- 541211 â Offices of Certified Accountants
- 541330 â Engineering Services
- 541511 â Custom Computer Programming Services
- 541512 â Computer Systems Design Services
- 541513 â Computer Facilities Management Services
- 541519 â Other Computer Related Services
- 541611 â Administrative Management and General Management Consulting
- 541618 â Other Management Consulting Services
- 541690 â Other Scientific and Technical Consulting Services
- 541711 â Research and Development in Biotechnology
- 541712 â Research and Development in the Physical, Engineering, and Life Sciences
- 541990 â All Other Professional, Scientific, and Technical Services
- 561210 â Facilities Support Services
- 621111 â Offices of Physicians (except Mental Health Specialists
- 621112 â Offices of Physicians, Mental Health Specialists
- 621399 â Offices of All Other Misc Health Practitioners