- Baldwin (Population: 3,627)
- Bannockburn (Population: 1,429)
- Barrington Hills (Population: 3,915)
- Barrington (Population: 10,168)
- Barry (Population: 1,368)
- Bartlett (Population: 36,706)
- Bartonville (Population: 6,310)
- Batavia (Population: 23,866)
- Beach Park (Population: 10,072)
- Beardstown (Population: 5,766)
- Beckemeyer (Population: 1,043)
- Beecher (Population: 2,033)
- Belleville (Population: 41,410)
- Bellevue (Population: 1,887)
- Bellwood (Population: 20,535)
- Belvidere (Population: 20,820)
- Bement (Population: 1,784)
- Benld (Population: 1,541)
- Bensenville (Population: 20,703)
- Benton (Population: 6,880)
- Berkeley (Population: 5,245)
- Berwyn (Population: 54,016)
- Bethalto (Population: 9,454)
- Bethany (Population: 1,287)
- Bloomingdale (Population: 21,675)
- Bloomington (Population: 64,808)
- Blue Island (Population: 23,463)
- Blue Mound (Population: 1,129)
- Bolingbrook (Population: 56,321)
- Boulder Hill (Population: 8,169)
- Bourbonnais (Population: 15,256)
- Bradley (Population: 12,784)
- Braidwood (Population: 5,203)
- Breese (Population: 4,048)
- Bridgeport (Population: 2,168)
- Bridgeview (Population: 15,335)
- Brighton (Population: 2,196)
- Broadview (Population: 8,264)
- Brookfield (Population: 19,085)
- Brookport (Population: 1,054)
- Buffalo Grove (Population: 42,909)
- Bunker Hill (Population: 1,801)
- Burbank (Population: 27,902)
- Burnham (Population: 4,170)
- Burr Ridge (Population: 10,408)
- Bushnell (Population: 3,221)
- Byron (Population: 2,917)
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