| Building Maintenance | 97 |
| Building Materials | 97 |
| Building Materials-Used | 97 |
| Building Materials-Whsle | 97 |
| Building Restoration & Preservation | 97 |
| Buildings | 97 |
| Buildings-Metal | 97 |
| Buildings-Pre-Cut, Prefabricated & Modular | 97 |
| Bullet-Resistant Equipment | 97 |
| Burglar Alarm Systems & Monitoring | 97 |
| Burglar Alarm Systems-Mfrs | 97 |
| Burglar Bars | 98 |
| Bus Lines | 98 |
| Buses-Charter & Rental | 98 |
| Business Brokers | 98 |
| Business Cards | 98 |
| Business & Trade Organizations | 99 |
| Business Consultants | 99 |
| Business Forms & Systems | 99 |
| Business Management | 99 |
| Buttons-Advertising & Campaign | 99 |
| C |
| Cabinet Makers | 99 |
| Cabinet Makers-Whsle & Mfrs | 99 |
| Cabinets | 100 |
| Cable Television Service | 100 |
| Calligraphers | 100 |
| Camcorders | 100 |
| Campgrounds & Recreational Vehicle Parks | 100 |
| Camps | 100 |
| Candles | 100 |
| Candles-Whsle & Mfrs | 101 |
| Candy & Confectionery | 101 |
| Candy & Confectionery-Mfrs | 101 |
| Caning | 101 |
| Caning Supplies | 101 |
| Car Washing & Polishing | 101 |
| Carbonic Gas | 101 |
| Career & Vocational Counseling | 101 |
| Caretakers | 101 |
| Cargo & Freight Containers | 101 |
| Carnival Supplies | 101 |
| Carpenters | 101 |
| Carpet & Rug Cleaners | 102 |
| Carpet Installation | 102 |
| Carpet Layers’ Equipment & Supplies | 102 |
| Carpet & Rug Dealers-New | 103 |
| Carpet & Rug Dealers-Used | 105 |
| Carpet & Rug Dyers | 105 |
| Carpet & Rug Repairing | 105 |
| Carports | 105 |
| Carriages-Hire | 105 |
| Cash Registers & Supplies | 105 |
| Casinos | 106 |
| Caskets | 106 |
| Castings | 106 |
| Caterers | 106 |
| Caterers’ Equipment & Supplies | 108 |
| Caterers’ Equipment & Supplies-Whsle | 108 |
| Cathodic Protection Service | 108 |