- Back Mountain (Population: 26,690)
- Baden (Population: 4,377)
- Baidland (Population: 1,576)
- Baldwin (Population: 19,999)
- Bally (Population: 1,062)
- Bangor (Population: 5,319)
- Bath (Population: 2,678)
- Beaver Falls (Population: 9,920)
- Beaver (Population: 4,775)
- Beaverdale-Lloydell (Population: 1,230)
- Bedford (Population: 3,141)
- Belfast (Population: 1,301)
- Bell Acres (Population: 1,382)
- Belle Vernon (Population: 1,211)
- Bellefonte (Population: 6,395)
- Belleville (Population: 1,386)
- Bellevue (Population: 8,770)
- Bellwood (Population: 2,016)
- Belmont (Population: 2,846)
- Ben Avon (Population: 1,917)
- Bentleyville (Population: 2,502)
- Berlin (Population: 2,192)
- Berwick (Population: 10,774)
- Bessemer (Population: 1,172)
- Bethel Park (Population: 33,556)
- Bethlehem (Population: 71,329)
- Big Beaver (Population: 2,186)
- Biglerville (Population: 1,101)
- Birdsboro (Population: 5,064)
- Black Lick (Population: 1,438)
- Blairsville (Population: 3,607)
- Blakely (Population: 7,027)
- Blawnox (Population: 1,550)
- Bloomfield (Population: 1,077)
- Bloomsburg (Population: 12,375)
- Blossburg (Population: 1,480)
- Blue Bell (Population: 6,395)
- Boalsburg (Population: 3,578)
- Boiling Springs (Population: 2,769)
- Bonneauville (Population: 1,378)
- Boothwyn (Population: 5,206)
- Boswell (Population: 1,364)
- Boyertown (Population: 3,940)
- Brackenridge (Population: 3,543)
- Braddock Hills (Population: 1,998)
- Braddock (Population: 2,912)
- Bradford (Population: 9,175)
- Bradfordwoods (Population: 1,149)
- Brentwood (Population: 10,466)
- Bressler-Enhaut-Oberlin (Population: 2,809)
- Brickerville (Population: 1,287)
- Bridgeport (Population: 4,371)
- Bridgeville (Population: 5,341)
- Bristol (Population: 9,923)
- Brittany Farms-Highlands (Population: 3,268)
- Brockway (Population: 2,182)
- Brodheadsville (Population: 1,637)
- Brookhaven (Population: 7,985)
- Brookville (Population: 4,230)
- Broomall (Population: 11,046)
- Brownsville (Population: 2,804)
- Bryn Athyn (Population: 1,351)
- Bryn Mawr (Population: 4,382)
- Burgettstown (Population: 1,576)
- Burnham (Population: 2,144)
- Butler (Population: 15,121)
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