Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Blair Cemetery | Cemetery | 318 | Jo Daviess | 42 18 34 N | 089 56 15 W |
| Blair Cemetery | Cemetery | 206 | Pike | 39 40 35 N | 091 02 44 W |
| Blair Cemetery | Cemetery | 141 | Williamson | 37 49 48 N | 088 53 52 W |
| Blair Election Precinct | Civil | 156 | Randolph | 38 02 39 N | 089 44 33 W |
| Blair Park | Park | 224 | Champaign | 40 05 58 N | 088 12 23 W |
| Blair Park | Park | 215 | Lake | 42 16 50 N | 087 51 19 W |
| Blair School | School | 187 | Cook | 41 46 35 N | 087 47 23 W |
| Blair School (historical) | School | 158 | Jasper | 38 51 43 N | 088 12 21 W |
| Blair School (historical) | School | 146 | Randolph | 38 01 51 N | 089 44 29 W |
| Blairsville | Populated Place | 117 | Hamilton | 38 10 06 N | 088 27 51 W |
| Blairsville | Populated Place | 122 | Williamson | 37 48 40 N | 089 07 25 W |
| Blaisdell Hall | Building | 229 | Champaign | 40 06 01 N | 088 13 10 W |
| Blake School (historical) | School | 178 | Christian | 39 42 50 N | 089 20 46 W |
| Blake School (historical) | School | 240 | Ford | 40 27 58 N | 088 01 21 W |
| Blake School (historical) | School | 267 | Winnebago | 42 22 20 N | 089 22 45 W |
| Blakemans Ford | Crossing | 174 | Coles | 39 27 25 N | 088 08 50 W |
| Blakes | Populated Place | 186 | La Salle | 41 27 31 N | 088 45 10 W |
| Blakeslee Cemetery | Cemetery | 205 | Knox | 40 44 27 N | 090 06 00 W |
| Blalock Creek | Stream | | Woodford | 40 50 57 N | 089 30 21 W |
| Blanchard Chute | Stream | | Rock Island | 41 19 25 N | 091 03 57 W |
| Blanchard Hall | Building | 238 | DuPage | 41 52 07 N | 088 05 58 W |
| Blanchard Island | Island | 165 | Rock Island | 41 21 17 N | 091 03 45 W |
| Blanchard Island Recreation Area | Park | 165 | Rock Island | 41 20 53 N | 091 03 21 W |
| Blanchard Road Alliance Church | Church | 229 | DuPage | 41 50 15 N | 088 06 00 W |
| Blanchard School (historical) | School | 224 | Ford | 40 25 09 N | 088 05 54 W |
| Blanchard School (historical) | School | 196 | Lake | 42 23 58 N | 087 49 44 W |
| Blanchard School (historical) | School | 238 | Stephenson | 42 15 32 N | 089 31 57 W |
| Blanche and Frank L Seaver Physical Education Building | Building | 258 | Winnebago | 42 16 07 N | 089 00 57 W |
| Blanche Walker Burpee Center | Building | 259 | Winnebago | 42 16 11 N | 089 01 07 W |
| Bland Landing Strip | Airport | 201 | Moultrie | 39 37 50 N | 088 44 45 W |
| Blanding | Populated Place | 200 | Jo Daviess | 42 16 29 N | 090 23 09 W |
| Blanding Landing Recreation Area | Locale | 184 | Jo Daviess | 42 17 09 N | 090 24 12 W |
| Blandinsville | Populated Place | 222 | McDonough | 40 33 22 N | 090 51 57 W |
| Blandinsville City Lake Dam | Dam | 220 | McDonough | 40 33 48 N | 090 52 00 W |
| Blandinsville City Reservoir | Reservoir | 220 | McDonough | 40 33 48 N | 090 52 00 W |
| Blandinsville School (historical) | School | 220 | McDonough | 40 33 17 N | 090 52 06 W |
