Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sauganash | Populated Place | 186 | Cook | 41 59 24 N | 087 44 32 W |
| Sauganash Community Church | Church | 185 | Cook | 41 59 22 N | 087 44 33 W |
| Sauganash Community Church Annex | Building | 185 | Cook | 41 59 24 N | 087 44 37 W |
| Sauganash Park | Park | 185 | Cook | 41 59 19 N | 087 44 14 W |
| Sauganash Reserve | Park | 188 | Cook | 41 59 33 N | 087 46 00 W |
| Sauganash School | School | 186 | Cook | 41 59 30 N | 087 44 47 W |
| Sauget | Populated Place | 125 | St. Clair | 38 35 47 N | 090 11 05 W |
| Sauk Area Career Center | School | 185 | Cook | 41 38 34 N | 087 43 01 W |
| Sauk Elementary School | School | 220 | Cook | 41 29 07 N | 087 43 28 W |
| Sauk Plaza Shopping Center | Locale | 195 | Cook | 41 29 28 N | 087 33 23 W |
| Sauk Trail Baptist Temple | Church | 219 | Cook | 41 28 59 N | 087 43 23 W |
| Sauk Trail County Forest Preserve | Woods | 205 | Cook | 41 30 07 N | 087 38 38 W |
| Sauk Trail Dam | Dam | 223 | Will | 41 29 18 N | 087 47 48 W |
| Sauk Trail Forest Preserve | Park | 222 | Will | 41 29 07 N | 087 48 00 W |
| Sauk Trail Forest Preserve | Woods | 216 | Cook | 41 28 39 N | 087 39 52 W |
| Sauk Trail Lake | Reservoir | 205 | Cook | 41 29 28 N | 087 39 17 W |
| Sauk Trail Lake Dam | Dam | 205 | Cook | 41 29 28 N | 087 39 17 W |
| Sauk Trail Pond | Reservoir | 223 | Henry | 41 19 34 N | 089 53 53 W |
| Sauk Trail School | School | 218 | Cook | 41 28 39 N | 087 40 59 W |
| Sauk Trail School | School | 204 | Cook | 41 29 07 N | 087 36 22 W |
| Sauk Valley Community College | School | 201 | Lee | 41 49 03 N | 089 35 52 W |
| Sauk Village | Populated Place | 199 | Cook | 41 29 18 N | 087 34 03 W |
| Sauk Village Baptist Church | Church | 198 | Cook | 41 29 03 N | 087 34 10 W |
| Sauk Village Village Hall | Building | 195 | Cook | 41 29 42 N | 087 33 27 W |
| Saukie Golf Course | Locale | 203 | Rock Island | 41 28 36 N | 090 32 37 W |
| Saukview School | School | 217 | Cook | 41 28 40 N | 087 38 23 W |
| Saul School (historical) | School | 139 | Franklin | 37 54 19 N | 088 43 31 W |
| Saunders | Populated Place | 184 | Sangamon | 39 51 07 N | 089 18 26 W |
| Saunders Cemetery | Cemetery | 200 | Fulton | 40 29 28 N | 090 07 32 W |
| Saunders Family Cemetery | Cemetery | 141 | White | 38 05 23 N | 088 12 42 W |
| Saunders Hall | Building | 229 | Champaign | 40 05 59 N | 088 13 10 W |
| Saunders Hospital | Hospital | 195 | Morgan | 40 39 53 N | 090 26 43 W |
| Saunders Hospital Heliport | Airport | 196 | Warren | 40 40 50 N | 090 26 50 W |
| Saunders Lake (historical) | Lake | 122 | Monroe | 38 25 36 N | 090 16 06 W |
| Saunders School (historical) | School | 252 | Winnebago | 42 18 41 N | 089 18 04 W |
| Saunemin | Populated Place | 210 | Livingston | 40 53 35 N | 088 24 19 W |
| Saunemin Christian Church (historical) | Church | 211 | Livingston | 40 53 33 N | 088 24 07 W |
