Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Service Hill School (historical) | School | 168 | Jasper | 39 04 06 N | 088 12 30 W |
| Sesser | Populated Place | 146 | Franklin | 38 05 30 N | 089 03 01 W |
| Sesser Lake | Reservoir | 134 | Franklin | 38 04 06 N | 089 01 56 W |
| Sesser Oil Field | Oilfield | 143 | Franklin | 38 02 37 N | 089 03 54 W |
| Sesser Public Use Area | Park | 126 | Franklin | 38 05 47 N | 088 59 44 W |
| Sesser-Valier High School | School | 146 | Franklin | 38 05 22 N | 089 02 58 W |
| Seth B Atwood Park | Park | 218 | Winnebago | 42 11 03 N | 089 03 23 W |
| Seth Paine Elementary School | School | 254 | Lake | 42 12 46 N | 088 06 12 W |
| Seton Academy | School | 182 | Cook | 41 36 14 N | 087 35 06 W |
| Seton Catholic School | School | 213 | Rock Island | 41 29 47 N | 090 31 02 W |
| Seton Hall | Building | 182 | Cook | 41 55 34 N | 087 39 12 W |
| Setten Slough | Gut | 106 | Saline | 37 41 41 N | 088 27 06 W |
| Settlers Landing Mall Shopping Center | Locale | 204 | Kendall | 41 43 15 N | 088 19 02 W |
| Seven Gables Park | Park | 230 | DuPage | 41 50 25 N | 088 06 25 W |
| Seven Hickory School (historical) | School | 206 | Coles | 39 33 53 N | 088 13 59 W |
| Seven Holy Founders School | School | 184 | Cook | 41 40 01 N | 087 39 16 W |
| Seven Mile Baptist Church | Church | 118 | Massac | 37 10 06 N | 088 40 37 W |
| Seven Star Missionary Baptist Church | Church | 184 | Cook | 41 53 44 N | 087 43 16 W |
| Sevenmile Branch | Stream | | Lee | 41 54 00 N | 089 28 56 W |
| Sevenmile Church (historical) | Church | 121 | White | 38 06 55 N | 088 14 58 W |
| Sevenmile Creek | Stream | | Clark | 39 25 27 N | 087 48 38 W |
| Sevenmile Creek | Stream | | Jefferson | 38 17 25 N | 088 52 08 W |
| Sevenmile Creek | Stream | | Massac | 37 08 11 N | 088 40 40 W |
| Sevenmile Creek | Stream | | White | 38 09 26 N | 088 13 51 W |
| Seventeenth Church of Christ Scientist | Church | 182 | Cook | 41 53 11 N | 087 37 36 W |
| Seventeenth Street Park | Park | 185 | Rock Island | 41 30 33 N | 090 24 23 W |
| Seventh Adventist Church | Church | 248 | McLean | 40 28 52 N | 088 59 28 W |
| Seventh Avenue Elementary School | School | 198 | Cook | 41 48 04 N | 087 51 58 W |
| Seventh Church of Christ Scientist | Church | 182 | Cook | 41 58 44 N | 087 39 24 W |
| Seventh Day Adventist Cemetery | Cemetery | 155 | Edwards | 38 31 09 N | 088 00 12 W |
| Seventh Day Adventist Central Spanish Church | Church | 182 | Cook | 41 53 53 N | 087 40 45 W |
| Seventh Day Adventist Church | Church | 188 | Cook | 41 44 22 N | 087 47 26 W |
| Seventh Day Adventist Church | Church | 244 | Cook | 42 02 15 N | 088 14 51 W |
| Seventh Day Adventist Church | Church | 228 | DuPage | 41 47 11 N | 088 01 40 W |
| Seventh Day Adventist Church | Church | 207 | DuPage | 41 48 24 N | 087 55 11 W |
| Seventh Day Adventist Church | Church | 198 | Fulton | 40 32 38 N | 090 02 08 W |