| Blandinsville United Methodist Church | Church | 221 | McDonough | 40 33 20 N | 090 52 06 W |
| Blandinsville-Hire Community Center | Building | 220 | McDonough | 40 33 17 N | 090 52 06 W |
| Blanke Lake | Lake | 127 | Clinton | 38 34 00 N | 089 22 57 W |
| Blankenship Cemetery | Cemetery | 165 | Fayette | 39 08 34 N | 088 58 21 W |
| Blankenship Cemetery | Cemetery | 175 | Marion | 38 29 47 N | 088 48 07 W |
| Blatchford Building | Building | 182 | Cook | 41 53 10 N | 087 38 30 W |
| Blazer School (historical) | School | 193 | McDonough | 40 21 06 N | 090 39 28 W |
| Blessed Agnes Roman Catholic Church | Church | 182 | Cook | 41 50 34 N | 087 42 52 W |
| Blessed Agnes School | School | 182 | Cook | 41 50 35 N | 087 42 50 W |
| Blessed Hope Bible Church | Church | 244 | Winnebago | 42 13 45 N | 089 03 43 W |
| Blessed Jurgis Matulaitis Lithuanian Catholic Mission | Church | 226 | Cook | 41 39 37 N | 087 59 00 W |
| Blessed Sacrament Church | Church | 214 | Tazewell | 40 35 59 N | 089 28 06 W |
| Blessed Sacrament Roman Catholic Church | Church | 182 | Cook | 41 51 07 N | 087 42 57 W |
| Blessed Sacrament School | School | 183 | Sangamon | 39 46 56 N | 089 39 54 W |
| Blessed Sacrament School | School | 214 | Tazewell | 40 35 58 N | 089 28 01 W |
| Blessed Sacrament/Our Lady of Lourdes School (historical) | School | 182 | Cook | 41 51 08 N | 087 42 55 W |
| Blessed Trinity Temple of Divine Science | Church | 178 | Cook | 41 44 18 N | 087 35 05 W |
| Blessing Hospital | Hospital | 189 | Adams | 39 56 11 N | 091 23 57 W |
| Blessing Hospital Heliport | Airport | 189 | Adams | 39 56 11 N | 091 23 57 W |
| Blickhan Landing Area | Airport | 192 | Adams | 40 00 30 N | 091 22 56 W |
| Blind Charleys Corner | Locale | 186 | Whiteside | 41 53 15 N | 090 05 09 W |
| Blind Hollow | Valley | | Hardin | 37 34 20 N | 088 07 58 W |
| Blind Horse Ridge | Ridge | 183 | Sangamon | 39 48 04 N | 089 17 22 W |
| Blinkiron Park | Park | 154 | Tazewell | 40 33 47 N | 089 38 43 W |
| Blinn School (historical) | School | 216 | Henry | 41 20 03 N | 089 54 17 W |
| Bliss Cemetery | Cemetery | 209 | Champaign | 40 01 44 N | 088 02 39 W |
| Bliss Park | Park | 179 | Effingham | 39 06 51 N | 088 32 40 W |
| Bliss School (historical) | School | 208 | Knox | 40 45 05 N | 090 17 28 W |
| Bliss Woods County Forest Preserve | Park | 215 | Kane | 41 47 07 N | 088 26 27 W |
| Bliss Woods Nature Preserve | Park | 218 | Kane | 41 46 56 N | 088 26 02 W |
| Blissville Polling House (historical) | Building | 156 | Jefferson | 38 15 28 N | 089 07 11 W |
| Blissville Townhall | Building | 151 | Jefferson | 38 15 28 N | 089 06 19 W |
| Blizzard Cemetery | Cemetery | 176 | Clark | 39 17 48 N | 087 43 19 W |
| Blizzard Ford | Crossing | 164 | Clark | 39 26 02 N | 087 41 20 W |
| Block | Populated Place | 218 | Champaign | 39 58 06 N | 088 05 08 W |
| Block Airport | Airport | 247 | Carroll | 42 11 30 N | 089 50 17 W |
| Block Cemetery | Cemetery | 178 | Cumberland | 39 12 05 N | 088 07 09 W |
