| Navn | Postnummer | By |
|---|---|---|
| C.K. Environment A/S | 3500 | Værløse |
| Cadskolen A/S | 9000 | Aalborg |
| Ceetec A/S | 5500 | Middelfart |
| CESCO A/S | 6690 | Gørding |
| Colloc ApS | 8381 | Tilst |
| Colour Compagniet A/S | 6933 | Kibæk |
| Complement A/S | 7100 | Vejle |
| Copenhagen Hardwood ApS | 3670 | Veksø Sjælland |
| CP ApS | 4130 | Viby Sjælland |
| Cube Design A/S | 8450 | Hammel |