Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Southport | Populated Place | 196 | Peoria | 40 47 33 N | 089 53 55 W |
| Southport Cemetery | Cemetery | 209 | Peoria | 40 47 26 N | 089 52 40 W |
| Southside Athletic Park | Park | 187 | La Salle | 41 06 41 N | 088 49 07 W |
| Southside Church of Christ | Church | 216 | Coles | 39 28 19 N | 088 22 29 W |
| Southside Church of Christ | Church | 167 | Peoria | 40 40 30 N | 089 39 02 W |
| Southside Church of God | Church | 225 | Winnebago | 42 15 17 N | 089 06 15 W |
| Southside Institute | School | 186 | Cook | 41 42 17 N | 087 38 35 W |
| Southside Language Center | School | 185 | Cook | 41 45 34 N | 087 40 35 W |
| Southside School | School | 183 | Cook | 41 42 43 N | 087 45 16 W |
| Southside School | School | 245 | Stephenson | 42 16 51 N | 089 36 05 W |
| Southside School | School | 201 | Whiteside | 41 48 21 N | 089 57 58 W |
| Southside School (historical) | School | 158 | Marion | 38 36 05 N | 088 57 00 W |
| Southside School (historical) | School | 120 | Pulaski | 37 11 25 N | 089 08 31 W |
| Southside Tabernacle | Church | 183 | Cook | 41 45 11 N | 087 39 15 W |
| Southside Unity Center of Christianity | Church | 189 | Cook | 41 43 27 N | 087 39 47 W |
| Southtown Day Care Center | School | 182 | Cook | 41 46 08 N | 087 39 08 W |
| Southwest Chicago Christian School | School | 215 | Cook | 41 34 42 N | 087 49 18 W |
| Southwest Chicago Christian School | School | 182 | Cook | 41 42 30 N | 087 45 38 W |
| Southwest Church | Church | 187 | Cook | 41 41 29 N | 087 46 42 W |
| Southwest Cooperative Pre-School | School | 185 | Cook | 41 46 45 N | 087 42 38 W |
| Southwest Driving School | School | 189 | Cook | 41 43 58 N | 087 44 30 W |
| Southwest Elementary School | School | 189 | Cook | 41 42 46 N | 087 42 42 W |
| Southwest Elementary School | School | 193 | Henry | 41 26 40 N | 090 09 33 W |
| Southwest Park | Park | 185 | Cook | 41 35 53 N | 087 39 30 W |
| Southwest Park | Park | 139 | Wayne | 38 22 24 N | 088 22 27 W |
| Southwest Plaza Shopping Center | Locale | 183 | Sangamon | 39 45 45 N | 089 42 30 W |
| Southwest Plaza Shopping Center | Locale | 254 | Stephenson | 42 16 46 N | 089 37 49 W |
| Southwest School of Business | School | 189 | Cook | 41 44 48 N | 087 42 09 W |
| Southwestern Community Club Lake | Reservoir | 144 | Randolph | 38 00 42 N | 089 36 00 W |
| Southwestern Community Club Lake Dam | Dam | 144 | Randolph | 38 00 42 N | 089 36 00 W |
| Southwestern High School | School | 188 | Macoupin | 39 07 08 N | 090 08 24 W |
| Southwood Park | Park | 211 | Tazewell | 40 35 49 N | 089 26 45 W |
| Southwood School | School | 219 | Cook | 41 32 58 N | 087 43 43 W |
| Sovereign Grace Baptist Church | Church | 186 | Rock Island | 41 31 56 N | 090 25 23 W |
| Sovereign Grace Baptist Church | Church | 260 | Winnebago | 42 15 32 N | 089 01 01 W |
| Soverhill School (historical) | School | 207 | Bureau | 41 16 20 N | 089 31 23 W |
| Sow Creek | Stream | | Pulaski | 37 11 01 N | 089 12 35 W |
| Soward Cemetery | Cemetery | 110 | Hardin | 37 26 56 N | 088 23 42 W |
| Sowers Elementary School | School | 227 | Woodford | 40 48 06 N | 089 11 53 W |
| Space K Resort | Locale | 225 | Lake | 42 13 51 N | 088 10 39 W |
| Spade Slough | Gut | 177 | Henry | 41 33 59 N | 090 09 20 W |
| Spafford Creek | Stream | | Jo Daviess | 42 34 29 N | 089 53 23 W |
| Spain Cemetery | Cemetery | 189 | Shelby | 39 17 29 N | 088 33 21 W |
| Spaits School (historical) | School | 154 | Mason | 40 21 43 N | 089 46 16 W |
| Spalding High School (historical) | School | 182 | Cook | 41 53 01 N | 087 40 04 W |
| Spalding Institute | School | 156 | Peoria | 40 41 47 N | 089 35 17 W |
| Spalding Park | Park | 228 | Champaign | 40 07 21 N | 088 15 05 W |
| Spalding School | School | 220 | DuPage | 41 53 48 N | 088 03 39 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 |
| Spangler Airport | Airport | 205 | Kankakee | 41 14 18 N | 087 51 34 W |
| Spangler Cemetery | Cemetery | 191 | Hancock | 40 26 52 N | 090 59 16 W |
| Spangler Cemetery | Cemetery | 198 | Macon | 39 51 03 N | 088 53 54 W |
| Spangler School (historical) | School | 196 | Will | 41 37 28 N | 088 07 23 W |
| Spanish American Commercial School | School | 181 | Cook | 41 54 36 N | 087 40 38 W |
