- Engineering services (1843)
- Architectural services (708)
- Surveying services (360)
- Accounting, auditing, and bookkeeping (2300)
- Commercial physical research (393)
- Commercial nonphysical research (278)
- Noncommercial research organizations (257)
- Testing laboratories (268)
- Management services (1523)
- Management consulting services (4065)
- Public relations services (425)
- Facilities support services (57)
- Business consulting, nec (4067)