Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Bussart Airport | Airport | 217 | Edgar | 39 34 45 N | 087 50 55 W |
| Busse Forest Nature Preserve | Park | 212 | Cook | 42 02 36 N | 088 00 18 W |
| Busse Forest North | Forest | 213 | Cook | 42 02 00 N | 088 00 15 W |
| Busse Forest South | Forest | 212 | Cook | 42 01 33 N | 088 00 07 W |
| Busse Lake | Lake | 209 | Cook | 42 01 30 N | 088 00 34 W |
| Busse Park | Park | 200 | Cook | 42 04 10 N | 087 55 44 W |
| Busse School (historical) | School | 200 | Cook | 42 04 06 N | 087 55 46 W |
| Busse Woods | Woods | 220 | Cook | 42 01 50 N | 087 59 44 W |
| Busse Woods Reservoir | Reservoir | 210 | Cook | 42 01 00 N | 088 00 06 W |
| Buster Pond | Lake | 116 | Franklin | 37 52 21 N | 089 01 31 W |
| Buster White Park | Park | 235 | Warren | 40 54 04 N | 090 38 22 W |
| Buswell Library | Building | 238 | DuPage | 41 52 13 N | 088 05 59 W |
| Busy Beavers Nursery School | School | 183 | Cook | 42 00 04 N | 087 39 50 W |
| Butcher Pond | Lake | 136 | Pike | 39 26 38 N | 090 58 38 W |
| Butler | Populated Place | 192 | Montgomery | 39 11 58 N | 089 32 02 W |
| Butler Branch | Stream | | Vermilion | 40 06 08 N | 087 42 57 W |
| Butler Bridge | Bridge | 119 | Wayne | 38 29 23 N | 088 18 20 W |
| Butler Cemetery | Cemetery | 211 | Brown | 39 53 44 N | 090 51 59 W |
| Butler Cemetery | Cemetery | 119 | Franklin | 37 54 50 N | 089 05 09 W |
| Butler Cemetery | Cemetery | 184 | Montgomery | 39 12 08 N | 089 31 19 W |
| Butler Elementary School | School | 183 | Sangamon | 39 46 54 N | 089 40 07 W |
| Butler Family Cemetery | Cemetery | 133 | Saline | 37 41 11 N | 088 32 56 W |
| Butler Field | Park | 181 | Cook | 41 52 46 N | 087 37 07 W |
| Butler Golf Club | Locale | 201 | DuPage | 41 50 23 N | 087 56 31 W |
| Butler Junior High School | School | 203 | DuPage | 41 50 18 N | 087 55 41 W |
| Butler Lake | Reservoir | 211 | Lake | 42 17 31 N | 087 57 57 W |
| Butler Lake Park | Park | 212 | Lake | 42 17 30 N | 087 57 54 W |
| Butler Park | Park | 181 | Cook | 42 03 14 N | 087 42 17 W |
| Butler School (historical) | School | 182 | Christian | 39 34 30 N | 089 30 05 W |
| Butler School (historical) | School | 212 | DuPage | 41 49 59 N | 087 56 46 W |
| Butler School (historical) | School | 205 | Hancock | 40 13 57 N | 091 09 48 W |
| Butler School (historical) | School | 171 | Madison | 38 58 38 N | 089 52 40 W |
| Butler School (historical) | School | 278 | McHenry | 42 09 40 N | 088 29 48 W |
| Butter Creek | Stream | | Edwards | 38 18 58 N | 088 07 12 W |
| Butter Creek | Stream | | Randolph | 38 02 59 N | 089 54 15 W |
| Butter Ridge | Ridge | 105 | Pulaski | 37 17 23 N | 089 09 58 W |
| Butter Ridge Cemetery | Cemetery | 103 | Pulaski | 37 17 21 N | 089 09 43 W |
| Butter Ridge School (historical) | School | 104 | Pulaski | 37 17 47 N | 089 08 58 W |
| Buttercup Park | Park | 181 | Cook | 41 58 20 N | 087 39 17 W |
| Butterfield Community Church | Church | 226 | Kane | 41 48 46 N | 088 16 45 W |
| Butterfield Country Club | Locale | 214 | DuPage | 41 50 05 N | 087 58 28 W |
| Butterfield Creek | Stream | | Cook | 41 32 46 N | 087 37 26 W |
| Butterfield Elementary School | School | 208 | DuPage | 41 50 11 N | 088 02 31 W |
| Butterfield Family Cemetery | Cemetery | 232 | Knox | 40 54 37 N | 090 18 15 W |
| Butterfield Park | Park | 189 | Cook | 41 32 24 N | 087 38 38 W |
| Butterfield Park | Park | 213 | DuPage | 41 52 25 N | 087 55 34 W |
| Butterfield School | School | 229 | Lake | 42 17 25 N | 087 58 52 W |
| Butterfield School (historical) | School | 166 | La Salle | 41 18 59 N | 088 38 35 W |
| Butterfield School (historical) | School | 225 | Lake | 42 15 19 N | 087 58 45 W |
| Butterfly School (historical) | School | 195 | Cumberland | 39 13 45 N | 088 27 10 W |
| Butterfly School (historical) | School | 150 | Wayne | 38 31 08 N | 088 40 41 W |
| Buttermilk Ditch | Canal | 205 | Coles | 39 23 57 N | 088 23 35 W |
| Buttermilk Hill Beach and Picnic Area | Locale | 131 | Jackson | 37 47 46 N | 089 26 23 W |
| Buttermilk School (historical) | School | 202 | Coles | 39 23 22 N | 088 22 40 W |
| Butternut Cemetery | Cemetery | 174 | Clark | 39 12 15 N | 087 53 16 W |
