Codes Titles Number of US Businesses
54 Professional, Scientific, and Technical Services 2,088,551
541110Offices of Lawyers306,633
541120Offices of Notaries4,605
541191Title Abstract and Settlement Offices 9,718
541199All Other Legal Services 3,624
541211Offices of Certified Public Accountants 59,580
541213Tax Preparation Services 55,309
541214Payroll Services 2,621
541219Other Accounting Services 50,313
541310Architectural Services37,661
541320Landscape Architectural Services75,600
541330Engineering Services90,626
541340Drafting Services1,329
541350Building Inspection Services6,997
541360Geophysical Surveying and Mapping Services0
541370Surveying and Mapping (except Geophysical) Services11,442
541380Testing Laboratories9,655
541410Interior Design Services35,413
541420Industrial Design Services1,925
541430Graphic Design Services35,609
541490Other Specialized Design Services1,840
541511Custom Computer Programming Services 95,409
541512Computer Systems Design Services 81,018
541513Computer Facilities Management Services 1,089
541519Other Computer Related Services4,753
541611Administrative Management and General Management Consulting Services 184,562
541612Human Resources Consulting Services 13,181
541613Marketing Consulting Services 49,600
541614Process, Physical Distribution, and Logistics Consulting Services 3,001
541618Other Management Consulting Services 317,910
541620Environmental Consulting Services19,795
541690Other Scientific and Technical Consulting Services39,605
541713Research and Development in Nanotechnology 0
541714Research and Development in Biotechnology (except Nanobiotechnology)3,810
541715Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 21,254
541720Research and Development in the Social Sciences and Humanities 14,792
541810Advertising Agencies22,342
541820Public Relations Agencies16,284
541830Media Buying Agencies835
541840Media Representatives3,898
541850Outdoor Advertising2,604
541860Direct Mail Advertising4,976
541870Advertising Material Distribution Services1,158
541890Other Services Related to Advertising 10,543
541910Marketing Research and Public Opinion Polling11,609
541921Photography Studios, Portrait 83,029
541922Commercial Photography 16,309
541930Translation and Interpretation Services5,495
541940Veterinary Services 42,390
541990All Other Professional, Scientific, and Technical Services216,800