Codes Titles Number of US Businesses
54 Professional, Scientific, and Technical Services 2,040,346
541110Offices of Lawyers291,196
541120Offices of Notaries4,375
541191Title Abstract and Settlement Offices 9,260
541199All Other Legal Services 3,524
541211Offices of Certified Public Accountants 50,789
541213Tax Preparation Services 54,060
541214Payroll Services 1,855
541219Other Accounting Services 55,389
541310Architectural Services36,860
541320Landscape Architectural Services71,146
541330Engineering Services89,668
541340Drafting Services1,370
541350Building Inspection Services4,168
541360Geophysical Surveying and Mapping Services0
541370Surveying and Mapping (except Geophysical) Services11,392
541380Testing Laboratories9,500
541410Interior Design Services34,554
541420Industrial Design Services1,638
541430Graphic Design Services34,904
541490Other Specialized Design Services1,923
541511Custom Computer Programming Services 90,573
541512Computer Systems Design Services 77,776
541513Computer Facilities Management Services 1,112
541519Other Computer Related Services4,542
541611Administrative Management and General Management Consulting Services 182,010
541612Human Resources Consulting Services 11,972
541613Marketing Consulting Services 46,309
541614Process, Physical Distribution, and Logistics Consulting Services 2,993
541618Other Management Consulting Services 325,317
541620Environmental Consulting Services17,128
541690Other Scientific and Technical Consulting Services37,019
541713Research and Development in Nanotechnology 0
541714Research and Development in Biotechnology (except Nanobiotechnology)3,043
541715Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 21,662
541720Research and Development in the Social Sciences and Humanities 15,057
541810Advertising Agencies21,582
541820Public Relations Agencies15,684
541830Media Buying Agencies850
541840Media Representatives3,950
541850Outdoor Advertising2,575
541860Direct Mail Advertising5,038
541870Advertising Material Distribution Services1,211
541890Other Services Related to Advertising 10,018
541910Marketing Research and Public Opinion Polling11,416
541921Photography Studios, Portrait 75,312
541922Commercial Photography 16,021
541930Translation and Interpretation Services5,442
541940Veterinary Services 40,993
541990All Other Professional, Scientific, and Technical Services226,170