| Codes |
Titles
|
Number of US Businesses |
| 54 |
Professional, Scientific, and Technical Services |
2,024,400 |
| 541110 | Offices of Lawyers | 294,286 |
| 541120 | Offices of Notaries | 4,456 |
| 541191 | Title Abstract and Settlement Offices | 9,358 |
| 541199 | All Other Legal Services | 3,542 |
| 541211 | Offices of Certified Public Accountants | 51,015 |
| 541213 | Tax Preparation Services | 54,512 |
| 541214 | Payroll Services | 1,855 |
| 541219 | Other Accounting Services | 55,834 |
| 541310 | Architectural Services | 37,063 |
| 541320 | Landscape Architectural Services | 68,824 |
| 541330 | Engineering Services | 89,537 |
| 541340 | Drafting Services | 1,394 |
| 541350 | Building Inspection Services | 4,220 |
| 541360 | Geophysical Surveying and Mapping Services | 0 |
| 541370 | Surveying and Mapping (except Geophysical) Services | 11,526 |
| 541380 | Testing Laboratories | 9,560 |
| 541410 | Interior Design Services | 35,052 |
| 541420 | Industrial Design Services | 1,669 |
| 541430 | Graphic Design Services | 34,847 |
| 541490 | Other Specialized Design Services | 1,904 |
| 541511 | Custom Computer Programming Services | 88,348 |
| 541512 | Computer Systems Design Services | 77,020 |
| 541513 | Computer Facilities Management Services | 1,116 |
| 541519 | Other Computer Related Services | 4,475 |
| 541611 | Administrative Management and General Management Consulting Services | 176,155 |
| 541612 | Human Resources Consulting Services | 11,977 |
| 541613 | Marketing Consulting Services | 46,211 |
| 541614 | Process, Physical Distribution, and Logistics Consulting Services | 3,029 |
| 541618 | Other Management Consulting Services | 321,433 |
| 541620 | Environmental Consulting Services | 17,227 |
| 541690 | Other Scientific and Technical Consulting Services | 37,037 |
| 541713 | Research and Development in Nanotechnology | 0 |
| 541714 | Research and Development in Biotechnology (except Nanobiotechnology) | 3,001 |
| 541715 | Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) | 21,600 |
| 541720 | Research and Development in the Social Sciences and Humanities | 15,006 |
| 541810 | Advertising Agencies | 21,622 |
| 541820 | Public Relations Agencies | 15,823 |
| 541830 | Media Buying Agencies | 865 |
| 541840 | Media Representatives | 3,993 |
| 541850 | Outdoor Advertising | 2,604 |
| 541860 | Direct Mail Advertising | 5,124 |
| 541870 | Advertising Material Distribution Services | 1,238 |
| 541890 | Other Services Related to Advertising | 10,024 |
| 541910 | Marketing Research and Public Opinion Polling | 11,398 |
| 541921 | Photography Studios, Portrait | 72,146 |
| 541922 | Commercial Photography | 15,832 |
| 541930 | Translation and Interpretation Services | 5,394 |
| 541940 | Veterinary Services | 40,861 |
| 541990 | All Other Professional, Scientific, and Technical Services | 223,387 |