Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Red Bud Picnic Area | Locale | 159 | Jasper | 39 01 12 N | 088 07 25 W |
| Red Bud School (historical) | School | 235 | Union | 37 34 14 N | 089 02 50 W |
| Red Covered Bridge | Bridge | 188 | Bureau | 41 24 59 N | 089 28 42 W |
| Red Fox Run Picnic Area | Locale | 204 | Peoria | 40 49 20 N | 089 48 08 W |
| Red Gate Woods | Woods | 196 | Cook | 41 42 36 N | 087 54 37 W |
| Red Hill | Summit | 193 | Lawrence | 38 44 32 N | 087 50 08 W |
| Red Hill High School | School | 140 | Lawrence | 38 42 44 N | 087 45 29 W |
| Red Hills Chapel | Church | 193 | Lawrence | 38 44 32 N | 087 50 08 W |
| Red Hills Lake | Reservoir | 152 | Lawrence | 38 43 38 N | 087 50 12 W |
| Red Hills State Park | Park | 158 | Lawrence | 38 43 47 N | 087 50 08 W |
| Red Hills State Park Lake | Reservoir | 152 | Lawrence | 38 43 42 N | 087 50 18 W |
| Red Hills State Park Lake Dam | Dam | 152 | Lawrence | 38 43 42 N | 087 50 18 W |
| Red Hills Woods Nature Preserve | Park | 167 | Lawrence | 38 43 21 N | 087 49 52 W |
| Red Landing | Locale | 133 | Calhoun | 39 10 07 N | 090 42 26 W |
| Red Lick School (historical) | School | 166 | Marion | 38 39 50 N | 088 49 05 W |
| Red Mill School (historical) | School | 152 | Bureau | 41 16 34 N | 089 23 14 W |
| Red Mine | Mine | 138 | Pope | 37 31 36 N | 088 25 26 W |
| Red Oak | Populated Place | 241 | Stephenson | 42 23 32 N | 089 40 18 W |
| Red Oak Backpack Trail | Trail | 213 | Brown | 39 52 50 N | 090 55 00 W |
| Red Oak Cemetery | Cemetery | 235 | Bureau | 41 34 18 N | 089 32 13 W |
| Red Oak Cemetery | Cemetery | 247 | Henry | 41 13 11 N | 090 11 59 W |
| Red Oak Ditch | Canal | 198 | Lee | 41 35 30 N | 089 35 06 W |
| Red Oak Ditch | Canal | 152 | Mason | 40 17 40 N | 089 46 13 W |
| Red Oak Elementary School | School | 201 | Lake | 42 09 45 N | 087 49 11 W |
| Red Oak Park | Park | 205 | Kane | 41 49 30 N | 088 19 03 W |
| Red Oak Picnic Area | Locale | 175 | Clark | 39 20 33 N | 087 42 49 W |
| Red Oak Post Office (historical) | Post Office | 238 | Stephenson | 42 23 33 N | 089 40 23 W |
| Red Oak Ridge | Ridge | 158 | Mason | 40 17 52 N | 089 46 55 W |
| Red Oak School (historical) | School | 190 | Cass | 40 00 18 N | 090 17 28 W |
| Red Oak School (historical) | School | 235 | Henry | 41 13 58 N | 090 12 31 W |
| Red Oak School (historical) | School | 241 | Knox | 40 58 59 N | 090 14 24 W |
| Red Oak School (historical) | School | 154 | Mason | 40 16 59 N | 089 48 38 W |
| Red Oak School (historical) | School | 204 | Vermilion | 40 12 41 N | 087 46 12 W |
| Red Oak United Methodist Church | Church | 248 | Bureau | 41 34 03 N | 089 31 53 W |
| Red River | Stream | | Woodford | 40 40 21 N | 089 10 47 W |
| Red School (historical) | School | 207 | Bureau | 41 28 53 N | 089 41 49 W |
