Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Stores | Locale | 200 | Whiteside | 41 44 37 N | 089 37 41 W |
| Storks at Play | Locale | 181 | Cook | 41 55 21 N | 087 38 08 W |
| Storybrook Country Club | Locale | 185 | Jo Daviess | 42 14 08 N | 090 15 43 W |
| Stratford Plaza Shopping Center | Locale | 243 | DuPage | 41 57 04 N | 088 07 18 W |
| Stratford Square Shopping Center | Locale | 240 | DuPage | 41 56 56 N | 088 06 54 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 |
| Streamwood Oaks Golf Course | Locale | 239 | Cook | 42 01 29 N | 088 11 40 W |
| Streamwood Shopping Center | Locale | 244 | Cook | 42 01 29 N | 088 10 48 W |
| Streator Country Club | Locale | 189 | La Salle | 41 08 38 N | 088 51 06 W |
| Stubblefield Gas Storage Field | Locale | 161 | Bond | 38 49 24 N | 089 29 13 W |
| Stump Lake Public Access Area | Locale | 128 | Jersey | 39 01 08 N | 090 33 52 W |
| Sugar Creek Golf Course | Locale | 201 | DuPage | 41 52 19 N | 087 57 56 W |
| Summit Shopping Center | Locale | 189 | Cook | 41 44 47 N | 087 44 32 W |
| Summit Square Shopping Center | Locale | 240 | Cook | 42 02 51 N | 088 15 35 W |
| Summit Station (historical) | Locale | 215 | Will | 41 33 13 N | 087 50 03 W |
| Sunny Crest Campground | Locale | 243 | Ogle | 41 59 29 N | 089 28 32 W |
| Sunnyland Plaza Shopping Center | Locale | 218 | Tazewell | 40 41 30 N | 089 28 55 W |
| Sunrise Point Picnic Area | Locale | 134 | Hamilton | 38 03 39 N | 088 24 23 W |
| Sunset Center Shopping Center | Locale | 253 | Kane | 42 01 34 N | 088 18 23 W |
| Sunset Hill Golf Club | Locale | 276 | Ogle | 42 03 20 N | 089 26 18 W |
| Sunset Hills Country Club | Locale | 158 | Madison | 38 46 43 N | 089 59 52 W |
| Sunset Hills Golf Course | Locale | 192 | Tazewell | 40 32 36 N | 089 36 45 W |
| Sunset Landing | Locale | 132 | Calhoun | 38 56 45 N | 090 39 49 W |
| Sunset Marina | Locale | 171 | Rock Island | 41 29 06 N | 090 36 20 W |
| Sunset Picnic Area | Locale | 163 | Henderson | 40 57 48 N | 090 56 26 W |
| Sunset Plaza Shopping Center | Locale | 192 | Tazewell | 40 32 59 N | 089 36 33 W |
| Sunset Ridge Country Club | Locale | 200 | Cook | 42 06 48 N | 087 47 45 W |
| Sunset Speedway (historical) | Locale | 131 | Madison | 38 45 30 N | 090 02 48 W |
| Sunset Valley Golf Club | Locale | 195 | Lake | 42 10 52 N | 087 48 47 W |