- Engineering services (3704)
- Architectural services (1746)
- Surveying services (494)
- Accounting, auditing, and bookkeeping (6180)
- Commercial physical research (1003)
- Commercial nonphysical research (818)
- Noncommercial research organizations (527)
- Testing laboratories (568)
- Management services (4505)
- Management consulting services (10187)
- Public relations services (1027)
- Facilities support services (227)
- Business consulting, nec (11041)