| Seventh Day Adventist Church | Church | 164 | Jefferson | 38 18 56 N | 088 55 05 W |
| Seventh Day Adventist Church | Church | 185 | La Salle | 41 19 24 N | 088 50 19 W |
| Seventh Day Adventist Church | Church | 180 | La Salle | 41 31 46 N | 088 40 54 W |
| Seventh Day Adventist Church | Church | 199 | Lake | 42 22 40 N | 087 50 11 W |
| Seventh Day Adventist Church | Church | 151 | Marion | 38 31 54 N | 089 08 19 W |
| Seventh Day Adventist Church | Church | 167 | Menard | 40 00 24 N | 089 51 12 W |
| Seventh Day Adventist Church | Church | 207 | Peoria | 40 44 10 N | 089 35 38 W |
| Seventh Day Adventist Church | Church | 200 | Rock Island | 41 28 38 N | 090 27 54 W |
| Seventh Day Adventist Church | Church | 197 | Shelby | 39 15 51 N | 088 37 47 W |
| Seventh Day Adventist Church | Church | 196 | Whiteside | 41 46 46 N | 089 41 46 W |
| Seventh Day Adventist Church | Church | 223 | Will | 41 42 48 N | 088 03 38 W |
| Seventh Day Adventist Church | Church | 240 | Winnebago | 42 16 06 N | 089 01 42 W |
| Seventh Day Adventist Church - North Shore | Church | 186 | Cook | 41 58 35 N | 087 41 57 W |
| Seventh Day Adventist Church - Spanish North | Church | 182 | Cook | 41 57 48 N | 087 40 54 W |
| Seventh Day Adventist Church of Glen Ellyn | Church | 221 | DuPage | 41 53 47 N | 088 03 49 W |
| Seventh Day Adventist North Shore School | School | 186 | Cook | 41 58 35 N | 087 41 57 W |
| Seventh Day Adventist School | School | 207 | Peoria | 40 44 08 N | 089 35 38 W |
| Seventh Day Adventist School | School | 237 | Winnebago | 42 16 08 N | 089 01 42 W |
| Seventh Day Adventist South Spanish Church | Church | 182 | Cook | 41 49 56 N | 087 40 20 W |
| Seventh Day Church of God | Church | 209 | Montgomery | 39 10 35 N | 089 39 45 W |
| Seventh-Day Adventist School | School | 213 | Kane | 41 46 01 N | 088 21 19 W |
| Seventy-Ninth Street Church of Christ | Church | 181 | Cook | 41 45 02 N | 087 37 43 W |
| Severns School (historical) | School | 140 | Edwards | 38 25 20 N | 088 07 18 W |
| Severson Airport | Airport | 244 | Winnebago | 42 23 35 N | 089 07 50 W |
| Severson Dells Nature Preserve | Park | 240 | Winnebago | 42 12 22 N | 089 11 51 W |
| Severson Forest Preserve | Park | 219 | Kane | 41 57 19 N | 088 18 35 W |
| Severson-Dells Forest Preserve | Park | 243 | Winnebago | 42 12 35 N | 089 12 08 W |
| Seville | Populated Place | 155 | Fulton | 40 29 08 N | 090 20 37 W |
| Seville Bridge | Bridge | 140 | Fulton | 40 29 17 N | 090 21 08 W |
| Seville School (historical) | School | 174 | Fulton | 40 29 28 N | 090 21 03 W |
| Sewald School (historical) | School | 252 | McHenry | 42 14 14 N | 088 34 54 W |
| Seward | Populated Place | 273 | Winnebago | 42 14 20 N | 089 21 28 W |
| Seward Forest Preserve | Park | 244 | Winnebago | 42 16 51 N | 089 22 00 W |
| Seward Grade School | School | 271 | Winnebago | 42 14 20 N | 089 21 22 W |
| Seward Park | Park | 179 | Cook | 41 54 08 N | 087 38 17 W |
