Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Rollinson School (historical) | School | 134 | Franklin | 38 01 28 N | 088 53 42 W |
| Rollo | Populated Place | 228 | DeKalb | 41 40 23 N | 088 53 10 W |
| Rollo Congregational Church | Church | 229 | DeKalb | 41 40 20 N | 088 53 13 W |
| Rolls Ford | Crossing | 150 | Sangamon | 39 51 04 N | 089 43 56 W |
| Roma Driving School | School | 198 | Cook | 41 55 27 N | 087 48 19 W |
| Roma School of Beauty Culture | School | 184 | Cook | 41 47 18 N | 087 42 11 W |
| Romanian Baptist Church | Church | 187 | Cook | 41 57 13 N | 087 45 13 W |
| Romanian Eastern Orthodox Church of Saint Mary | Church | 188 | Cook | 41 57 26 N | 087 46 01 W |
| Rombury Oaks | Populated Place | 244 | Kane | 41 52 29 N | 088 28 04 W |
| Rome | Populated Place | 141 | Peoria | 40 52 59 N | 089 30 09 W |
| Rome Community Consolidated Elementary School | School | 172 | Jefferson | 38 26 22 N | 088 56 25 W |
| Romeo | Populated Place | 179 | Will | 41 38 26 N | 088 03 30 W |
| Romeoville | Populated Place | 188 | Will | 41 38 51 N | 088 05 22 W |
| Romeoville Branch Fountaindale Public Library | Building | 194 | Will | 41 39 15 N | 088 05 09 W |
| Romeoville High School | School | 187 | Will | 41 37 39 N | 088 04 57 W |
| Romeoville Post Office | Post Office | 195 | Will | 41 38 22 N | 088 05 15 W |
| Romeoville Prairie County Forest Preserve | Park | 182 | Cook | 41 39 35 N | 088 02 15 W |
| Romeoville Prairie Nature Preserve | Park | 179 | Will | 41 38 50 N | 088 04 12 W |
| Romine Church | Church | 167 | Marion | 38 31 13 N | 088 56 28 W |
| Romine Church of the Brethren | Church | 166 | Marion | 38 35 29 N | 088 53 23 W |
| Romine Prairie Cemetery | Cemetery | 167 | Marion | 38 31 12 N | 088 56 45 W |
| Romine School (historical) | School | 166 | Marion | 38 31 12 N | 088 56 28 W |
| Romine Townhall | Building | 150 | Marion | 38 31 21 N | 088 45 01 W |
| Romona Elementary School | School | 190 | Cook | 42 04 26 N | 087 44 46 W |
| Romper Room Day Care and Kindergarten | School | 183 | Cook | 41 46 45 N | 087 40 02 W |
| Ron Beese Park | Park | 261 | Cook | 42 08 08 N | 088 07 25 W |
| Ron Centanni Park | Park | 212 | Cook | 41 34 36 N | 087 49 22 W |
| Ron Lake | Reservoir | 146 | Madison | 38 41 35 N | 089 39 26 W |
| Ronald K Dornink Airport | Airport | 287 | Stephenson | 42 22 40 N | 089 33 50 W |
| Ronald McDonald Childrens Hospital of Loyola University Medical Center | Hospital | 190 | Cook | 41 51 38 N | 087 50 06 W |
| Ronald McDonald House | Building | 181 | Cook | 41 47 25 N | 087 36 15 W |
| Ronald W Reagan Middle School | School | 229 | Lee | 41 49 55 N | 089 28 24 W |
| Roncalli High School | School | 216 | Kane | 41 45 49 N | 088 16 50 W |
| Rondout | Populated Place | 206 | Lake | 42 16 48 N | 087 53 43 W |
| Rondout School | School | 208 | Lake | 42 16 40 N | 087 54 18 W |
