| 2007 NAICS | 2012 NAICS | 2017 NAICS | Corresponding Index Entries | |||
| 541330 | 541330 | 541330 | Acoustical engineering consulting services | |||
| 541330 | 541330 | 541330 | Acoustical system engineering design services | |||
| 541330 | 541330 | 541330 | Boat engineering design services | |||
| 541330 | 541330 | 541330 | Chemical engineering services | |||
| 541330 | 541330 | 541330 | Civil engineering services | |||
| 541330 | 541330 | 541330 | Combustion engineering consulting services | |||
| 541330 | 541330 | 541330 | Construction engineering services | |||
| 541330 | 541330 | 541330 | Consulting engineers' offices | |||
| 541330 | 541330 | 541330 | Consulting engineers' private practices | |||
| 541330 | 541330 | 541330 | Electrical engineering services | |||
| 541330 | 541330 | 541330 | Engineering consulting services | |||
| 541330 | 541330 | 541330 | Engineering design services | |||
| 541330 | 541330 | 541330 | Engineering services | |||
| 541330 | 541330 | 541330 | Engineers' offices | |||
| 541330 | 541330 | 541330 | Engineers' private practices | |||
| 541330 | 541330 | 541330 | Environmental engineering services | |||
| 541330 | 541330 | 541330 | Erosion control engineering services | |||
| 541330 | 541330 | 541330 | Geological engineering services | |||
| 541330 | 541330 | 541330 | Geophysical engineering services | |||
| 541330 | 541330 | 541330 | Heating engineering consulting services | |||
| 541330 | 541330 | 541330 | Industrial engineering services | |||
| 541330 | 541330 | 541330 | Logging engineering services | |||
| 541330 | 541330 | 541330 | Marine engineering services | |||
| 541330 | 541330 | 541330 | Maritime technology engineering services | |||
| 541330 | 541330 | 541330 | Mechanical engineering services | |||
| 541330 | 541330 | 541330 | Mining engineering services | |||
| 541330 | 541330 | 541330 | Petroleum engineering services | |||
| 541330 | 541330 | 541330 | Traffic engineering consulting services |