Subsector 541 - Professional, Scientific and Technical Services
541110
 Offices of Lawyers
541191
 Title Abstract and Settlement Offices
541199
 All Other Legal Services
541211
 Offices of Certified Public Accountants
541213
 Tax Preparation Services
541214
 Payroll Services
541219
 Other Accounting Services
541310
 Architectural Services
541320
 Landscape Architectural Services
541330
 Engineering Services
Except,  Military and Aerospace Equipment and Military Weapons
Except,  Contracts and Subcontracts for Engineering Services Awarded Under the National Energy Policy Act of 1992
Except,  Marine Engineering and Naval Architecture
541340
 Drafting Services
Except,  Map Drafting
541350
 Building Inspection Services
541360
 Geophysical Surveying and Mapping Services
541370
 Surveying and Mapping (except Geophysical) Services
541380
 Testing Laboratories
541410
 Interior Design Services
541420
 Industrial Design Services
541430
 Graphic Design Services
541490
 Other Specialized Design Services
541511
 Custom Computer Programming Services
541512
 Computer Systems Design Services
541513
 Computer Facilities Management Services
541519
 Other Computer Related Services
Except,  Information Technology Value Added Resellers  
541611
 Administrative Management and General Management Consulting Services
541612
 Human Resources and Executive Search Consulting Services
541613
 Marketing Consulting Services
541614
 Process, Physical Distribution and Logistics Consulting Services
541618
 Other Management Consulting Services
541620
 Environmental Consulting Services
541690
 Other Scientific and Technical Consulting Services
541710
 Research and Development in the Physical, Engineering, and Life Sciences 
Except,  Aircraft
Except,  Aircraft Parts, and Auxiliary Equipment, and Aircraft Engine Parts
Except,  Space Vehicles and Guided Missiles, their Propulsion Units, their Propulsion Units Parts, and their Auxiliary Equipment and Parts
541720
 Research and Development in the Social Sciences and Humanities
541810
 Advertising Agencies 
541820
 Public Relations Agencies
541830
 Media Buying Agencies
541840
 Media Representatives
541850
 Display Advertising
541860
 Direct Mail Advertising
541870
 Advertising Material Distribution Services
541890
 Other Services Related to Advertising
541910
 Marketing Research and Public Opinion Polling
541921
 Photography Studios, Portrait
541922
 Commercial Photography
541930
 Translation and Interpretation Services
541940
 Veterinary Services
541990
 All Other Professional, Scientific and Technical Services