| Roney Lake | Reservoir | 209 | Warren | 41 00 36 N | 090 38 18 W |
| Roney Lake Dam | Dam | 209 | Warren | 41 00 36 N | 090 38 18 W |
| Roney School (historical) | School | 144 | Richland | 38 48 20 N | 087 55 39 W |
| Ronnetree Park | Park | 184 | Cook | 41 39 36 N | 087 43 42 W |
| Roodhouse | Populated Place | 200 | Greene | 39 29 02 N | 090 22 17 W |
| Roodhouse Christian Church | Church | 198 | Greene | 39 28 55 N | 090 22 18 W |
| Roodhouse Elementary School | School | 198 | Greene | 39 29 12 N | 090 22 32 W |
| Roodhouse Lake | Reservoir | 180 | Greene | 39 27 42 N | 090 21 54 W |
| Roodhouse Lake Dam | Dam | 180 | Greene | 39 27 42 N | 090 21 54 W |
| Roodhouse Post Office | Post Office | 199 | Greene | 39 28 58 N | 090 22 21 W |
| Roods Creek | Stream | | La Salle | 41 32 37 N | 088 39 59 W |
| Rook's Creek Cemetery | Cemetery | 197 | Livingston | 40 52 23 N | 088 43 17 W |
| Rooks Creek | Populated Place | 198 | Livingston | 40 52 50 N | 088 42 01 W |
| Rooks Creek | Stream | | Livingston | 40 52 55 N | 088 39 15 W |
| Rooks Creek | Stream | | Livingston | 40 57 45 N | 088 44 16 W |
| Rooks Creek School (historical) | School | 197 | Livingston | 40 52 25 N | 088 43 17 W |
| Rooks Creek United Methodist Church | Church | 196 | Livingston | 40 52 24 N | 088 43 18 W |
| Roos Ditch | Canal | 149 | Mason | 40 22 23 N | 089 47 00 W |
| Roosevelt Center | Building | 183 | Cook | 41 36 09 N | 087 36 28 W |
| Roosevelt Elementary School | School | 196 | Clark | 39 18 01 N | 087 59 17 W |
| Roosevelt Elementary School | School | 202 | Cook | 41 30 24 N | 087 39 06 W |
| Roosevelt Elementary School | School | 191 | Cook | 41 52 07 N | 087 51 02 W |
| Roosevelt Elementary School | School | 187 | La Salle | 41 19 46 N | 089 08 08 W |
| Roosevelt Elementary School | School | 215 | Rock Island | 41 29 26 N | 090 29 06 W |
| Roosevelt High School | School | 182 | Cook | 41 57 54 N | 087 42 53 W |
| Roosevelt Junior High School | School | 193 | Cook | 41 53 10 N | 087 51 51 W |
| Roosevelt Junior High School | School | 155 | Peoria | 40 41 16 N | 089 37 08 W |
| Roosevelt Memorial Hospital | Hospital | 182 | Cook | 41 55 00 N | 087 38 23 W |
| Roosevelt Middle School | School | 207 | Macon | 39 51 16 N | 088 57 56 W |
| Roosevelt Middle School | School | 235 | Winnebago | 42 16 59 N | 089 05 35 W |
| Roosevelt Military Academy | School | 221 | Mercer | 41 12 32 N | 090 45 12 W |
| Roosevelt Park | Park | 214 | Cook | 41 59 49 N | 088 00 28 W |
| Roosevelt Park | Park | 180 | Cook | 41 52 05 N | 087 37 48 W |
| Roosevelt Park | Park | 189 | Cook | 41 52 06 N | 087 48 16 W |
| Roosevelt Park | Park | 196 | Cook | 42 04 31 N | 087 48 50 W |
| Roosevelt Park | Park | 184 | Lake | 42 21 08 N | 087 50 15 W |
| Roosevelt School | School | 184 | Cook | 41 51 36 N | 087 44 59 W |
