North American Industry Classification System (NAICS) Codes
| Code | NAICS Title |
| 517110 | Wired Telecommunications Carriers |
| 517919 | All Other Telecommunications |
| 518210 | Data Processing, Hosting, And Related Services |
| 541211 | Offices Of Certified Public Accountants |
| 541219 | Other Accounting Services |
| 541330 | Engineering Services |
| 541430 | Graphic Design Services |
| 541490 | Other Specialized Design Services |
| 541511 | Custom Computer Programming Services |
| 541512 | Computer Systems Design Services |
| 541513 | Computer Facilities Management Services |
| 541519 | Other Computer Related Services |
| 541611 | Administrative Management And General Management Consulting Services |
| 541612 | Human Resources Consulting Services |
| 541614 | Process, Physical Distribution, And Logistics Consulting Services |
| 541618 | Other Management Consulting Services |
| 541690 | Other Scientific And Technical Consulting Services |
| 541712 | Research And Development In The Physical, Engineering, And Life Sciences (Except Biotechnology) |
| 541720 | Research And Development In The Social Sciences And Humanities |
| 541990 | All Other Professional, Scientific, And Technical Services |
| 561110 | Office Administrative Services |
| 561210 | Facilities Support Services |
| 561499 | All Other Business Support Services |
| 561611 | Investigation Services |
| 561612 | Security Guards And Patrol Services |
| 611430 | Professional And Management Development Training |
| 621999 | All Other Miscellaneous Ambulatory Health Care Services |
