Codes Titles Number of US Businesses
54 Professional, Scientific, and Technical Services 2,089,391
541110Offices of Lawyers306,724
541120Offices of Notaries5,457
541191Title Abstract and Settlement Offices 10,977
541199All Other Legal Services 3,593
541211Offices of Certified Public Accountants 60,599
541213Tax Preparation Services 58,868
541214Payroll Services 2,592
541219Other Accounting Services 50,518
541310Architectural Services37,456
541320Landscape Architectural Services76,191
541330Engineering Services90,434
541340Drafting Services1,305
541350Building Inspection Services7,175
541360Geophysical Surveying and Mapping Services0
541370Surveying and Mapping (except Geophysical) Services11,299
541380Testing Laboratories9,529
541410Interior Design Services34,818
541420Industrial Design Services1,891
541430Graphic Design Services35,248
541490Other Specialized Design Services1,811
541511Custom Computer Programming Services 96,372
541512Computer Systems Design Services 81,036
541513Computer Facilities Management Services 1,087
541519Other Computer Related Services4,796
541611Administrative Management and General Management Consulting Services 183,219
541612Human Resources Consulting Services 13,002
541613Marketing Consulting Services 49,048
541614Process, Physical Distribution, and Logistics Consulting Services 2,980
541618Other Management Consulting Services 315,446
541620Environmental Consulting Services19,521
541690Other Scientific and Technical Consulting Services38,997
541713Research and Development in Nanotechnology 0
541714Research and Development in Biotechnology (except Nanobiotechnology)3,823
541715Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 20,991
541720Research and Development in the Social Sciences and Humanities 14,548
541810Advertising Agencies22,203
541820Public Relations Agencies15,893
541830Media Buying Agencies833
541840Media Representatives3,866
541850Outdoor Advertising2,563
541860Direct Mail Advertising4,879
541870Advertising Material Distribution Services1,152
541890Other Services Related to Advertising 10,454
541910Marketing Research and Public Opinion Polling12,930
541921Photography Studios, Portrait 83,607
541922Commercial Photography 16,170
541930Translation and Interpretation Services5,486
541940Veterinary Services 42,778
541990All Other Professional, Scientific, and Technical Services215,226