| Red School (historical) | School | 187 | Fulton | 40 34 29 N | 089 55 18 W |
| Red School (historical) | School | 194 | Will | 41 40 02 N | 088 08 44 W |
| Red School Cemetery | Cemetery | 187 | Fulton | 40 34 32 N | 089 55 20 W |
| Red Schoolhouse (historical) | School | 210 | Lake | 42 28 47 N | 087 54 08 W |
| Red Shed Field | Airport | 280 | Stephenson | 42 25 05 N | 089 49 21 W |
| Red Stripe School (historical) | School | 153 | Marion | 38 35 27 N | 089 06 51 W |
| Red Top | Populated Place | 128 | Edwards | 38 22 19 N | 088 01 34 W |
| Red Top Park | Park | 197 | Lake | 42 15 55 N | 087 56 23 W |
| Red Top Plaza Shopping Center | Locale | 205 | Lake | 42 15 40 N | 087 56 48 W |
| Red Top School (historical) | School | 127 | Edwards | 38 22 06 N | 088 01 32 W |
| Red Town School (historical) | School | 214 | Marshall | 41 06 39 N | 089 30 20 W |
| Red Wing Slough | Gut | 207 | Cook | 41 43 01 N | 087 50 59 W |
| Redbird Arena | Building | 239 | McLean | 40 30 38 N | 088 59 55 W |
| Redbird Baseball Field | Park | 239 | McLean | 40 30 55 N | 088 59 57 W |
| Redbird Ridge | Ridge | 98 | Massac | 37 04 42 N | 088 32 30 W |
| Redbird Slough | Lake | 134 | Tazewell | 40 31 22 N | 089 50 49 W |
| Redbrush School (historical) | School | 144 | Perry | 38 10 50 N | 089 09 59 W |
| Redbud Campground | Locale | 163 | Pope | 37 31 11 N | 088 39 28 W |
| Redbud School (historical) | School | 193 | Shelby | 39 26 57 N | 088 56 16 W |
| Redden School (historical) | School | 173 | Johnson | 37 23 13 N | 088 50 16 W |
| Reddick | Populated Place | 186 | Livingston | 41 05 50 N | 088 15 02 W |
| Reddick Elementary School | School | 185 | Kankakee | 41 05 46 N | 088 14 47 W |
| Reddick Hollow | Valley | | Pope | 37 24 50 N | 088 33 33 W |
| Reddick Library | Building | 148 | La Salle | 41 21 01 N | 088 50 29 W |
| Reddick Mansion | Building | 148 | La Salle | 41 21 02 N | 088 50 29 W |
| Reddick Run | Stream | | Grundy | 41 11 04 N | 088 15 14 W |
| Reddick School (historical) | School | 216 | Brown | 39 51 05 N | 090 54 12 W |
| Reddish | Populated Place | 128 | Jersey | 39 08 16 N | 090 34 36 W |
| Reddish Bridge | Bridge | 129 | Jersey | 39 09 50 N | 090 30 09 W |
| Reddish Cemetery | Cemetery | 206 | Jersey | 39 06 31 N | 090 29 16 W |
| Reddish School (historical) | School | 143 | Jersey | 39 08 55 N | 090 33 41 W |
| Reddish-Dunham Ford Cemetery | Cemetery | 182 | Jersey | 39 10 13 N | 090 30 26 W |
| Redeem Tabernacle Church of God in Christ | Church | 185 | Cook | 41 53 50 N | 087 44 46 W |
| Redeemer Evangelical Lutheran Church | Church | 201 | Lake | 42 22 47 N | 087 50 19 W |
| Redeemer Evangelical Lutheran Church | Church | 201 | Lake | 42 10 22 N | 087 49 26 W |
| Redeemer Lutheran Church | Church | 183 | Cook | 41 35 36 N | 087 36 03 W |
| Redeemer Lutheran Church | Church | 185 | Cook | 41 50 57 N | 087 45 22 W |
