| # | Company name | Role | # of projects |
|---|---|---|---|
| 241 | Crawinkler Luth Inc | Structural engineering | 0 |
| 242 | Creegan & D'Angelo | Structural engineering | 5 |
| 243 | Cronheim & Weger | Structural engineering | 3 |
| 244 | Cronin Engineering Inc | Structural engineering | 1 |
| 245 | Crosby & Assocs | Structural engineering | 2 |
| 246 | Crosier Kilgour & Partners Ltd. | Structural engineering | 15 |
| 247 | Crosier, Greenberg & Partners | Structural engineering | 6 |
| 248 | Cross Engineering | Structural engineering | 0 |
| 249 | Crouse & Partners | Structural engineering | 3 |
| 250 | CS Associates, Inc. | Structural engineering | 95 |
| 251 | CS Structural Engineering Inc. | Structural engineering | 2 |
| 252 | CS2 Design Group LLC | Structural engineering | 1 |
| 253 | CSA Consulting Engineers | Structural engineering | 0 |
| 254 | CSA Engineering | Structural engineering | 1 |
| 255 | CSCPE Structural Engineers | Structural engineering | 3 |
| 256 | CSE | Structural engineering | 1 |
| 257 | Cse Engineers | Structural engineering | 1 |
| 258 | CT Engineering | Structural engineering | 8 |
| 259 | CTE S.A. | Structural engineering | 3 |
| 260 | CTL Engineering | Structural engineering | 9 |