| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Black | city | Illinois | United States | 38.47 | -88.10 | 830 | |
| Blackberry Acres | city | Illinois | United States | 41.84 | -88.49 | 830 | |
| Blackberry Knoll | city | Illinois | United States | 41.71 | -88.39 | 830 | |
| Blackberry Woods | city | Illinois | United States | 41.81 | -88.46 | 830 | |
| Blackcrest | city | Illinois | United States | 42.20 | -89.05 | 830 | |
| Blackhawk | city | Illinois | United States | 42.19 | -90.22 | 830 | |
| Blackhawk Estates | city | Illinois | United States | 41.56 | -88.00 | 830 | |
| Blackhawk Island Subdivision | city | Illinois | United States | 42.21 | -89.11 | 830 | |
| Blackhawk Island Subdivision Number 2 | city | Illinois | United States | 42.21 | -89.09 | 830 | |
| Blackland | city | Illinois | United States | 39.76 | -89.10 | 830 | |
| Blacks | city | Illinois | United States | 40.07 | -91.00 | 830 | |
| Blackstone | city | Illinois | United States | 41.08 | -88.69 | 830 | |
| Blaine | city | Illinois | United States | 42.45 | -88.80 | 967 | |
| Blair | city | Illinois | United States | 38.04 | -89.74 | 830 | |
| Blair | city | Illinois | United States | 41.10 | -88.31 | 830 | |
| Blairsville | city | Illinois | United States | 37.81 | -89.12 | 403 | |
| Blairsville | city | Illinois | United States | 38.17 | -88.46 | 400 | |
| Blakes | city | Illinois | United States | 41.46 | -88.75 | 830 | |
| Blanding | city | Illinois | United States | 42.27 | -90.39 | 830 | |
| Blandinsville | city | Illinois | United States | 40.56 | -90.87 | 830 | |
| Block | city | Illinois | United States | 39.97 | -88.09 | 830 | |
| Blodgett | city | Illinois | United States | 41.38 | -88.19 | 830 | |
| Blodgett | city | Illinois | United States | 42.18 | -87.83 | 830 | |
| Bloomfield | city | Illinois | United States | 40.02 | -91.31 | 830 | |
| Bloomfield | city | Illinois | United States | 39.65 | -90.56 | 830 | |
| Bloomfield | city | Illinois | United States | 39.76 | -87.68 | 830 | |
| Bloomfield | city | Illinois | United States | 37.45 | -88.88 | 390 | |
| Bloomfield Village | city | Illinois | United States | 41.69 | -88.08 | 830 | |
| Bloomfield West | city | Illinois | United States | 41.68 | -88.14 | 830 | |
| Bloomingdale | city | Illinois | United States | 41.96 | -88.08 | 830 | |
| Bloomington | city | Illinois | United States | 40.48 | -88.99 | 830 | |
| Bloomington Heights | city | Illinois | United States | 40.48 | -89.03 | 830 | |
| Blue Blaze Mobile Home Estates | city | Illinois | United States | 37.81 | -89.06 | 396 | |
| Blue Grass (historical) | city | Illinois | United States | 40.36 | -87.83 | 830 | |
| Blue Island | city | Illinois | United States | 41.66 | -87.68 | 830 | |
| Blue Mound | city | Illinois | United States | 39.70 | -89.12 | 830 | |
| Blue Point | city | Illinois | United States | 38.54 | -88.49 | 830 | |
| Blue Point | city | Illinois | United States | 39.12 | -88.71 | 830 | |
| Blue Ridge | city | Illinois | United States | 40.27 | -88.49 | 830 | |
| Blueville | city | Illinois | United States | 39.66 | -89.39 | 830 | |
| Bluff City | city | Illinois | United States | 38.96 | -89.05 | 830 | |
| Bluff City | city | Illinois | United States | 40.18 | -90.23 | 830 | |
| Bluff Junction | city | Illinois | United States | 38.82 | -89.98 | 830 | |
| Bluff Springs | city | Illinois | United States | 39.99 | -90.35 | 830 | |
| Bluffs | city | Illinois | United States | 39.75 | -90.54 | 830 | |
| Bluffside | city | Illinois | United States | 38.48 | -90.15 | 830 | |
| Bluford | city | Illinois | United States | 38.33 | -88.73 | 830 | |
| Blyton | city | Illinois | United States | 40.56 | -90.28 | 830 | |
| Blūmingtona | city | Illinois | United States | 40.48 | -88.99 | 830 |