Codes Titles Number of US Businesses
54 Professional, Scientific, and Technical Services 2,024,400
541110Offices of Lawyers294,286
541120Offices of Notaries4,456
541191Title Abstract and Settlement Offices 9,358
541199All Other Legal Services 3,542
541211Offices of Certified Public Accountants 51,015
541213Tax Preparation Services 54,512
541214Payroll Services 1,855
541219Other Accounting Services 55,834
541310Architectural Services37,063
541320Landscape Architectural Services68,824
541330Engineering Services89,537
541340Drafting Services1,394
541350Building Inspection Services4,220
541360Geophysical Surveying and Mapping Services0
541370Surveying and Mapping (except Geophysical) Services11,526
541380Testing Laboratories9,560
541410Interior Design Services35,052
541420Industrial Design Services1,669
541430Graphic Design Services34,847
541490Other Specialized Design Services1,904
541511Custom Computer Programming Services 88,348
541512Computer Systems Design Services 77,020
541513Computer Facilities Management Services 1,116
541519Other Computer Related Services4,475
541611Administrative Management and General Management Consulting Services 176,155
541612Human Resources Consulting Services 11,977
541613Marketing Consulting Services 46,211
541614Process, Physical Distribution, and Logistics Consulting Services 3,029
541618Other Management Consulting Services 321,433
541620Environmental Consulting Services17,227
541690Other Scientific and Technical Consulting Services37,037
541713Research and Development in Nanotechnology 0
541714Research and Development in Biotechnology (except Nanobiotechnology)3,001
541715Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 21,600
541720Research and Development in the Social Sciences and Humanities 15,006
541810Advertising Agencies21,622
541820Public Relations Agencies15,823
541830Media Buying Agencies865
541840Media Representatives3,993
541850Outdoor Advertising2,604
541860Direct Mail Advertising5,124
541870Advertising Material Distribution Services1,238
541890Other Services Related to Advertising 10,024
541910Marketing Research and Public Opinion Polling11,398
541921Photography Studios, Portrait 72,146
541922Commercial Photography 15,832
541930Translation and Interpretation Services5,394
541940Veterinary Services 40,861
541990All Other Professional, Scientific, and Technical Services223,387