Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Spencer | Populated Place | 141 | Pike | 39 42 39 N | 091 15 58 W |
| Spencer | Populated Place | 215 | Will | 41 29 53 N | 087 56 30 W |
| Spencer Bridge (historical) | Bridge | 136 | Crawford | 38 53 37 N | 087 52 10 W |
| Spencer Elementary School | School | 185 | Cook | 41 53 05 N | 087 45 02 W |
| Spencer Heights | Populated Place | 130 | Pulaski | 37 07 38 N | 089 11 41 W |
| Spencer Heights Memorial Cemetery | Cemetery | 129 | Pulaski | 37 07 23 N | 089 11 29 W |
| Spencer Park | Park | 229 | Boone | 42 15 31 N | 088 52 00 W |
| Spencer Park | Park | 204 | Macon | 39 51 59 N | 088 54 25 W |
| Spencer School | School | 203 | Macon | 39 51 51 N | 088 54 27 W |
| Spencer School (historical) | School | 180 | Greene | 39 30 39 N | 090 14 44 W |
| Spencer School (historical) | School | 256 | Lee | 41 51 58 N | 089 15 53 W |
| Spencer School (historical) | School | 219 | Will | 41 29 28 N | 087 56 26 W |
| Spencer T Olin Golf Course | Locale | 150 | Madison | 38 54 29 N | 090 06 18 W |
| Spertus College of Judaica | School | 181 | Cook | 41 52 26 N | 087 37 28 W |
| Spider Branch | Stream | | Pike | 39 44 56 N | 091 09 09 W |
| Spidle Cemetery | Cemetery | 145 | Wabash | 38 30 39 N | 087 44 33 W |
| Spiers Island | Island | 191 | Kane | 41 46 08 N | 088 18 33 W |
| Spiker School (historical) | School | 228 | McDonough | 40 37 10 N | 090 53 06 W |
| Spiketown School (historical) | School | 182 | Clark | 39 22 58 N | 087 45 08 W |
| Spiller Cemetery | Cemetery | 136 | Williamson | 37 45 36 N | 088 59 12 W |
| Spillertown | Populated Place | 147 | Williamson | 37 45 59 N | 088 55 10 W |
| Spillman Creek | Stream | | Hancock | 40 37 58 N | 091 12 39 W |
| Spillway 531 | Dam | 161 | Will | 41 18 02 N | 088 09 05 W |
| Spillway Access Area | Park | 171 | Shelby | 39 24 25 N | 088 46 47 W |
| Spillway Public Use Area | Park | 119 | Franklin | 38 01 51 N | 088 57 37 W |
| Spillway Recreation Area | Park | 131 | Clinton | 38 37 05 N | 089 21 19 W |
| Spin Lake | Reservoir | 220 | McLean | 40 33 26 N | 089 15 25 W |
| Spin Lake Dam | Dam | 220 | McLean | 40 33 24 N | 089 15 24 W |
| Spindler Park | Park | 158 | Madison | 38 44 16 N | 089 41 10 W |
| Spiral Temple of Truth | Church | 182 | Cook | 41 43 54 N | 087 36 18 W |
| Spires | Populated Place | 224 | Woodford | 40 52 35 N | 088 57 37 W |
| Spirit and Truth Fellowship Church | Church | 182 | Cook | 41 55 15 N | 087 42 01 W |
| Spirit of Faith Missionary Baptist Church | Church | 182 | Cook | 41 45 53 N | 087 39 14 W |
| Spirit of Life Christian School | School | 221 | Lake | 42 28 44 N | 087 52 11 W |
| Spirit of Love Missionary Baptist Church | Church | 181 | Cook | 41 47 01 N | 087 39 50 W |
| Spirit of Truth Church | Church | 183 | Cook | 41 46 36 N | 087 39 51 W |
| Spirit of Truth Church | Church | 181 | Cook | 41 52 24 N | 087 42 45 W |
| Spirit Trail Park | Park | 205 | Cook | 41 30 36 N | 087 41 56 W |
| Spiritual Light Missionary Baptist Church | Church | 181 | Cook | 41 46 52 N | 087 35 34 W |
| Spiritual Rock Missionary Baptist Church | Church | 186 | Cook | 41 54 08 N | 087 44 58 W |
| Spirtual Israel Church | Church | 189 | Cook | 41 54 06 N | 087 46 02 W |
| Spitler Woods Nature Preserve | Park | 197 | Macon | 39 46 38 N | 088 51 23 W |
| Spitler Woods State Park | Park | 199 | Macon | 39 46 40 N | 088 51 25 W |
| Spitz-Bilgere Cemetery | Cemetery | 137 | St. Clair | 38 17 12 N | 089 51 44 W |
| Split Rail Farm | Populated Place | 254 | Kane | 41 57 54 N | 088 23 34 W |
| Split Rock Lake | Lake | 137 | La Salle | 41 19 46 N | 089 03 51 W |
| Spoerl Park | Park | 273 | McHenry | 42 13 04 N | 088 17 42 W |
| Spoon Creek | Stream | | Morgan | 39 37 57 N | 090 19 52 W |
| Spoon Lake | Reservoir | 198 | Knox | 40 57 04 N | 090 07 29 W |
| Spoon Lake Dam | Dam | 198 | Knox | 40 57 04 N | 090 07 29 W |
| Spoon River | Stream | | Champaign | 40 09 09 N | 088 01 54 W |
| Spoon River | Stream | | Fulton | 40 18 25 N | 090 04 14 W |
| Spoon River College Extension | School | 212 | McDonough | 40 27 24 N | 090 40 32 W |
