| # | Company name | Role | # of projects |
|---|---|---|---|
| 201 | Constructiebureau Maaskant | Structural engineering | 2 |
| 202 | Construction Coordination Ltd | Structural engineering | 2 |
| 203 | Construction Engineering Group | Structural engineering | 8 |
| 204 | Consultants Geniplus Inc. | Structural engineering | 1 |
| 205 | Consulting Engineers Collaborative | Structural engineering | 0 |
| 206 | Consulting Engineers Corp | Structural engineering | 1 |
| 207 | Consulting Engineers Corporation | Structural engineering | 1 |
| 208 | Consulting Engineers Group, Inc. | Structural engineering | 2 |
| 209 | Consulting Engineers Group, Inc. | Structural engineering | 3 |
| 210 | Consulting Structural Engineers, Inc. | Structural engineering | 2 |
| 211 | Contec Byggprojektering AB | Structural engineering | 3 |
| 212 | Conti & Jumper & Gardner | Structural engineering | 33 |
| 213 | Conway Engineering | Structural engineering | 0 |
| 214 | Cook Consulting Engineers | Structural engineering | 1 |
| 215 | Cooke-chachkes Assocs. | Structural engineering | 0 |
| 216 | Coombs Engineering, PC | Structural engineering | 0 |
| 217 | Cooper Consultants | Structural engineering | 9 |
| 218 | Cooper, Rose & Associates | Structural engineering | 3 |
| 219 | Copeland Consulting Engineers Inc | Structural engineering | 6 |
| 220 | Copeland Wedge Associates Limited | Structural engineering | 4 |