| 3720 | Babbitt metal manufacturing | |
| 3220 | Baby bunting cutting and sewing | |
| 3213 | Baby bunting, knitted, manufacturing | |
| 3849 | Baby carriage manufacturing | |
| 3121 | Baby food, not with milk base, manufacturing | |
| 3112 | Baby food, with milk base, manufacturing | |
| 9530 | Baby sitting service | |
| 3849 | Baby walker manufacturing | |
| 3111 | Bacon curing and smoking | |
| 9320 | Bacteriological research laboratory, not manufacturing | |
| 3909 | Badge, except fabric, manufacturing | |
| 3212 | Badge, fabric, cutting and sewing | |
| 3903 | Badminton equipment manufacturing | |
| 3212 | Bag, garment, cutting and sewing | |
| 3412 | Bag, paper, manufacturing | |
| 3212 | Bag, school, manufacturing | |
| 3849 | Baggage hand truck manufacturing | |
| 7191 | Baggage transfer service | |
| 8321 | Bailiff | |
| 5000 | Bailing oil wells, contract services | |
| 3117 | Bake shop, baking on premises | |
| 3121 | Baked bean, not canned, manufacturing | |
| 3121 | Bakers' and confectioners' colours, manufacturing | |
| 3824 | Bakery machinery manufacturing | |
| 3824 | Bakery oven manufacturing | |
| 3521 | Baking japan manufacturing | |
| 3121 | Baking powder manufacturing | |
| 3851 | Balance, apothecary, manufacturing | |
| 3851 | Balance, chemical, manufacturing | |
| 3825 | Balance, excluding apothecary and chemical, manufacturing | |
| 3559 | Balata products manufacturing | |
| 3819 | Bale tie manufacturing | |
| 3822 | Baler manufacturing | |
| 3829 | Ball bearing manufacturing | |
| 2901 | Ballast crushing | |
| 2901 | Ballast quarrying | |
| 2901 | Ballast washing | |
| 9414 | Ballet production | |
| 9310 | Ballet school | |
| 3240 | Ballet slipper manufacturing | |