Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Avon Public Library | Building | 195 | Fulton | 40 39 42 N | 090 26 06 W |
| Avon School (historical) | School | 175 | Clark | 39 17 30 N | 087 41 39 W |
| Avon Senior High School | School | 195 | Fulton | 40 39 53 N | 090 25 47 W |
| Avon Township Hall | Building | 246 | Lake | 42 21 23 N | 088 04 18 W |
| Avon United Methodist Church | Church | 194 | Fulton | 40 39 44 N | 090 25 59 W |
| Avondale (subdivision) | Populated Place | 182 | Cook | 41 56 20 N | 087 42 40 W |
| Avondale Elementary School | School | 181 | Cook | 41 56 06 N | 087 42 29 W |
| Avondale Lake | Reservoir | 179 | Fulton | 40 39 48 N | 090 25 18 W |
| Avondale Park | Park | 183 | Cook | 41 56 29 N | 087 42 55 W |
| Avy School (historical) | School | 262 | Stephenson | 42 20 48 N | 089 23 53 W |
| Axehead Lake | Lake | 190 | Cook | 42 00 29 N | 087 51 56 W |
| Ayers | Populated Place | 180 | Bond | 38 57 49 N | 089 27 07 W |
| Ayers | Populated Place | 184 | Carroll | 42 03 14 N | 090 06 56 W |
| Ayers Sand Prairie State Nature Preserve | Park | 186 | Carroll | 42 03 15 N | 090 06 22 W |
| Ayers School (historical) | School | 218 | Henry | 41 20 46 N | 090 06 22 W |
| Aylesworth Branch | Stream | | Fulton | 40 36 00 N | 090 21 04 W |
| Azotus Cemetery | Cemetery | 159 | Pope | 37 12 55 N | 088 31 20 W |
| B Alexander Elementary School | School | 248 | Henry | 41 14 55 N | 089 54 19 W |
| B and A Lake | Lake | 129 | Franklin | 37 56 20 N | 089 05 13 W |
| B and L Heliport | Airport | 193 | Cook | 41 56 29 N | 087 51 34 W |
| B J Hooper Elementary School | School | 244 | Lake | 42 24 31 N | 088 01 21 W |
| B'Nai Abraham Cemetery | Cemetery | 197 | Cook | 41 56 45 N | 087 47 31 W |
| B'nai Israel Cemetery | Cemetery | 201 | Kankakee | 41 07 08 N | 087 48 32 W |
| B'Nai Israel Cemetery | Cemetery | 154 | St. Clair | 38 29 51 N | 089 55 49 W |
| B'nai Torah Highland Park Reform Temple | Church | 201 | Lake | 42 12 12 N | 087 47 54 W |
| B'nai Zaken Congregation | Church | 183 | Cook | 41 49 03 N | 087 37 16 W |
| Babb Cemetery | Cemetery | 171 | Marshall | 40 58 23 N | 089 25 08 W |
| Babb Slough | Lake | 134 | Marshall | 40 57 24 N | 089 26 12 W |
| Babbit Cemetery | Cemetery | 196 | Fulton | 40 42 28 N | 090 24 08 W |
| Babbling Brook | Stream | | Ogle | 41 54 55 N | 089 21 24 W |
| Babbs Grove Cemetery | Cemetery | 296 | Stephenson | 42 16 44 N | 089 46 37 W |
| Babbs Grove School (historical) | School | 295 | Stephenson | 42 16 43 N | 089 46 39 W |
| Babbs Hollow | Valley | | Jersey | 38 57 45 N | 090 23 21 W |
| Babcock | Populated Place | 177 | Rock Island | 41 31 46 N | 090 23 45 W |
| Babcock Hall | Building | 230 | Champaign | 40 05 59 N | 088 13 15 W |
