- Engineering services (1469)
- Architectural services (807)
- Surveying services (332)
- Accounting, auditing, and bookkeeping (2719)
- Commercial physical research (640)
- Commercial nonphysical research (598)
- Noncommercial research organizations (155)
- Testing laboratories (149)
- Management services (1990)
- Management consulting services (2645)
- Public relations services (876)
- Facilities support services (9)
- Business consulting, nec (2657)