| Coffee & Tea Shops | 124 |
| Coffee Break Service & Supplies | 124 |
| Coffee Brewing Devices | 124 |
| Coffee Houses | 124 |
| Coin Dealers, Supplies, Etc. | 125 |
| Coins & Tokens-Mfrs | 125 |
| Collectibles | 125 |
| Collection Agencies | 125 |
| Commissary Service | 125 |
| Communications Consultants | 125 |
| Community Organizations | 125 |
| Compressors-Air & Gas | 126 |
| Computer-Dealers | 126 |
| Computers & Computer Equipment- Whsle & Mfrs | 126 |
| Computers Networking | 126 |
| Computers-Cable Installation | 126 |
| Computers-Renting & Leasing | 126 |
| Computers-Service & Repair | 127 |
| Computers-Software & Services | 127 |
| Computers-Supplies & Parts | 127 |
| Computers-Support Services | 127 |
| Computers-Systems Designers & Consultants | 128 |
| Computers-Training | 128 |
| Concrete Breaking, Cutting, Sawing, Etc | 128 |
| Concrete Construction Forms & Accessories | 128 |
| Concrete Contractors | 128 |
| Concrete Products | 128 |
| Concrete Pumping Service | 128 |
| Concrete-Ready Mixed | 128 |
| Condominiums | 128 |
| Conference Centers | 129 |
| Conservation Service | 129 |
| Construction Management | 129 |
| Consultants | 129 |
| Consumer Organizations | 129 |
| Contact Lenses | 129 |
| Contractors Equipment & Supplies- Dealers & | 129 |
| Service |
| Contractors Equipment & Supplies- Renting & | 130 |
| Leasing |
| Contractors-Fill | 130 |
| Contractors-General | 130 |
| Contractors’ Equipment & Supplies- Whsle & Mfrs | 133 |
| Convenience Stores | 133 |
| Convention Information Bureaus | 134 |
| Convention Services & Facilities | 134 |
| Conveyors & Conveying Equipment | 134 |
| Cookies & Crackers | 135 |
| Copying & Duplicating Service | 135 |
| Copying Machines-Dealers & Supplies | 135 |
| Cosmetic Services | 135 |
| Cosmetic Therapists (D.C.T.) | 135 |
| Cosmetics & Perfumes | 135 |
| Cosmetics Surgery | 135 |
| Costume Fabrics, Trimmings & Accessories | 135 |
| Costumes-Masquerade & Theatrical | 136 |
| Costumes-Masqurade & Theatrical- Whsle | 136 |
| Counselors-Human Relations | 136 |
| Counselors-Licensed | 136 |
| Countertops | 136 |
| Courier Service | 137 |
| Court Reporters | 137 |