| Babcock's Grove Cemetery | Cemetery | 217 | DuPage | 41 52 41 N | 088 01 07 W |
| Babe Ruth Park | Park | 192 | Cook | 41 52 35 N | 087 51 47 W |
| Baber Woods Nature Preserve | Park | 240 | Edgar | 39 29 42 N | 087 53 56 W |
| Baby Hollow | Valley | | Jersey | 38 58 13 N | 090 25 56 W |
| Babylon | Populated Place | 157 | Fulton | 40 35 27 N | 090 20 57 W |
| Babylon Bend Bridge | Bridge | 150 | Fulton | 40 35 24 N | 090 20 52 W |
| Babylon School (historical) | School | 193 | Fulton | 40 35 20 N | 090 21 30 W |
| Bach Slough | Gut | 132 | Cass | 40 07 06 N | 090 21 37 W |
| Bache Memorial Chapel | Church | 243 | Bureau | 41 33 11 N | 089 21 53 W |
| Bache Memorial Church | Church | 202 | Douglas | 39 47 34 N | 088 21 56 W |
| Bachelor Grove | Woods | 200 | Cook | 41 37 59 N | 087 47 05 W |
| Bachelor Grove Cemetery | Cemetery | 197 | Cook | 41 37 51 N | 087 46 15 W |
| Bachman School (historical) | School | 208 | Putnam | 41 13 13 N | 089 27 23 W |
| Back Branch | Stream | | Jefferson | 38 15 40 N | 089 03 11 W |
| Back Creek | Stream | | Washington | 38 18 01 N | 089 17 33 W |
| Back Lake | Lake | 135 | Mason | 40 04 16 N | 090 13 25 W |
| Back of the Yards (subdivision) | Populated Place | 182 | Cook | 41 48 27 N | 087 39 58 W |
| Back to God Christian Reformed Church | Church | 182 | Cook | 41 45 37 N | 087 39 15 W |
| Backbone Cemetery | Cemetery | 162 | Jasper | 39 08 59 N | 087 57 55 W |
| Backbone Ridge | Ridge | 147 | Jackson | 37 38 13 N | 089 30 33 W |
| Bacon Branch | Stream | | Fayette | 39 09 43 N | 088 53 55 W |
| Bacon Cemetery | Cemetery | 192 | Macoupin | 39 22 32 N | 089 54 49 W |
| Bader | Populated Place | 188 | Schuyler | 40 10 23 N | 090 22 07 W |
| Bader Cemetery | Cemetery | 187 | Schuyler | 40 09 57 N | 090 22 32 W |
| Badger Creek | Stream | | Fulton | 40 27 25 N | 090 21 39 W |
| Badgley Cemetery | Cemetery | 175 | St. Clair | 38 32 56 N | 089 59 54 W |
| Badsby Cemetery | Cemetery | 145 | St. Clair | 38 37 28 N | 089 47 52 W |
| Baehr Branch | Stream | | Brown | 39 55 53 N | 090 35 20 W |
| Bagdad School (historical) | School | 201 | Douglas | 39 40 51 N | 088 23 15 W |
| Baggs School (historical) | School | 169 | Clark | 39 21 26 N | 087 37 45 W |
| Baha'i Faith | Church | 210 | Peoria | 40 45 02 N | 089 36 45 W |
| Bahai Chicago Center | Church | 182 | Cook | 41 52 49 N | 087 37 29 W |
| Bahai Temple | Church | 184 | Cook | 42 04 28 N | 087 41 04 W |
| Bahar Center | School | 181 | Cook | 41 45 40 N | 087 34 57 W |
| Bail Creek | Stream | | Wayne | 38 25 47 N | 088 16 35 W |
| Bail Creek Lateral | Canal | 116 | Wayne | 38 25 47 N | 088 15 53 W |
| Bailey Branch | Stream | | Montgomery | 39 13 56 N | 089 11 29 W |
| Bailey Cemetery | Cemetery | 165 | Effingham | 38 59 36 N | 088 38 55 W |
| Bailey Cemetery | Cemetery | 208 | Fulton | 40 20 19 N | 090 25 44 W |
