Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Spring Valley Cemetery | Cemetery | 273 | Carroll | 42 11 06 N | 089 48 36 W |
| Spring Valley Cemetery | Cemetery | 201 | Tazewell | 40 33 16 N | 089 30 42 W |
| Spring Valley Church | Church | 182 | Adams | 39 53 46 N | 090 58 44 W |
| Spring Valley Church | Church | 144 | Saline | 37 37 44 N | 088 30 30 W |
| Spring Valley Creek | Stream | | Saline | 37 40 25 N | 088 28 55 W |
| Spring Valley Estates Lake | Reservoir | 193 | Jersey | 38 59 48 N | 090 24 06 W |
| Spring Valley Estates Lake Dam | Dam | 193 | Jersey | 38 59 48 N | 090 24 06 W |
| Spring Valley Lake | Reservoir | 250 | Kane | 41 58 36 N | 088 23 06 W |
| Spring Valley Lake Dam | Dam | 250 | Kane | 41 58 36 N | 088 23 06 W |
| Spring Valley Methodist Cemetery | Cemetery | 197 | Whiteside | 41 54 20 N | 090 02 11 W |
| Spring Valley Nature Sanctuary | Park | 219 | Cook | 42 01 27 N | 088 03 15 W |
| Spring Valley Park | Park | 235 | DuPage | 41 56 27 N | 088 10 16 W |
| Spring Valley Post Office | Post Office | 183 | Bureau | 41 19 33 N | 089 11 59 W |
| Spring Valley Presbyterian Cemetery | Cemetery | 219 | Whiteside | 41 54 08 N | 090 00 59 W |
| Spring Valley School (historical) | School | 183 | Adams | 39 53 47 N | 090 58 43 W |
| Spring Valley School (historical) | School | 274 | Carroll | 42 11 05 N | 089 46 31 W |
| Spring Valley School (historical) | School | 258 | Jo Daviess | 42 19 14 N | 090 00 34 W |
| Spring Valley School (historical) | School | 171 | Pike | 39 42 41 N | 091 03 49 W |
| Spring Valley School (historical) | School | 120 | Saline | 37 37 16 N | 088 30 31 W |
| Spring Valley School (historical) | School | 194 | Whiteside | 41 54 16 N | 090 02 10 W |
| Spring Wood Middle School | School | 239 | DuPage | 41 58 22 N | 088 07 44 W |
| Springbrook Crossings Park | Park | 201 | Will | 41 43 14 N | 088 10 05 W |
| Springbrook Shopping Center | Locale | 219 | DuPage | 41 57 22 N | 088 04 33 W |
| Springdale Cemetery | Cemetery | 206 | Peoria | 40 43 37 N | 089 33 58 W |
| Springdale Park | Park | 199 | Cook | 41 47 40 N | 087 53 49 W |
| Springdale School (historical) | School | 270 | Ogle | 42 04 04 N | 089 36 24 W |
| Springer Cemetery | Cemetery | 150 | Hamilton | 38 10 00 N | 088 25 32 W |
| Springer Cemetery | Cemetery | 182 | Livingston | 40 59 03 N | 088 47 16 W |
| Springer Cemetery | Cemetery | 178 | Williamson | 37 36 31 N | 088 54 47 W |
| Springer Church | Church | 165 | Jefferson | 38 26 14 N | 089 03 04 W |
| Springer School (historical) | School | 181 | Cass | 39 55 06 N | 090 18 52 W |
| Springer School (historical) | School | 189 | Cass | 39 56 41 N | 090 10 53 W |
| Springer School (historical) | School | 165 | Jefferson | 38 25 48 N | 089 03 09 W |
| Springer Station | Populated Place | 117 | White | 38 10 47 N | 088 21 06 W |
| Springerton | Populated Place | 120 | White | 38 10 46 N | 088 21 15 W |
