Places beginning with BL in Illinois, United States
- Black
- Blackberry Acres
- Blackberry, Township of
- Blackberry Woods
- Blackcrest (subdivision)
- Blackhawk
- Blackhawk Island Subdivision Number 2 (subdivision)
- Blackhawk Island Subdivision (subdivision)
- Blackhawk, Township of
- Blackland
- Blacks
- Blackstone
- Blaine
- Blair
- Blair
- Blair Election Precinct
- Blairsville
- Blairsville
- Blair, Township of
- Blakes
- Blanding
- Blandinsville
- Blandinsville, Township of
- Blissville, Township of
- Block
- Blodgett
- Blodgett (subdivision)
- Bloomfield
- Bloomfield
- Bloomfield
- Bloomfield
- Bloomfield Election Precinct
- Bloomfield Election Precinct
- Bloomfield, Township of
- Bloomingdale
- Bloomingdale, Township of
- Bloomington
- Bloomington City, Township of
- Bloomington Heights
- Bloomington, Township of
- Bloom, Township of
- Blount, Township of
- Blue Grass (historical)
- Blue Island
- Blue Mound
- Blue Mound, Township of
- Blue Mound, Township of
- Blue Point
- Blue Point
- Blue Ridge
- Blue Ridge, Township of
- Blueville
- Bluff City
- Bluff City
- Bluffdale, Township of
- Bluff Junction
- Bluffs
- Bluffside
- Bluff Springs
- Bluff Springs, Township of
- Bluford
- Blyton