- 1 Blockley
- 4 Blocks (Toys)
- 23 Blodget, Samuel, 1757-1814, Architect
- 12 Blood
- 1 Blood root
- 1 Bloomfield Hills, Michigan
- 1 Bloomsburg, Pennsylvania
- 2 Blotters (bookkeeping records)
- 3 Blue (color)
- 1 Blue Bell Hotel
- 1 Blue Bell Tavern
- 1 Blue Ribbon Packing Co.
- 4 Blue vitriol
- 5 Blueprints
- 1 Blues music
- 4 Blum Brothers (Firm)
- 1 Blumenthal, Bros. & Co. Boys Fines Clothing
- 2 Blunden's Cotton Factory
- 2 Blunden's Mill
- 3 Blyth, Benjamin, 1746-1787?
- 2 Blyth, Samuel, 1744-1795
- 3 B'nai B'rith
- 1 B'nai B'rith Monument
- 1 Board games (game sets)
- 6 Boarding schools
- 3 Boarding schools (buildings)
- 1 Boardman, Henry A. (Henry Augustus), 1808-1880
- 1 Boards (flat objects)
- 1 Boards of directors
- 1 Boards of trustees
- 4 Boardwalks
- 3 Boars
- 1 Boas, Franziska, 1902-1988
- 6 Boat & ship industry
- 10 Boathouse Row
- 6 Boathouses
- 9 Boating
- 497 Boats
- 1 Boa-Viagem, Baron
- 1 Bobrow Cigar Factory
