| 1810 | Caps, leather, manufacturing | |
| 1730 | Caps, made in knitting mills | |
| 5232 | Caps, men's and boys', retail | |
| 5131 | Caps, men's and boys', wholesale | |
| 1810 | Caps, textiles, straw, fur-felt and wool-felt, made from purchased fabric | |
| 5131 | Caps, women's and children's, wholesale | |
| 2915 | Capstans, marine, manufacturing | |
| 2429 | Capsules, gelatin, empty, manufacturing | |
| 3190 | Car alarms, manufacturing | |
| 3420 | Car bodies, kit, manufacturing | |
| 5020 | Car clinic (diagnostic centre) | |
| 5020 | Car laundry | |
| 7111 | Car leasing | |
| 7111 | Car rental agency | |
| 6304 | Car rental reservations | |
| 7111 | Car rental, without driver | |
| 2899 | Car seals, metal, manufacturing | |
| 3230 | Car stereos, manufacturing | |
| 3420 | Car trailer, non-commercial, manufacturing | |
| 3420 | Car transporter trailers, multi-car, manufacturing | |
| 5020 | Car upholstering, repair | |
| 5020 | Car wash | |
| 5020 | Car washes, self-service or automatic | |
| 5150 | Car washing equipment, wholesale | |
| 2929 | Car washing machinery, manufacturing | |
| 2710 | Car wheels, rolled steel, made in steel mills | |
| 2411 | Carbides (e.g., boron, calcium, silicon, tungsten), manufacturing | |
| 2927 | Carbines, manufacturing | |
| 2411 | Carbinol (methanol and derivatives), manufacturing | |
| 2413 | Carbohydrate plastics, manufacturing | |
| 2411 | Carbolic acid (phenol), manufacturing | |
| 5142 | Carbon and alloy steels, primary forms and structural shapes, wholesale | |
| 2109 | Carbon and stencil paper, manufacturing | |
| 3311 | Carbon arc lamp units, electrotherapeutic (except infra-red, ultra-violet), manufacturing | |
| 2411 | Carbon black, manufacturing | |
| 5149 | Carbon black, wholesale | |
| 2692 | Carbon brick, manufacturing | |
| 2411 | Carbon dioxide, manufacturing | |
| 2411 | Carbon disulphide, manufacturing | |
| 3190 | Carbon electrodes, manufacturing | |