| Block Park | Park | 183 | Cook | 41 42 22 N | 087 37 54 W |
| Block School (historical) | School | 164 | Jefferson | 38 20 39 N | 088 52 23 W |
| Blockhouse Cemetery | Cemetery | 128 | Saline | 37 38 12 N | 088 28 33 W |
| Blodgett | Populated Place | 158 | Will | 41 22 39 N | 088 11 24 W |
| Blodgett (subdivision) | Populated Place | 201 | Lake | 42 10 35 N | 087 49 35 W |
| Blodgett Cemetery | Cemetery | 224 | DuPage | 41 47 20 N | 088 02 00 W |
| Blomquist Memorial Recreation Center | Building | 183 | Cook | 42 03 15 N | 087 40 43 W |
| Blood of Christ Spiritual Temple | Church | 182 | Cook | 41 47 10 N | 087 39 15 W |
| Blood School (historical) | School | 129 | Edwards | 38 32 25 N | 088 07 34 W |
| Bloods Point Cemetery | Cemetery | 256 | Boone | 42 10 31 N | 088 50 16 W |
| Bloods Point School (historical) | School | 271 | Boone | 42 11 23 N | 088 50 09 W |
| Bloom Cemetery | Cemetery | 134 | Clay | 38 37 57 N | 088 26 50 W |
| Bloom Church | Church | 136 | Clay | 38 37 56 N | 088 26 52 W |
| Bloom Community College | School | 200 | Cook | 41 30 46 N | 087 38 38 W |
| Bloom High School | School | 198 | Cook | 41 30 53 N | 087 38 37 W |
| Bloom Presbyterian Cemetery | Cemetery | 213 | Cook | 41 29 42 N | 087 38 18 W |
| Bloom School (historical) | School | 196 | Kankakee | 41 14 23 N | 087 55 30 W |
| Bloom School of Jazz | School | 180 | Cook | 41 54 01 N | 087 37 37 W |
| Bloom Trail High School | School | 206 | Cook | 41 29 02 N | 087 35 40 W |
| Bloomfield | Populated Place | 223 | Adams | 40 01 15 N | 091 18 26 W |
| Bloomfield | Populated Place | 194 | Edgar | 39 45 34 N | 087 40 57 W |
| Bloomfield | Populated Place | 127 | Johnson | 37 27 09 N | 088 52 30 W |
| Bloomfield | Populated Place | 137 | Scott | 39 39 07 N | 090 33 22 W |
| Bloomfield Cemetery | Cemetery | 192 | Edgar | 39 45 59 N | 087 40 40 W |
| Bloomfield Cemetery | Cemetery | 181 | Scott | 39 39 11 N | 090 32 30 W |
| Bloomfield Election Precinct | Civil | 115 | Johnson | 37 28 12 N | 088 52 46 W |
| Bloomfield Election Precinct | Civil | 136 | Scott | 39 39 11 N | 090 33 26 W |
| Bloomfield School (historical) | School | 193 | Edgar | 39 45 30 N | 087 40 00 W |
| Bloomfield School (historical) | School | 136 | Scott | 39 39 09 N | 090 33 21 W |
| Bloomfield School (historical) | School | 122 | Wayne | 38 19 24 N | 088 31 21 W |
| Blooming Grove Cemetery | Cemetery | 240 | McLean | 40 25 30 N | 088 58 24 W |
| Blooming Grove Christian Church | Church | 192 | Macoupin | 39 25 23 N | 089 55 32 W |
| Blooming Grove Church | Church | 151 | Hamilton | 38 07 45 N | 088 33 30 W |
| Blooming Grove Church (historical) | Church | 247 | McLean | 40 25 45 N | 088 57 37 W |
| Blooming Grove School (historical) | School | 196 | Macoupin | 39 25 21 N | 089 55 29 W |
| Blooming Rose Deliverance Church | Church | 182 | Cook | 41 46 17 N | 087 38 41 W |
| Bloomingdale | Populated Place | 233 | DuPage | 41 57 27 N | 088 04 51 W |