| Springerton Cemetery | Cemetery | 132 | White | 38 10 43 N | 088 21 34 W |
| Springfield | Populated Place | 182 | Sangamon | 39 48 06 N | 089 38 37 W |
| Springfield Baptist Church | Church | 182 | Cook | 42 03 08 N | 087 41 49 W |
| Springfield City Hall | Building | 182 | Sangamon | 39 47 56 N | 089 38 39 W |
| Springfield Elementary School | School | 187 | Cook | 41 37 36 N | 087 42 57 W |
| Springfield High School | School | 181 | Sangamon | 39 48 03 N | 089 39 39 W |
| Springfield Junior College | School | 182 | Sangamon | 39 49 12 N | 089 38 42 W |
| Springfield Park | Park | 234 | DuPage | 41 57 29 N | 088 05 59 W |
| Springfield Post Office | Post Office | 181 | Sangamon | 39 47 57 N | 089 38 50 W |
| Springfield Southeast High School | School | 180 | Sangamon | 39 46 43 N | 089 37 15 W |
| Springfield Southwest Airpark | Airport | 193 | Sangamon | 39 44 13 N | 089 48 35 W |
| Springhill Cemetery | Cemetery | 192 | Vermilion | 40 08 45 N | 087 37 26 W |
| Springhill Church | Church | 138 | Williamson | 37 38 54 N | 088 45 51 W |
| Springhill Creek | Stream | | Tazewell | 40 32 33 N | 089 24 05 W |
| Springhill Park | Park | 231 | DuPage | 41 58 39 N | 088 03 42 W |
| Springhill Park | Park | 218 | DuPage | 41 46 53 N | 088 07 35 W |
| Springley Family Cemetery | Cemetery | 151 | Madison | 38 51 22 N | 090 01 40 W |
| Springman Junior High School | School | 202 | Cook | 42 03 52 N | 087 49 27 W |
| Springmore School | School | 133 | Jackson | 37 43 48 N | 089 13 27 W |
| Springs School (historical) | School | 167 | Jasper | 39 00 22 N | 088 11 23 W |
| Springtown Cemetery | Cemetery | 154 | Richland | 38 47 53 N | 088 00 17 W |
| Springtown School | School | 233 | Warren | 40 52 32 N | 090 29 55 W |
| Springtown School (historical) | School | 201 | Fulton | 40 31 25 N | 090 09 38 W |
| Springvale School (historical) | School | 167 | Randolph | 37 53 15 N | 089 42 56 W |
| Springville | Populated Place | 124 | Union | 37 22 28 N | 089 16 03 W |
| Sprinkleburg School (historical) | School | 207 | Putnam | 41 10 35 N | 089 16 10 W |
| Spruce Park | Park | 180 | Cook | 41 47 55 N | 087 35 24 W |
| Sprucewood Healthcare Center | Hospital | 207 | McDonough | 40 26 53 N | 090 40 34 W |
| Spry Elementary School | School | 182 | Cook | 41 50 51 N | 087 41 57 W |
| Spunk School (historical) | School | 183 | Fayette | 39 04 31 N | 089 14 12 W |
| Spunky Ridge | Ridge | 194 | Brown | 39 54 24 N | 090 35 26 W |
| Squankum School (historical) | School | 221 | Vermilion | 40 22 46 N | 087 44 28 W |
| Squaw Creek | Stream | | Lake | 42 23 54 N | 088 09 24 W |
| Squaw Island | Island | 128 | Calhoun | 38 56 25 N | 090 29 27 W |
| Squaw Prairie School (historical) | School | 241 | Boone | 42 17 30 N | 088 49 20 W |
| Squires (subdivision) | Populated Place | 267 | Lake | 42 10 18 N | 088 05 28 W |
| Squires School (historical) | School | 209 | Kankakee | 41 13 23 N | 087 34 23 W |