| Roosevelt School | School | 196 | Cook | 41 59 56 N | 087 50 03 W |
| Roosevelt School | School | 182 | Cook | 41 37 43 N | 087 37 32 W |
| Roosevelt School | School | 156 | St. Clair | 38 30 17 N | 089 59 38 W |
| Roosevelt School | School | 146 | Tazewell | 40 33 19 N | 089 39 28 W |
| Roosevelt School (historical) | School | 183 | Cook | 41 36 09 N | 087 36 28 W |
| Roosevelt School (historical) | School | 212 | DuPage | 41 54 32 N | 087 56 54 W |
| Roosevelt University | School | 212 | Cook | 42 02 46 N | 087 58 23 W |
| Roosevelt University | School | 180 | Cook | 41 52 33 N | 087 37 28 W |
| Root Cemetery | Cemetery | 166 | Brown | 39 52 16 N | 090 37 45 W |
| Root Cemetery Savanna Nature Preserve | Park | | Peoria | 40 55 49 N | 089 31 30 W |
| Root Lick Branch | Stream | | Pope | 37 21 23 N | 088 38 03 W |
| Root School (historical) | School | 180 | Montgomery | 39 02 33 N | 089 34 01 W |
| Roots | Populated Place | 117 | Randolph | 38 01 04 N | 089 58 20 W |
| Roots School (historical) | School | 149 | Perry | 38 06 19 N | 089 14 32 W |
| Roper Cemetery | Cemetery | 150 | Pope | 37 19 03 N | 088 31 52 W |
| Ropers Landing | Locale | 103 | Pope | 37 18 14 N | 088 30 32 W |
| Ropp Agriculture Building | Building | 244 | McLean | 40 30 48 N | 088 59 43 W |
| Ropp Airpark | Airport | 177 | Henry | 41 34 31 N | 090 09 35 W |
| Ropp Cemetery | Cemetery | 245 | McLean | 40 35 29 N | 089 02 51 W |
| Roque De Duprey Elementary School | School | 183 | Cook | 41 54 25 N | 087 41 40 W |
| Rosamond | Populated Place | 216 | Christian | 39 22 47 N | 089 09 37 W |
| Rosamond Grove Cemetery | Cemetery | 242 | Christian | 39 21 58 N | 089 09 08 W |
| Rosamond Post Office | Post Office | 215 | Christian | 39 22 49 N | 089 09 44 W |
| Rosary High School | School | 210 | Kane | 41 46 28 N | 088 21 29 W |
| Roscoe | Populated Place | 225 | Winnebago | 42 24 48 N | 089 00 33 W |
| Roscoe Cemetery | Cemetery | 232 | Winnebago | 42 25 01 N | 089 00 03 W |
| Roscoe Quarry | Mine | 245 | Winnebago | 42 23 18 N | 088 58 59 W |
| Roscoe Siding (historical) | Locale | 226 | Winnebago | 42 24 44 N | 089 02 43 W |
| Rose Cemetery | Cemetery | 213 | De Witt | 40 07 13 N | 088 52 43 W |
| Rose Cemetery | Cemetery | 116 | Franklin | 37 54 00 N | 089 00 18 W |
| Rose Cemetery | Cemetery | 148 | Hardin | 37 30 58 N | 088 24 28 W |
| Rose Cemetery | Cemetery | 153 | Hardin | 37 30 59 N | 088 24 12 W |
| Rose Cemetery | Cemetery | 159 | Hardin | 37 31 27 N | 088 21 45 W |
| Rose Cemetery | Cemetery | 200 | Shelby | 39 29 32 N | 088 43 57 W |
| Rose Cemetery | Cemetery | 200 | Vermilion | 40 15 19 N | 087 35 52 W |
| Rose Center School (historical) | School | 182 | Shelby | 39 23 30 N | 088 51 47 W |
| Rose Creek | Stream | | Hardin | 37 33 44 N | 088 24 53 W |
| Rose Creek | Stream | | Saline | 37 39 09 N | 088 23 23 W |