| 2429 | Barbecue starter fluids, manufacturing | |
| 2930 | Barbecues, gas, manufacturing | |
| 2930 | Barbecues, grills, and braziers for outdoor cooking, manufacturing | |
| 2899 | Barbed and twisted wire, made in wire drawing plants | |
| 2899 | Barbed wire, made from purchased wire | |
| 2930 | Barbeque grills (charcoal), manufacturing | |
| 9302 | Barber and beauty shops, combined | |
| 8090 | Barber colleges | |
| 5150 | Barber shop equipment and supplies, wholesale | |
| 9302 | Barber shops | |
| 8090 | Barbering schools | |
| 2930 | Barbers' clippers, electric, manufacturing | |
| 2893 | Barbers' scissors, manufacturing | |
| 1810 | Barbers' service apparel, washable, men' s and boys', cutting and sewing purchased fabric | |
| 2423 | Barbiturate preparations, manufacturing | |
| 2423 | Barbiturates, uncompounded, manufacturing | |
| 2423 | Barbituric acid, manufacturing | |
| 7112 | Bareboat (vessel) chartering | |
| 3511 | Barge sections, prefabricated metal, manufacturing | |
| 6110 | Barge transport service, coastal | |
| 3511 | Barges, building | |
| 1421 | Barite mining | |
| 2699 | Barite, processing beyond beneficiating | |
| 2411 | Barium compounds, not specified elsewhere by process, manufacturing | |
| 2411 | Barium hydroxide, manufacturing | |
| 2423 | Barium in-vivo diagnostic substances, manufacturing | |
| 1421 | Barium ore mining | |
| 2699 | Barium, processing beyond beneficiating | |
| 2010 | Barking (rossing) logs | |
| 2010 | Barking mill | |
| 0200 | Barks, gathering of | |
| 0111 | Barley farming | |
| 1533 | Barley feed, chopped, crushed or ground, manufacturing | |
| 1531 | Barley flour, manufacturing | |
| 1553 | Barley malt, manufacturing | |
| 5121 | Barley, wholesale | |
| 5150 | Barn machinery and equipment (including elevating), wholesale | |
| 2811 | Barn stanchions and standards, metal, manufacturing | |
| 3511 | Barnacle removing from ships | |
| 3312 | Barographs, manufacturing | |