| Squires School (historical) | School | 201 | Kendall | 41 42 06 N | 088 18 45 W |
| Squirrel Creek | Stream | | Fulton | 40 18 15 N | 090 16 35 W |
| Squirrel Grove Mound | Summit | 355 | Jo Daviess | 42 29 45 N | 090 08 52 W |
| Staab Pond | Reservoir | 176 | Peoria | 40 54 06 N | 089 34 30 W |
| Staab Pond Dam | Dam | 176 | Peoria | 40 54 06 N | 089 34 30 W |
| Staats Theater (historical) | Building | 179 | Cook | 41 52 57 N | 087 38 39 W |
| Stacy Park | Park | 236 | DuPage | 41 53 24 N | 088 04 07 W |
| Stacy Woods | Woods | 235 | DuPage | 41 53 26 N | 088 04 11 W |
| Stadium Terrace Playing Field | Park | 224 | Champaign | 40 06 02 N | 088 14 24 W |
| Staff Cemetery | Cemetery | 177 | Fayette | 39 11 00 N | 089 01 21 W |
| Stafford Bluff | Summit | 141 | Pope | 37 20 24 N | 088 41 44 W |
| Stafford Cemetery | Cemetery | 181 | Christian | 39 46 43 N | 089 11 45 W |
| Stafford Lake | Lake | 132 | Mason | 40 08 05 N | 090 14 40 W |
| Stafford School (historical) | School | 232 | Lake | 42 23 35 N | 087 56 34 W |
| Stafford-Crimmons Cemetery | Cemetery | 201 | Edgar | 39 40 35 N | 087 36 40 W |
| Stage Coach Trail Picnic Area | Locale | 160 | Marion | 38 43 17 N | 088 45 17 W |
| Stagecoach Hills | Populated Place | 248 | Winnebago | 42 25 15 N | 088 58 51 W |
| Stagecoach Junction | Populated Place | 189 | Montgomery | 39 13 07 N | 089 36 51 W |
| Stagg Elementary School | School | 183 | Cook | 41 45 33 N | 087 38 58 W |
| Stagg Field (historical) | Park | 180 | Cook | 41 47 33 N | 087 35 58 W |
| Stahl Cemetery | Cemetery | 224 | Adams | 40 00 55 N | 091 15 32 W |
| Stahlak Park | Park | 187 | Cook | 41 41 21 N | 087 46 50 W |
| Staley | Populated Place | 226 | Champaign | 40 06 47 N | 088 18 45 W |
| Staley Bridge | Bridge | 187 | Macon | 39 50 05 N | 088 54 42 W |
| Staley Cemetery | Cemetery | 195 | Sangamon | 39 40 33 N | 089 53 23 W |
| Staley Illini Grove | Woods | 227 | Champaign | 40 06 05 N | 088 13 12 W |
| Staley Library | Building | 195 | Macon | 39 50 33 N | 088 58 34 W |
| Staley School | School | 182 | Sangamon | 39 45 34 N | 089 38 04 W |
| Stallings | Populated Place | 127 | Madison | 38 43 29 N | 090 03 47 W |
| Stamm School | School | 179 | Grundy | 41 11 08 N | 088 20 21 W |
| Stan H Kaplan Education Center | School | 195 | Cook | 41 48 48 N | 087 52 09 W |
| Stan H Kaplan Education Center | School | 182 | Cook | 41 59 41 N | 087 40 14 W |
| Stanbery Lake | Reservoir | 150 | Fayette | 38 56 30 N | 089 02 18 W |
| Stanbery Lake Dam | Dam | 150 | Fayette | 38 56 30 N | 089 02 18 W |
| Standard | Populated Place | 207 | Putnam | 41 15 24 N | 089 10 51 W |
| Standard Cemetery | Cemetery | 198 | McDonough | 40 18 32 N | 090 34 38 W |
| Standard City | Populated Place | 195 | Macoupin | 39 21 08 N | 089 47 15 W |
| Standard City Lake | Reservoir | 190 | Macoupin | 39 20 18 N | 089 47 06 W |