- Engineering services (2855)
- Architectural services (1305)
- Surveying services (859)
- Accounting, auditing, and bookkeeping (4483)
- Commercial physical research (891)
- Commercial nonphysical research (543)
- Noncommercial research organizations (556)
- Testing laboratories (407)
- Management services (3733)
- Management consulting services (7257)
- Public relations services (643)
- Facilities support services (163)
- Business consulting, nec (9284)