| Saunemin Elementary School | School | 207 | Livingston | 40 53 30 N | 088 24 32 W |
| Saunemin Five Mile Cemetery | Cemetery | 201 | Livingston | 40 51 18 N | 088 25 51 W |
| Saunemin High School (historical) | School | 206 | Livingston | 40 53 26 N | 088 24 35 W |
| Saunemin United Methodist Church | Church | 213 | Livingston | 40 53 37 N | 088 24 10 W |
| Saunnak Forest Preserve | Park | 199 | DeKalb | 41 38 13 N | 088 39 15 W |
| Savage (historical) | Populated Place | 183 | Morgan | 39 46 53 N | 090 12 39 W |
| Savage Lake | Lake | 126 | Clinton | 38 31 36 N | 089 22 53 W |
| Savanna | Populated Place | 183 | Carroll | 42 05 40 N | 090 09 24 W |
| Savanna Army Depot (historical) | Military (Historical) | 199 | Jo Daviess | 42 12 33 N | 090 18 50 W |
| Savanna Bay | Bay | 178 | Carroll | 42 07 09 N | 090 09 30 W |
| Savanna Cemetery | Cemetery | 189 | Carroll | 42 04 45 N | 090 07 47 W |
| Savanna City Hospital Heliport | Airport | 242 | Carroll | 42 06 06 N | 090 09 16 W |
| Savanna High School | School | 194 | Carroll | 42 05 48 N | 090 08 04 W |
| Savanna Islands | Island | 178 | Carroll | 42 03 26 N | 090 09 44 W |
| Savanna Slough | Stream | | Carroll | 42 03 28 N | 090 09 26 W |
| Savanna Township Public Library | Building | 186 | Carroll | 42 05 39 N | 090 09 19 W |
| Savanna-Sabula Bridge | Bridge | 178 | Carroll | 42 06 15 N | 090 09 40 W |
| Saverton Island | Island | 141 | Pike | 39 39 17 N | 091 15 40 W |
| Savoy | Populated Place | 224 | Champaign | 40 03 17 N | 088 15 06 W |
| Saw Wee Kee Park | Park | 183 | Kendall | 41 39 50 N | 088 24 07 W |
| Sawmill Creek | Stream | | DuPage | 41 41 44 N | 087 57 37 W |
| Sawmill Lake | Lake | 112 | Monroe | 38 15 39 N | 089 55 18 W |
| Sawmill Lake | Lake | 134 | Putnam | 41 07 24 N | 089 19 28 W |
| Sawyer Cemetery | Cemetery | 200 | Marshall | 41 04 00 N | 089 18 12 W |
| Sawyer Elementary School | School | 183 | Cook | 41 47 51 N | 087 42 18 W |
| Sawyer Playground | Park | 231 | Winnebago | 42 13 35 N | 089 03 45 W |
| Sawyer School (historical) | School | 266 | DeKalb | 41 56 59 N | 088 41 17 W |
| Sawyer School (historical) | School | 200 | Putnam | 41 04 20 N | 089 18 23 W |
| Sawyer Secretarial School | School | 182 | Cook | 41 53 08 N | 087 37 34 W |
| Sawyer Secretarial School | School | 190 | Cook | 41 52 56 N | 087 48 15 W |
| Sawyer Slough | Lake | 134 | Marshall | 40 59 36 N | 089 25 30 W |
| Sawyerville | Populated Place | 192 | Macoupin | 39 04 42 N | 089 48 26 W |
| Sawyerville Public School (historical) | School | 192 | Macoupin | 39 04 52 N | 089 48 24 W |
| Saxe Bridge (historical) | Bridge | 113 | Wayne | 38 17 56 N | 088 10 31 W |
| Saxon (historical) | Populated Place | 229 | Henry | 41 09 08 N | 089 53 31 W |
| Saxon (historical) | Populated Place | 212 | Livingston | 40 54 54 N | 088 15 05 W |