| Bailey Cemetery | Cemetery | 170 | Jasper | 38 59 31 N | 088 20 25 W |
| Bailey Cemetery | Cemetery | 207 | McDonough | 40 25 35 N | 090 41 43 W |
| Bailey Church | Church | 136 | Wayne | 38 26 21 N | 088 35 13 W |
| Bailey Creek | Stream | | La Salle | 41 16 27 N | 089 02 21 W |
| Bailey Falls (historical) | Populated Place | 150 | La Salle | 41 16 38 N | 089 02 39 W |
| Bailey Lake | Lake | 132 | Calhoun | 39 04 46 N | 090 40 41 W |
| Bailey Memorial Cemetery | Cemetery | 222 | Champaign | 39 59 44 N | 088 16 27 W |
| Bailey Park | Park | 221 | Adams | 40 03 03 N | 091 03 59 W |
| Bailey School (historical) | School | 248 | Boone | 42 10 26 N | 088 55 13 W |
| Bailey School (historical) | School | 189 | Cass | 39 57 33 N | 090 03 09 W |
| Bailey School (historical) | School | 208 | Fulton | 40 20 19 N | 090 25 43 W |
| Bailey School (historical) | School | 238 | Winnebago | 42 19 56 N | 089 16 22 W |
| Baileyville | Populated Place | 282 | Ogle | 42 11 50 N | 089 35 36 W |
| Baileyville Baptist Church | Church | 283 | Ogle | 42 11 57 N | 089 35 45 W |
| Baileyville Post Office | Post Office | 282 | Ogle | 42 11 48 N | 089 35 36 W |
| Baileyville Reformed Church | Church | 291 | Ogle | 42 11 50 N | 089 35 47 W |
| Bailff Cemetery | Cemetery | 153 | Clark | 39 10 26 N | 087 41 57 W |
| Bails School (historical) | School | 216 | Coles | 39 26 33 N | 088 12 19 W |
| Bails Timberline Lake | Reservoir | 178 | Fayette | 39 02 24 N | 088 51 54 W |
| Bails Timberline Lake Dam | Dam | 178 | Fayette | 39 02 24 N | 088 51 54 W |
| Baily Cemetery | Cemetery | 154 | Jasper | 39 03 59 N | 087 59 16 W |
| Bainbridge | Populated Place | 132 | Williamson | 37 44 02 N | 088 59 35 W |
| Bainbridge Cemetery | Cemetery | 131 | Williamson | 37 44 00 N | 088 59 37 W |
| Bainbridge Greens Park | Park | 215 | DuPage | 41 47 23 N | 088 11 28 W |
| Baird Cemetery | Cemetery | 170 | Scott | 39 41 19 N | 090 33 14 W |
| Baird School (historical) | School | 221 | Knox | 40 53 16 N | 090 02 36 W |
| Baird-Pumphrey Cemetery | Cemetery | 271 | Lee | 41 37 19 N | 089 16 02 W |
| Bais Yaakov School | School | 182 | Cook | 41 59 10 N | 087 41 30 W |
| Bais Yaakov School | School | 180 | Cook | 41 59 34 N | 087 41 59 W |
| Baitter Branch | Stream | | Macoupin | 39 30 38 N | 090 06 38 W |
| Baity School (historical) | School | 155 | Clay | 38 37 01 N | 088 37 18 W |
| Baker | Populated Place | 205 | La Salle | 41 33 20 N | 088 48 40 W |
| Baker Airport | Airport | 216 | Mason | 40 08 07 N | 091 00 34 W |
| Baker Cemetery | Cemetery | 138 | Crawford | 38 54 06 N | 087 33 38 W |
| Baker Cemetery | Cemetery | 206 | La Salle | 41 33 56 N | 088 48 46 W |
| Baker Cemetery | Cemetery | 152 | Mason | 40 11 45 N | 089 56 52 W |