| Redeemer Lutheran Church | Church | 195 | Cook | 42 00 05 N | 087 50 16 W |
| Redeemer Lutheran Church | Church | 203 | Cook | 41 36 17 N | 087 44 28 W |
| Redeemer Lutheran Church | Church | 215 | DuPage | 41 48 07 N | 087 55 31 W |
| Redeemer Lutheran Church | Church | 213 | DuPage | 41 53 26 N | 087 56 17 W |
| Redeemer Lutheran Church | Church | 202 | Macoupin | 39 07 32 N | 089 49 01 W |
| Redeemer Lutheran Church | Church | 236 | Peoria | 40 46 12 N | 089 37 54 W |
| Redeemer Lutheran Church | Church | 221 | Winnebago | 42 15 32 N | 089 03 53 W |
| Redeemer Lutheran Pre-School | School | 236 | Peoria | 40 46 12 N | 089 37 54 W |
| Redeemer School | School | 185 | Cook | 41 50 57 N | 087 45 22 W |
| Redeeming Church of Christ | Church | 180 | Cook | 41 46 09 N | 087 35 18 W |
| Redeker Airport | Airport | 205 | Iroquois | 40 39 11 N | 087 49 49 W |
| Redfield Commons Park | Park | 213 | DuPage | 41 47 45 N | 088 11 32 W |
| Redford Cemetery | Cemetery | 164 | Jasper | 39 04 34 N | 088 12 12 W |
| Redgate Ridge | Populated Place | 244 | Kane | 41 57 23 N | 088 19 59 W |
| Redhead Lake | Lake | 132 | Cass | 40 06 15 N | 090 21 19 W |
| Redhead Lake | Lake | 224 | Lake | 42 22 25 N | 088 10 49 W |
| Redhead School (historical) | School | 141 | Richland | 38 35 57 N | 087 58 33 W |
| Redmon | Populated Place | 210 | Edgar | 39 38 43 N | 087 51 42 W |
| Redmon Cemetery | Cemetery | 225 | Edgar | 39 34 55 N | 087 41 58 W |
| Redmon Elementary School | School | 221 | Edgar | 39 36 06 N | 087 41 43 W |
| Redoak School (historical) | School | 284 | Boone | 42 21 01 N | 088 55 20 W |
| Redoak School (historical) | School | 146 | Randolph | 38 03 35 N | 089 52 46 W |
| Redpath RLA Airport | Airport | 146 | Randolph | 38 10 55 N | 089 48 30 W |
| Reds Landing State Fish and Waterfowl Manage | Park | 134 | Calhoun | 39 10 14 N | 090 42 00 W |
| Redtop Cemetery | Cemetery | 210 | Vermilion | 40 25 32 N | 087 41 12 W |
| Redtop School (historical) | School | 209 | Vermilion | 40 25 33 N | 087 41 10 W |
| Redwing Slough Forest Preserve | Park | 236 | Lake | 42 27 52 N | 088 03 33 W |
| Redwing Slough Lake | Lake | 235 | Lake | 42 28 30 N | 088 03 04 W |
| Reed Bridge | Bridge | 113 | Wayne | 38 18 05 N | 088 28 35 W |
| Reed Cemetery | Cemetery | 140 | Clay | 38 48 46 N | 088 16 53 W |
| Reed Cemetery | Cemetery | 208 | Coles | 39 30 51 N | 088 01 22 W |
| Reed Cemetery | Cemetery | 182 | Fayette | 39 08 47 N | 089 00 28 W |
| Reed Cemetery | Cemetery | 125 | Franklin | 38 00 06 N | 089 08 14 W |
| Reed Cemetery | Cemetery | 213 | Henderson | 40 55 16 N | 090 50 44 W |
| Reed Cemetery | Cemetery | 174 | Logan | 40 12 55 N | 089 23 22 W |
| Reed Cemetery | Cemetery | 201 | Morgan | 39 35 22 N | 090 06 12 W |
| Reed Cemetery | Cemetery | 268 | Ogle | 41 58 23 N | 089 36 41 W |