| 2411 | Carbon inorganic compounds, not specified elsewhere by process, manufacturing | |
| 3190 | Carbon monoxide detectors, manufacturing | |
| 3190 | Carbon or graphite electrodes, manufacturing | |
| 2411 | Carbon organic compounds, not specified elsewhere by process, manufacturing | |
| 2109 | Carbon paper for typewriters, sales books | |
| 2109 | Carbon paper, manufacturing | |
| 5139 | Carbon paper, wholesale | |
| 3190 | Carbon specialties for electrical use, manufacturing | |
| 2411 | Carbon tetrachloride, manufacturing | |
| 2429 | Carbon, activated, manufacturing | |
| 1554 | Carbonated beverages, non-alcoholic, manufacturing | |
| 5122 | Carbonated beverages, wholesale | |
| 1554 | Carbonated mineral waters, manufacturing | |
| 1554 | Carbonated soda, manufacturing | |
| 1554 | Carbonated soft drinks, manufacturing | |
| 2411 | Carbonic acid, manufacturing | |
| 2926 | Carbonizing equipment for processing wool, manufacturing | |
| 1711 | Carbonizing textile fibres | |
| 3190 | Carbons, electric, manufacturing | |
| 3190 | Carbons, lighting and welding, manufacturing | |
| 3190 | Carbons, lighting, manufacturing | |
| 2429 | Carburetor cleaners, manufacturing | |
| 5020 | Carburetor repair | |
| 2912 | Carburetors (except aircraft, motor vehicle), manufacturing | |
| 2912 | Carburetors, aircraft engine, manufacturing | |
| 2912 | Carburetors, motor vehicle engine, manufacturing | |
| 2912 | Carburetors, motor vehicle engine, rebuilding on an assembly line | |
| 5122 | Carcasses, beef, wholesale | |
| 5122 | Carcasses, pork, wholesale | |
| 7430 | Card advertising | |
| 1912 | Card cases (except metal), manufacturing | |
| 5139 | Card games, wholesale | |
| 9249 | Card rooms (e.g. poker rooms) | |
| 3610 | Card table and chair sets, metal, manufacturing | |
| 2102 | Cardboard boxes, corrugated, made from purchased paper or paperboard | |
| 2101 | Cardboard stock, manufacturing | |
| 2101 | Cardboard, laminated or surface coated, made from purchased paperboard | |
| 1729 | Carded nonwoven fabrics, manufacturing | |
| 1711 | Carded yarn, manufacturing | |
| 2423 | Cardiac preparations, manufacturing | |