| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | C & S arkitekter ab | Architect | 2 |
| 2 | C & S Engineers Inc | Architect | 3 |
| 3 | C A Associates | Architect | 1 |
| 4 | C A Dahlke RA | Architect | 1 |
| 5 | C A Decker | Architect | 0 |
| 6 | C A P S Architect | Architect | 18 |
| 7 | C Allan Anderson Architect PA | Architect | 1 |
| 8 | C Barbu Co Architects | Architect | 1 |
| 9 | C C Koehler Architects | Architect | 1 |
| 10 | C D Construction Consulting | Architect | 1 |
| 11 | C D Design Inc | Architect | 2 |
| 12 | C F C Corp | Architect | 0 |
| 13 | C Gayle Zembower Architect Inc. | Architect | 2 |
| 14 | C H Guernsey & Co. | Architect | 1 |
| 15 | C H-m S Architects | Architect | 0 |
| 16 | C K Dennis Architect | Architect | 1 |
| 17 | C Lewis Tomaselli Architects | Architect | 1 |
| 18 | C M S S Architects | Architect | 2 |
| 19 | C N Söderberg | Architect | 2 |
| 20 | C P A A | Architect | 1 |