- Bannockburn
- Barnett
- Barrington
- Barrington
- Barrington Hills
- Barrington Township
- Bartlett
- Bartonville
- Batavia
- Beach Park
- Beaverville
- Beaverville Township
- Bedford Park
- Beecher
- Belleville
- Bellwood
- Belmont
- Belvidere
- Belvidere township
- Bement
- Bement Township
- Bennington
- Bensenville
- Benson
- Benton
- Berkeley
- Berlin
- Berwyn
- Big Grove
- Big Rock
- Big Rock Township
- Blackberry
- Bloom
- Bloomingdale
- Bloomingdale Township
- Bloomington
- Bloomington City
- Blount
- Blue Island
- Blue Ridge
- Bolingbrook
- Bonfield
- Bonnie Brae
- Bonus
- Boone
- Boulder Hill
- Bourbon
- Bourbonnais
- Bourbonnais township
- Bowdre
- Braceville
- Braceville
- Bradford
- Bradley
- Braidwood
- Bremen
- Brenton
- Bridgeview
- Bristol
- Broadlands
- Broadview
- Brookfield
- Brookfield
- Brooklyn
- Brookville
- Brown
- Bruce
- Buckeye
- Buckingham
- Buckley
- Buda
- Buffalo
- Buffalo Grove
- Bull Valley
- Burbank
- Burlington
- Burlington Township
- Burnham
- Burr Ridge
- Burritt
- Burton
- Burtons Bridge
- Butler
- Byron
- Byron Township