| Butternut Playlot | Park | 180 | Cook | 41 47 56 N | 087 35 48 W |
| Butternut Preserve | Park | 272 | McHenry | 42 14 18 N | 088 22 40 W |
| Butterworth Elementary School | School | 177 | Rock Island | 41 28 11 N | 090 28 18 W |
| Butterworth Park | Park | 202 | Rock Island | 41 30 43 N | 090 25 46 W |
| Buttonwood Park | Park | 210 | DuPage | 41 45 27 N | 088 10 17 W |
| Butz School (historical) | School | 200 | Kankakee | 41 08 01 N | 087 53 41 W |
| Buxtom Hill | Summit | 207 | Mason | 40 17 20 N | 089 37 26 W |
| Buzzard House | Building | 213 | Coles | 39 28 53 N | 088 10 25 W |
| Buzzard Island | Island | 148 | Hancock | 40 14 22 N | 091 29 50 W |
| Buzzard Island | Island | 165 | Mercer | 41 13 42 N | 091 05 34 W |
| Buzzard Roost Cemetery | Cemetery | 135 | Massac | 37 11 38 N | 088 34 46 W |
| Buzzard Roost Hollow | Valley | | Saline | 37 36 02 N | 088 37 48 W |
| Buzzard School (historical) | School | 183 | Fayette | 39 10 45 N | 088 51 39 W |
| Buzzards Roost | Locale | 139 | Hardin | 37 28 06 N | 088 09 20 W |
| Buzzards Roost Shaft Alcoa Mine | Mine | 134 | Hardin | 37 25 04 N | 088 21 12 W |
| Buzzville | Populated Place | 149 | Mason | 40 21 58 N | 089 59 25 W |
| Byars Cemetery | Cemetery | 161 | Marion | 38 29 12 N | 088 49 01 W |
| Byars School (historical) | School | 161 | Marion | 38 29 24 N | 088 49 42 W |
| Bybee | Populated Place | 208 | Fulton | 40 35 52 N | 090 11 05 W |
| Bybee Cemetery | Cemetery | 180 | Fulton | 40 30 14 N | 089 57 11 W |
| Bybee Cemetery | Cemetery | 207 | Fulton | 40 35 48 N | 090 11 37 W |
| Bybee Cemetery | Cemetery | 204 | Fulton | 40 35 49 N | 090 11 37 W |
| Bybee Station (historical) | Locale | 211 | Fulton | 40 35 53 N | 090 10 45 W |
| Byerton School (historical) | School | 216 | Calhoun | 39 22 52 N | 090 42 54 W |
| Byford Elementary School | School | 189 | Cook | 41 53 50 N | 087 45 57 W |
| Byler Cemetery | Cemetery | 203 | Adams | 40 03 53 N | 091 11 56 W |
| Byler Cemetery Savanna Nature Preserve | Park | 208 | Adams | 40 03 55 N | 091 11 58 W |
| Byley Cemetery | Cemetery | 198 | Hancock | 40 34 41 N | 091 07 43 W |
| Byrd Community Academy (historical) | School | 179 | Cook | 41 54 05 N | 087 38 19 W |
| Byrd Pond | Lake | 135 | Calhoun | 39 09 31 N | 090 41 34 W |
| Byrd School (historical) | School | 164 | Jasper | 39 03 54 N | 088 05 25 W |
| Byrne Hall | Building | 181 | Cook | 41 55 20 N | 087 39 16 W |
| Byrne School | School | 185 | Cook | 41 47 42 N | 087 47 29 W |
| Byrnes School (historical) | School | 172 | Brown | 40 05 23 N | 090 43 08 W |
| Byrnes School (historical) | School | 230 | Peoria | 40 55 24 N | 089 47 39 W |
| Byron | Populated Place | 222 | Ogle | 42 07 37 N | 089 15 20 W |
| Byron City Cemetery | Cemetery | 215 | Ogle | 42 07 33 N | 089 15 04 W |
| Byron City Hall | Building | 221 | Ogle | 42 07 33 N | 089 15 17 W |
| Byron High School | School | 221 | Ogle | 42 07 52 N | 089 15 57 W |
| Byron Hills Estates | Populated Place | 235 | Ogle | 42 08 29 N | 089 16 11 W |
| Byron Middle School | School | 222 | Ogle | 42 07 44 N | 089 15 46 W |
| Byron Nuclear Plant | Locale | 42 | Ogle | 42 04 27 N | 089 16 56 W |
| Byron Post Office | Post Office | 222 | Ogle | 42 07 35 N | 089 15 28 W |
| Byron Public Library | Building | 222 | Ogle | 42 07 32 N | 089 15 32 W |
| Byron Quarry | Mine | 230 | Ogle | 42 08 15 N | 089 15 38 W |
| C A Spry House | Building | 181 | Cook | 41 48 22 N | 087 36 05 W |
| C and E I Reservoir Dam | Dam | 160 | Marion | 38 37 44 N | 088 55 54 W |
| C and EI Reservoir | Reservoir | 160 | Marion | 38 37 44 N | 088 55 54 W |
| C B and Q Railroad Reservoir | Reservoir | 122 | Clinton | 38 34 00 N | 088 08 36 W |
| C B and Q Railroad Reservoir Dam | Dam | 122 | Clinton | 38 34 00 N | 088 08 36 W |
| C B Smith Elementary School | School | 154 | Tazewell | 40 34 48 N | 089 37 58 W |
| C D Maulding Airport | Airport | 240 | Ford | 40 27 00 N | 088 04 30 W |
| C E Brehm Memorial Library | Building | 149 | Jefferson | 38 19 03 N | 088 53 57 W |
| C E Miller Elementary School | School | 227 | DuPage | 41 48 22 N | 087 58 50 W |
| C F Simmons Middle School | School | 221 | Kane | 41 46 44 N | 088 17 12 W |