake Dam | Dam | 181 | Macoupin | 39 02 42 N | 089 48 36 W |
| Stehman School Playground | Park | 181 | Cook | 41 56 04 N | 087 42 30 W |
| Stevens Building | Building | 181 | Cook | 41 52 56 N | 087 37 39 W |
| Stitt School (historical) | School | 181 | Cumberland | 39 18 28 N | 088 13 20 W |
| Stony Creek Golf Course | Locale | 181 | Cook | 41 42 29 N | 087 46 19 W |
| Stony Island Park | Park | 181 | Cook | 41 44 07 N | 087 34 28 W |