| Seward Park Field House | Building | 179 | Cook | 41 54 09 N | 087 38 17 W |
| Seward School | School | 182 | Cook | 41 48 35 N | 087 40 06 W |
| Sewell Lake (historical) | Lake | 134 | Tazewell | 40 27 56 N | 089 51 46 W |
| Sewer Creek | Stream | | Washington | 38 29 39 N | 089 12 32 W |
| Sewing Center Unlimited | School | 186 | Cook | 42 00 49 N | 087 41 32 W |
| Sexson Branch | Stream | | Shelby | 39 21 15 N | 088 33 43 W |
| Sexson Corner | Populated Place | 198 | Shelby | 39 23 22 N | 088 31 05 W |
| Sexton Creek | Stream | | Alexander | 37 14 31 N | 089 27 14 W |
| Sexton Elementary School | School | 181 | Cook | 41 47 07 N | 087 36 33 W |
| Seybert Family Cemetery | Cemetery | 158 | Madison | 38 50 28 N | 089 47 47 W |
| Seybert Hall | Building | 221 | DuPage | 41 46 40 N | 088 08 29 W |
| Seybold Cemetery | Cemetery | 227 | Pike | 39 47 40 N | 090 54 15 W |
| Seymore Branch | Stream | | Morgan | 39 33 40 N | 090 06 18 W |
| Seymour | Populated Place | 213 | Champaign | 40 06 25 N | 088 25 36 W |
| Seymour Bird Cemetery | Cemetery | 201 | Morgan | 39 34 56 N | 090 04 07 W |
| Seymour Elementary School | School | 226 | Adams | 39 49 06 N | 091 14 54 W |
| Seymour High School | School | 220 | Adams | 39 49 00 N | 091 15 01 W |
| Seymour Landing Strip | Airport | 216 | Henderson | 40 49 32 N | 090 53 51 W |
| Seymour Methodist Episcopal Cemetery | Cemetery | 217 | Champaign | 40 08 38 N | 088 27 24 W |
| Seymour Post Office | Post Office | 213 | Champaign | 40 06 27 N | 088 25 34 W |
| Seymour School (historical) | School | 146 | Lawrence | 38 44 21 N | 087 45 03 W |
| Seymour Simon Preserve | Park | 191 | Cook | 41 56 46 N | 087 50 44 W |
| Shaag Park | Park | 207 | Cook | 42 04 40 N | 087 58 22 W |
| Shabanee School | School | 206 | Cook | 42 08 04 N | 087 51 05 W |
| Shabbona | Populated Place | 274 | DeKalb | 41 46 05 N | 088 52 37 W |
| Shabbona County Park | Park | 203 | La Salle | 41 32 18 N | 088 50 52 W |
| Shabbona Elementary School | School | 273 | DeKalb | 41 45 59 N | 088 52 29 W |
| Shabbona Elementary School | School | 204 | Kankakee | 41 09 39 N | 087 52 35 W |
| Shabbona Grove | Populated Place | 254 | DeKalb | 41 43 57 N | 088 51 20 W |
| Shabbona Grove Picnic Area | Locale | 264 | DeKalb | 41 44 12 N | 088 51 49 W |
| Shabbona Lake | Reservoir | 257 | DeKalb | 41 44 22 N | 088 51 08 W |
| Shabbona Lake Dam | Dam | 257 | DeKalb | 41 44 22 N | 088 51 08 W |
| Shabbona Lake State Recreational Area | Park | 257 | DeKalb | 41 44 22 N | 088 51 08 W |
| Shabbona Middle School | School | 160 | Grundy | 41 22 11 N | 088 26 03 W |
| Shabbona Park | Park | 195 | Cook | 41 56 33 N | 087 48 02 W |
| Shabbona Park | Park | 218 | Will | 41 28 08 N | 087 41 22 W |
| Shabbona School (historical) | School | 167 | La Salle | 41 20 06 N | 088 50 20 W |
| Shabbona Special Ditch | Canal | 188 | Henry | 41 25 01 N | 089 57 15 W |
| Shabonne Park | Park | 190 | Cook | 42 03 34 N | 087 43 50 W |