| Spanish Church of God | Church | 202 | Whiteside | 41 47 23 N | 089 42 32 W |
| Spanish Missionary Baptist Church | Church | 181 | Cook | 41 51 22 N | 087 39 35 W |
| Spanish Needle Community Center | Locale | 192 | Macoupin | 39 11 40 N | 089 53 45 W |
| Spanish Needle Creek | Stream | | Macoupin | 39 13 56 N | 089 54 33 W |
| Spanish Needle School (historical) | School | 192 | Macoupin | 39 11 50 N | 089 53 39 W |
| Spanish Pentecostal Church | Church | 196 | Lake | 42 21 14 N | 087 49 54 W |
| Spanker Branch | Stream | | Madison | 38 39 32 N | 089 37 29 W |
| Spankey | Populated Place | 129 | Jersey | 39 11 20 N | 090 33 02 W |
| Spankey Hill | Summit | 207 | Greene | 39 11 36 N | 090 32 52 W |
| Spar Island | Island | 129 | Greene | 39 24 28 N | 090 36 55 W |
| Sparks Hill | Populated Place | 186 | Hardin | 37 35 05 N | 088 17 13 W |
| Sparks Hill Post Office (historical) | Post Office | 186 | Hardin | 37 35 04 N | 088 17 14 W |
| Sparks Post Office (historical) | Post Office | 141 | Clinton | 38 41 10 N | 089 26 48 W |
| Sparland | Populated Place | 144 | Marshall | 41 01 43 N | 089 26 18 W |
| Sparland State Conservation Area | Park | 135 | Marshall | 41 03 30 N | 089 25 30 W |
| Sparrow Cemetery | Cemetery | 189 | Tazewell | 40 25 58 N | 089 26 13 W |
| Sparrow Creek | Stream | | St. Clair | 38 30 47 N | 090 08 33 W |
| Sparrow Park | Park | 234 | Cook | 42 05 55 N | 088 04 03 W |
| Sparrow Ridge Park | Park | 255 | Lake | 42 10 42 N | 088 04 40 W |
| Sparta | Populated Place | 161 | Randolph | 38 07 23 N | 089 42 06 W |
| Sparta Community Airport | Airport | 161 | Randolph | 38 08 56 N | 089 41 55 W |
| Sparta Community Hospital | Hospital | 155 | Randolph | 38 07 27 N | 089 41 29 W |
| Sparta Country Club | Locale | 153 | Randolph | 38 07 00 N | 089 43 23 W |
| Sparta Election Precinct | Civil | 149 | Randolph | 38 06 40 N | 089 40 30 W |
| Sparta High School | School | 168 | Randolph | 38 07 57 N | 089 42 21 W |
| Sparta Historic District | Park | 162 | Randolph | 38 07 13 N | 089 42 16 W |
| Sparta Post Office | Post Office | 163 | Randolph | 38 07 20 N | 089 42 16 W |
| Sparta Primary Attendance Center | School | 166 | Randolph | 38 08 06 N | 089 42 17 W |
| Sparta Public Library | Building | 168 | Randolph | 38 07 25 N | 089 42 13 W |
| Sparta Reformed Presbyterian Church | Church | 162 | Randolph | 38 07 40 N | 089 42 07 W |
| Sparta-Lincoln Attendence Center | School | 163 | Randolph | 38 07 31 N | 089 42 15 W |
| Spartan Meadows Golf Course | Locale | 246 | Kane | 42 00 55 N | 088 19 24 W |
| Spath Spur | Stream | | Henry | 41 27 37 N | 089 56 02 W |
| Spatterdock Lake | Lake | 136 | Pike | 39 30 16 N | 090 59 24 W |
| Spaulding | Populated Place | 235 | Cook | 42 00 10 N | 088 14 07 W |
| Spaulding | Populated Place | 177 | Sangamon | 39 51 58 N | 089 32 25 W |
| Spaulding Corners | Populated Place | 220 | Lake | 42 22 14 N | 087 52 52 W |
| Spaulding Dam | Dam | 170 | Sangamon | 39 45 34 N | 089 36 01 W |
| Spaulding Elementary School | School | 222 | Lake | 42 23 19 N | 087 53 29 W |
| Spaulding School (historical) | School | 196 | Will | 41 39 57 N | 088 11 54 W |
| Speaks Cemetery | Cemetery | 154 | Clay | 38 46 41 N | 088 33 59 W |
| Spear Cemetery | Cemetery | 132 | Calhoun | 39 22 11 N | 090 37 54 W |
| Spears Woods | Woods | 224 | Cook | 41 43 32 N | 087 51 10 W |
| Specht School (historical) | School | 187 | Henry | 41 34 22 N | 089 58 28 W |
| Special Education United Township School | School | 208 | Rock Island | 41 29 59 N | 090 26 22 W |
| Special Religious Education | School | 182 | Cook | 41 50 25 N | 087 38 34 W |
| Specie Grove | Woods | 217 | Kendall | 41 37 24 N | 088 23 26 W |
| Speckman Cemetery | Cemetery | 146 | Mason | 40 15 51 N | 090 04 53 W |
| Spectrum School | School | 224 | Winnebago | 42 18 20 N | 089 04 37 W |
| Speedwell School (historical) | School | 195 | Fulton | 40 40 11 N | 090 14 02 W |
| Speer | Populated Place | 226 | Stark | 40 59 18 N | 089 39 01 W |
| Speer Post Office | Post Office | 228 | Stark | 40 59 12 N | 089 39 06 W |
| Spees Landing | Locale | 99 | Hardin | 37 28 04 N | 088 09 16 W |
| Spence Cemetery | Cemetery | 223 | Livingston | 40 40 20 N | 088 31 34 W |
| Spence Landing Strip | Airport | 219 | Piatt | 40 14 34 N | 088 36 28 W |