Codes Titles Number of US Businesses
54 Professional, Scientific, and Technical Services 2,049,826
541110Offices of Lawyers295,022
541120Offices of Notaries4,479
541191Title Abstract and Settlement Offices 9,455
541199All Other Legal Services 3,511
541211Offices of Certified Public Accountants 51,136
541213Tax Preparation Services 54,130
541214Payroll Services 1,904
541219Other Accounting Services 56,594
541310Architectural Services36,810
541320Landscape Architectural Services72,775
541330Engineering Services89,422
541340Drafting Services1,343
541350Building Inspection Services4,089
541360Geophysical Surveying and Mapping Services0
541370Surveying and Mapping (except Geophysical) Services11,441
541380Testing Laboratories9,582
541410Interior Design Services33,816
541420Industrial Design Services1,572
541430Graphic Design Services35,211
541490Other Specialized Design Services1,856
541511Custom Computer Programming Services 94,432
541512Computer Systems Design Services 80,185
541513Computer Facilities Management Services 1,105
541519Other Computer Related Services4,567
541611Administrative Management and General Management Consulting Services 184,750
541612Human Resources Consulting Services 12,063
541613Marketing Consulting Services 48,669
541614Process, Physical Distribution, and Logistics Consulting Services 2,934
541618Other Management Consulting Services 321,246
541620Environmental Consulting Services17,086
541690Other Scientific and Technical Consulting Services36,711
541713Research and Development in Nanotechnology 0
541714Research and Development in Biotechnology (except Nanobiotechnology)3,132
541715Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 21,538
541720Research and Development in the Social Sciences and Humanities 15,305
541810Advertising Agencies22,104
541820Public Relations Agencies15,689
541830Media Buying Agencies831
541840Media Representatives3,917
541850Outdoor Advertising2,522
541860Direct Mail Advertising4,968
541870Advertising Material Distribution Services1,149
541890Other Services Related to Advertising 10,345
541910Marketing Research and Public Opinion Polling11,412
541921Photography Studios, Portrait 78,945
541922Commercial Photography 16,115
541930Translation and Interpretation Services5,498
541940Veterinary Services 41,531
541990All Other Professional, Scientific, and Technical Services216,929