NAICS 813920:
Professional Organizations
This industry comprises establishments primarily engaged in promoting the professional interests of their members and the profession as a whole. These establishments may conduct research; develop statistics; sponsor quality and certification standards; lobby public officials; or publish newsletters, books, or periodicals for distribution to their members.
Bar associationsLearned societiesDentists' associations+5 examples
Peer review boardsEngineers' associationsProfessional standards review boardsHealth professionals' associationsScientists' associations
Matching SIC code: 8621 Professional Membership Organizations
Where it sits
- 81Other Services (except Public Administration)Sector
- 813Religious, Grantmaking, Civic, Professional, and Similar OrganizationsSubsector
- 8139Business, Professional, Labor, Political, and Similar OrganizationsIndustry group
- 81392Professional OrganizationsNAICS industry
- 813920Professional OrganizationsNational industry
Largest companies with NAICS 813920
Updated Nov 9, 2026| Rank | Company | Headquarters | Employees |
|---|---|---|---|
| 1 |  IEEEieee.org | Piscataway, US | 16K |
| 2 |  YPOypo.org | Irving, US | 11K |
| 3 |  Project Management Institutepmi.org | US | 6.4K |
| 4 |  FINRAfinra.org | Washington, US | 6.2K |
| 5 |  American Bar Associationamericanbar.org | Chicago, US | 4.4K |
| 6 |  American Psychological Associationapa.org | Washington, US | 4.4K |
| 7 |  Broadcast Music, Inc. (BMI)bmi.com | New York, US | 4.2K |
| 8 |  SMEsme.org | Southfield, US | 3.4K |
| 9 |  ASME (The American Society of Mechanical Engineers)asme.org | New York, US | 3.3K |
| 10 |  Association of International Certified Professional Accountantsaicpa-cima.com | Durham, US | 3.2K |
Not this code?
Similar activities the Census classifies elsewhere.
- 541820Public Relations AgenciesLobbying public officials (i.e., lobbyists)
Questions about NAICS 813920
Which businesses use NAICS 813920?
Bar associations, learned societies and dentists' associations, and similar businesses in the Other Services (except Public Administration) sector. This industry comprises establishments primarily engaged in promoting the professional interests of their members and the profession as a whole.
What SIC code matches NAICS 813920?
SIC 8621, Professional Membership Organizations, from the US Census Bureau's concordance between the two systems.
How many companies have NAICS 813920?
41,674 companies with a website carry NAICS 813920 as their primary code in Crustdata's data, worldwide.
Find any company's NAICS codeType a company name or website and get its codes with their titles.
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Sign up freeCode titles, definitions, examples and SIC matches: NAICS 2022 and the Census concordances, US Census Bureau. Company counts and lists: Crustdata, companies with a website, each by its primary code, updated weekly. Employee counts are estimates.