| # | Company name | Role | # of projects |
|---|---|---|---|
| 181 | Complete Project Solutions | Structural engineering | 1 |
| 182 | Comprehensive Design | Structural engineering | 0 |
| 183 | Computerized Engineering Inc. | Structural engineering | 1 |
| 184 | Concept Engineers | Structural engineering | 3 |
| 185 | Concept Engineers, Inc. | Structural engineering | 7 |
| 186 | Concorde Consulting Group | Structural engineering | 1 |
| 187 | Concrete Steel Company | Structural engineering | 2 |
| 188 | Condron & Co. | Structural engineering | 3 |
| 189 | Congdon Engineering Associates, Inc. | Structural engineering | 1 |
| 190 | Conlee Engineers Inc. | Structural engineering | 4 |
| 191 | Connell Wagner (Thailand) Co Ltd | Structural engineering | 8 |
| 192 | Connell Wagner Pty Ltd | Structural engineering | 12 |
| 193 | Conrad Engineering | Structural engineering | 1 |
| 194 | Conrad Pohlmann PE Consulting Engineers | Structural engineering | 1 |
| 195 | Considère, Pelnard & Lossier | Structural engineering | 1 |
| 196 | Construcorp | Structural engineering | 3 |
| 197 | Constructie-adviesbureau S3 | Structural engineering | 12 |
| 198 | Constructie-Adviesburo Steens | Structural engineering | 6 |
| 199 | Constructiebureau De Prouw BV | Structural engineering | 0 |
| 200 | Constructiebureau Maaskant | Structural engineering | 2 |