| Saxon Cemetery | Cemetery | 229 | Henry | 41 09 13 N | 089 53 14 W |
| Saxon School (historical) | School | 225 | Henry | 41 09 10 N | 089 53 29 W |
| Saxtown Cemetery | Cemetery | 167 | St. Clair | 38 23 24 N | 090 05 27 W |
| Saxtown School (historical) | School | 173 | St. Clair | 38 24 14 N | 090 04 25 W |
| Saybrook | Populated Place | 244 | McLean | 40 25 36 N | 088 31 34 W |
| Saylor School (historical) | School | 189 | Peoria | 40 36 59 N | 089 47 39 W |
| Sayre Language Academy | School | 192 | Cook | 41 54 50 N | 087 47 58 W |
| Sayre Park | Park | 198 | Cook | 41 55 17 N | 087 47 59 W |
| Sayre Station | Locale | 198 | Cook | 41 55 18 N | 087 48 04 W |
| Scab Hollow | Valley | | Schuyler | 40 09 17 N | 090 26 34 W |
| Scales Mound | Populated Place | 292 | Jo Daviess | 42 28 33 N | 090 15 10 W |
| Scales Mound | Summit | 356 | Jo Daviess | 42 28 02 N | 090 16 17 W |
| Scales Mound High School | School | 286 | Jo Daviess | 42 28 29 N | 090 15 03 W |
| Scales Mound Historic District | Park | 291 | Jo Daviess | 42 28 42 N | 090 15 04 W |
| Scales School (historical) | School | 206 | Douglas | 39 42 38 N | 088 19 14 W |
| Scaly Point School (historical) | School | 189 | Mercer | 41 05 26 N | 090 45 48 W |
| Scammon Elementary School | School | 184 | Cook | 41 56 29 N | 087 43 58 W |
| Scandinavian Cemetery | Cemetery | 271 | McHenry | 42 21 35 N | 088 26 49 W |
| Scandinavian Cemetery | Cemetery | 245 | Winnebago | 42 16 43 N | 089 03 54 W |
| Scanlan School | School | 180 | Cook | 41 39 15 N | 087 36 54 W |
| Scanlan School | School | 185 | Cook | 41 40 50 N | 087 37 29 W |
| Scanlin Spur | Locale | 111 | Johnson | 37 21 59 N | 088 56 48 W |
| Scarboro | Populated Place | 248 | Lee | 41 46 53 N | 089 02 03 W |
| Scarlet Oak Elementary School | School | 204 | Cook | 41 36 28 N | 087 45 37 W |
| Scattering Fork | Stream | | Douglas | 39 44 54 N | 088 10 15 W |
| Scattering Grove (historical) | Woods | 204 | Clark | 39 23 39 N | 087 58 02 W |
| Scattering Point Creek | Stream | | Livingston | 40 59 18 N | 088 46 58 W |
| Scattering Point School (historical) | School | 191 | Livingston | 40 57 10 N | 088 46 51 W |
| Scenic Hill Cemetery | Cemetery | 236 | Jersey | 38 59 21 N | 090 25 06 W |
| Schaaf Hollow | Valley | | Jersey | 39 04 33 N | 090 29 24 W |
| Schadt Park | Park | 206 | Rock Island | 41 30 30 N | 090 24 50 W |
| Schaefer Cemetery | Cemetery | 148 | St. Clair | 38 26 38 N | 089 53 12 W |
| Schaefer Family Cemetery | Cemetery | 210 | Rock Island | 41 35 00 N | 090 17 37 W |
| Schaefer Junior High School | School | 167 | St. Clair | 38 35 17 N | 089 54 46 W |
| Schaefer Park | Park | 180 | Cook | 41 55 32 N | 087 40 09 W |
| Schaeferville | Populated Place | 163 | Tazewell | 40 32 52 N | 089 37 52 W |
| Schaeffer Hill | Summit | 161 | Clinton | 38 35 56 N | 089 20 35 W |