| Spoon River Junior College | School | 200 | Fulton | 40 31 41 N | 090 04 20 W |
| Spoon River Public Library | Building | 207 | Fulton | 40 29 31 N | 090 11 46 W |
| Spoon River Valley Senior High School | School | 211 | Fulton | 40 42 09 N | 090 09 22 W |
| Sporting Club | Building | 178 | Cook | 41 53 09 N | 087 37 19 W |
| Sportsman Country Club | Locale | 210 | Cook | 42 08 10 N | 087 51 57 W |
| Sportsman Lake | Lake | 149 | St. Clair | 38 22 31 N | 090 00 52 W |
| Sportsman Lake | Reservoir | 144 | Clinton | 38 38 22 N | 089 39 46 W |
| Sportsman Lake | Reservoir | 146 | Madison | 38 45 22 N | 089 45 51 W |
| Sportsman Lake | Reservoir | 156 | Marion | 38 34 53 N | 088 55 48 W |
| Sportsman Lake Dam | Dam | 144 | Clinton | 38 38 22 N | 089 39 46 W |
| Sportsman Lake Dam | Dam | 156 | Marion | 38 34 53 N | 088 55 48 W |
| Sportsmans Park | Park | 213 | DuPage | 41 45 45 N | 088 09 37 W |
| Sportsmans Park Racetrack | Locale | 183 | Cook | 41 49 50 N | 087 45 05 W |
| Spott School (historical) | School | 177 | Clark | 39 25 59 N | 087 38 11 W |
| Spradling Cemetery | Cemetery | 186 | La Salle | 41 29 31 N | 088 40 00 W |
| Sprague School (historical) | School | 194 | Will | 41 39 24 N | 088 04 47 W |
| Spratts Lake | Lake | 180 | Jo Daviess | 42 21 36 N | 090 26 08 W |
| Sprind Grove Cemetery | Cemetery | 235 | McHenry | 42 26 43 N | 088 14 31 W |
| Spring Arbor Lake | Reservoir | 163 | Jackson | 37 39 00 N | 089 10 06 W |
| Spring Avenue School | School | 199 | Cook | 41 47 43 N | 087 52 28 W |
| Spring Bank School (historical) | School | 178 | Logan | 40 04 37 N | 089 30 09 W |
| Spring Bay | Populated Place | 143 | Woodford | 40 49 28 N | 089 31 20 W |
| Spring Bay Cemetery | Cemetery | 161 | Woodford | 40 49 26 N | 089 30 55 W |
| Spring Bay Fen Nature Preserve | Park | 137 | Woodford | 40 47 08 N | 089 32 17 W |
| Spring Bay Township Hall | Building | 166 | Woodford | 40 47 02 N | 089 31 17 W |
| Spring Bluff Elementary School | School | 198 | Lake | 42 28 59 N | 087 49 32 W |
| Spring Bluff Forest Preserve | Park | 180 | Lake | 42 29 15 N | 087 48 37 W |
| Spring Branch | Stream | | Bond | 38 46 14 N | 089 15 18 W |
| Spring Branch | Stream | | Clay | 38 45 14 N | 088 22 06 W |
| Spring Branch | Stream | | Pike | 39 46 50 N | 090 41 56 W |
| Spring Branch | Stream | | Pope | 37 31 01 N | 088 39 19 W |
| Spring Branch | Stream | | Stephenson | 42 14 50 N | 089 47 25 W |
| Spring Branch State Conservation Area | Forest | 135 | Peoria | 40 56 42 N | 089 27 53 W |
| Spring Brook | Stream | | DuPage | 41 49 38 N | 088 10 59 W |
| Spring Brook | Stream | | DuPage | 41 58 17 N | 087 59 30 W |
| Spring Brook | Stream | | La Salle | 41 17 55 N | 088 37 33 W |
| Spring Brook | Stream | | Whiteside | 41 51 23 N | 090 06 31 W |
| Spring Brook | Stream | | Will | 41 42 07 N | 088 09 18 W |
| Spring Brook Airport | Airport | 154 | La Salle | 41 18 02 N | 088 38 08 W |
| Spring Brook Golf Course | Locale | 212 | DuPage | 41 43 45 N | 088 11 25 W |
| Spring Brook Marina | Locale | 147 | La Salle | 41 17 56 N | 088 37 44 W |
| Spring Brook Park | Park | 209 | DuPage | 41 58 10 N | 088 01 20 W |
| Spring Brook School (historical) | School | 211 | DuPage | 41 44 24 N | 088 10 03 W |
| Spring Creek | Stream | | Boone | 42 14 00 N | 088 42 18 W |
| Spring Creek | Stream | | Bureau | 41 18 44 N | 089 11 43 W |
| Spring Creek | Stream | | Christian | 39 34 56 N | 089 12 26 W |
| Spring Creek | Stream | | Hancock | 40 35 02 N | 091 02 24 W |
| Spring Creek | Stream | | Henry | 41 28 13 N | 090 04 26 W |
| Spring Creek | Stream | | Iroquois | 40 49 24 N | 087 49 44 W |
| Spring Creek | Stream | | Jackson | 37 50 59 N | 089 31 03 W |
| Spring Creek | Stream | | Jersey | 39 04 00 N | 090 30 24 W |
| Spring Creek | Stream | | Jo Daviess | 42 31 43 N | 089 44 08 W |
| Spring Creek | Stream | | Kankakee | 41 04 43 N | 087 47 26 W |
| Spring Creek | Stream | | Macon | 39 49 52 N | 088 58 21 W |
| Spring Creek | Stream | | Macon | 39 44 00 N | 089 06 53 W |
| Spring Creek | Stream | | Macon | 39 52 21 N | 088 59 26 W |
| Spring Creek | Stream | | Macoupin | 39 06 26 N | 089 46 15 W |