- 8 Brass industry
- 4 Brass instruments
- 5 Brasswork
- 2 Braucherei
- 1 Braunschweig, Germany (national district)
- 1 Brayton, George Bailey, 1830-1892
- 17 Brazil
- 1 Brazilian Cafe
- 3 Brazilian Commissioners Building
- 1 Brazilian Court
- 1 Brazilian Pavilion
- 1 Brazillian Cotton Pavilion
- 7 Bread
- 1 Bread baskets (containers for food service)
- 5 Bread Street
- 1 Breakfast rooms
- 2 Breaking
- 1 Breaks
- 1 Brecht, F. Cigar Box Factory
- 1 Breck, Samuel 1771-1862
- 1 Breckinridge, Robert Jefferson, 1800-1871
- 1 Brehm and Stehle (Allegheny Avenue Dye Works)
- 1 Bremen, Germany
- 2 Brenner, Scott Francis, 1903-
- 1 Bretons
- 171 Breviaries
- 24 Breweries
- 4 Brewers' Building
- 1 Brewery Hill Drive
- 25 Brewerytown, Pennsylvania
- 12 Brewing industry
- 1 Briand, Aristide, 1862-1932
- 1 Brice, William & Allen, John & Co. Pork Packers
- 11 Bricks
- 5 Brickwork
- 8 Brickworks (factories)
- 6 brickyards
- 1 Bridegrooms
- 1 Brides
- 33 Bridesburg
