| Naics index | Naics index description |
|---|---|
| 541330 | Construction engineering services |
| 541330 | Consulting engineers' offices |
| 541330 | Consulting engineers' private practices |
| 541330 | Electrical engineering services |
| 541330 | Engineering consulting services |
| 541330 | Engineering design services |
| 541330 | Engineering services |
| 541330 | Engineers' offices |
| 541330 | Engineers' private practices |
| 541330 | Environmental engineering services |