Codes Titles Number of US Businesses
54 Professional, Scientific, and Technical Services 2,048,008
541110Offices of Lawyers296,284
541120Offices of Notaries4,636
541191Title Abstract and Settlement Offices 9,415
541199All Other Legal Services 3,549
541211Offices of Certified Public Accountants 52,773
541213Tax Preparation Services 55,230
541214Payroll Services 1,863
541219Other Accounting Services 57,247
541310Architectural Services37,351
541320Landscape Architectural Services69,241
541330Engineering Services90,142
541340Drafting Services1,454
541350Building Inspection Services4,368
541360Geophysical Surveying and Mapping Services0
541370Surveying and Mapping (except Geophysical) Services11,512
541380Testing Laboratories9,638
541410Interior Design Services35,705
541420Industrial Design Services1,723
541430Graphic Design Services35,410
541490Other Specialized Design Services1,906
541511Custom Computer Programming Services 85,555
541512Computer Systems Design Services 76,816
541513Computer Facilities Management Services 1,094
541519Other Computer Related Services4,368
541611Administrative Management and General Management Consulting Services 178,474
541612Human Resources Consulting Services 11,997
541613Marketing Consulting Services 44,653
541614Process, Physical Distribution, and Logistics Consulting Services 3,049
541618Other Management Consulting Services 327,764
541620Environmental Consulting Services17,290
541690Other Scientific and Technical Consulting Services37,518
541711Research and Development in Biotechnology 2,893
541712Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 21,855
541720Research and Development in the Social Sciences and Humanities 14,799
541810Advertising Agencies21,778
541820Public Relations Agencies15,946
541830Media Buying Agencies892
541840Media Representatives4,029
541850Outdoor Advertising2,565
541860Direct Mail Advertising5,228
541870Advertising Material Distribution Services1,249
541890Other Services Related to Advertising 10,115
541910Marketing Research and Public Opinion Polling11,561
541921Photography Studios, Portrait 71,943
541922Commercial Photography 16,090
541930Translation and Interpretation Services5,405
541940Veterinary Services 40,988
541990All Other Professional, Scientific, and Technical Services232,647