- 1 Blandon, Pennsylvania
- 3 Blankenburg, Rudolph
- 9 Blankets
- 1 Blantyre Mills
- 61 Bleak House
- 6 Bleigh Street
- 4 Blessings
- 1 Blessing's Saw Mill
- 23 Blessington, Marguerite, Countess of, 1789-1849
- 1 Blewitt, Octavian, 1810-1884
- 5 Blind (people)
- 7 Blind man's buff (Sculpture)
- 1 Blind persons
- 8 Blindfolds
- 13 Blind-Institutional Care
- 2 Blinds
- 6 Blizzards
- 9 Block printing (relief printing process)
- 4 Blockely Almshouse
- 2 Blockelyville Hotel
- 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?
