|
| 2302 | Cinnabar mining | |
| 3121 | Cinnamon grinding | |
| 3720 | Circle, non-ferrous metal, manufacturing | |
| 3831 | Circuit breaker manufacturing | |
| 9490 | Circus | |
| 9399 | Citizen union | |
| 3511 | Citral manufacturing | |
| 3511 | Citrate manufacturing | |
| 3511 | Citric acid manufacturing | |
| 3511 | Citronellol manufacturing | |
| 9399 | Civic association, non-profit | |
| 8324 | Civil engineer, own account | |
| 9100 | Civil service department | |
| 3114 | Clam broth canning | |
| 3811 | Clamp manufacturing | |
| 3824 | Clamshell excavator manufacturing | |
| 3118 | Clarified beet sugar manufacturing | |
| 3118 | Clarified cane sugar manufacturing | |
| 3902 | Clarinet manufacturing | |
| 3901 | Clasp, handbag, precious metal, manufacturing | |
| 8329 | Classified mailing list compiling and selling | |
| 3824 | Classifier, mining machinery, manufacturing | |
| 3691 | Clay block manufacturing | |
| 3691 | Clay brick manufacturing | |
| 2901 | Clay brick, sun-drying | |
| 3692 | Clay cement, manufacturing | |
| 3691 | Clay conduit manufacturing | |
| 3691 | Clay floater manufacturing | |
| 3691 | Clay flooring manufacturing | |
| 3699 | Clay grinding and treating, not at mine, pit or quarry | |
| 3903 | Clay pigeon manufacturing | |
| 3691 | Clay product manufacturing | |
| 2901 | Clay quarrying | |
| 3691 | Clay refractory cement manufacturing | |
| 3691 | Clay refractory manufacturing | |
| 3691 | Clay ring manufacturing | |
| 3610 | Clay statuary manufacturing | |
| 3691 | Clay stopper manufacturing | |
| 3691 | Clay stove lining manufacturing | |
| 3691 | Clay structural product manufacturing | |
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