Company lists · Data refreshed September 2026

Top 25 Professional associations worldwide

Name: Professional associations worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 5,499 companies tracked

RevenueBase identified 5,499 professional associations worldwide as of September 2026 and tracks 98,796 professional contacts across them, including 17,468 with verified work emails. The United States is the largest market and Paris the largest hub.

This list covers professional associations worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026. Country and city lists for professional associations follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

5,499Companies

98,796Contacts tracked

17,468Verified emails

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The 25 largest professional associations worldwide

Ranked by team size

Top 25 of 5,499 professional associations worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to professional associations: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	OAB SP	Indirect evidence	São Paulo, BrazilHQ checked Sep 20, 2026	1,001-5,000	5,273 contacts →
	Indirect evidence “Fundada em 1932, a OAB SP nasceu para apoiar e defender os advogados e advogadas paulistas.” Source: RevenueBase Database · checked Sep 20, 2026
2	General Medical Council	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	1,870 contacts →
	Indirect evidence “We work with doctors, physician associates (PAs), anaesthesia associates (AAs), those they care for and other stakeholders to support good, safe patient care across the UK.” Source: RevenueBase Database · checked Sep 20, 2026
3	Chartered Accountants Australia And NEW Zealand	Partial evidence	Sydney, AustraliaHQ checked Sep 20, 2026	201-500	1,371 contacts →
	Partial evidence “Chartered Accountants Australia and New Zealand represents more than financial professionals, supporting them to make a difference to the businesses, organisations and communities…” Source: RevenueBase Database · checked Sep 20, 2026
4	CPA Australia	Indirect evidence	Southbank, AustraliaHQ checked Sep 20, 2026	201-500	1,240 contacts →
	Indirect evidence “Our core services to members include education, training, technical support and advocacy.” Source: RevenueBase Database · checked Sep 20, 2026
5	American Dental Association	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	1,154 contacts →
	Partial evidence “The not-for-profit American Dental Association (ADA) is America's leading advocate for oral health.” Source: RevenueBase Database · checked Sep 20, 2026
6	Health Care Compliance Association Hcca	Strong evidence	Eden Prairie, MN, United StatesHQ checked Sep 20, 2026	n/a	1,036 contacts →
	Strong evidence “Established in 1996, Health Care Compliance Association® (HCCA)® supports healthcare compliance professionals as part of the overarching mission of SCCE & HCCA, a professional…” Source: RevenueBase Database · checked Sep 20, 2026
7	Associated Builders And Contractors	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	n/a	960 contacts →
	Indirect evidence “Founded on the merit shop philosophy, ABC and its 67 chapters nationwide help our members develop people, win work and deliver that work safely, ethically and profitably for the…” Source: RevenueBase Database · checked Sep 20, 2026
8	Medical Protection Society	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	786 contacts →
	Partial evidence “The Medical Protection Society Limited (“MPS”) is the world’s leading protection organisation for doctors, dentists and healthcare professionals.” Source: RevenueBase Database · checked Sep 20, 2026
9	CPA Ontario	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 20, 2026	201-500	737 contacts →
	Indirect evidence “We protect the public.” Source: RevenueBase Database · checked Sep 20, 2026
10	Professional Photographers Of America	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 20, 2026	n/a	666 contacts →
	Strong evidence “Professional Photographers of America (PPA) is the world's largest nonprofit association serving professional photographers.” Source: RevenueBase Database · checked Sep 20, 2026
11	OAB RS	Indirect evidence	Porto Alegre, BrazilHQ checked Sep 20, 2026	501-1,000	648 contacts →
	Indirect evidence “Essa é a página oficial da OAB/RS.” Source: RevenueBase Database · checked Sep 20, 2026
12	Avant Mutual	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	501-1,000	631 contacts →
	Indirect evidence “Avant Mutual is Australia's leading doctors’ mutual.” Source: RevenueBase Database · checked Sep 20, 2026
13	Turkiye Noterler Birligi	Indirect evidence	Çankaya, TürkiyeHQ checked Sep 20, 2026	201-500	611 contacts →
	Indirect evidence “Türkiye Noterler Birliği, Anayasanın 135.” Source: RevenueBase Database · checked Sep 20, 2026
14	IL Lustre COL Legi DE L'advocacia DE Barcelona Icab	Indirect evidence	Barcelona, SpainHQ checked Sep 20, 2026	51-200	598 contacts →
	Indirect evidence “El Ilustre Colegio de Abogados de Barcelona (ICAB) es una institución que trabaja para defender la profesión de abogado y la promoción de la imagen de la abogacía dentro de la…” Source: RevenueBase Database · checked Sep 20, 2026
15	Royal College Of Physicians And Surgeons Of Canada	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	201-500	572 contacts →
	Indirect evidence “Our vision: Advancing learning for specialist physicians to deliver the best health care for all.” Source: RevenueBase Database · checked Sep 20, 2026
16	MDRT	Strong evidence	Park Ridge, IL, United StatesHQ checked Sep 20, 2026	51-200	552 contacts →
	Strong evidence “MDRT (Million Dollar Round Table), The Premier Association of Financial Professionals®, is a global, independent association of the world's leading life insurance and financial…” Source: RevenueBase Database · checked Sep 20, 2026
17	Executive Director, INC	Strong evidence	Milwaukee, WI, United StatesHQ checked Sep 20, 2026	201-500	543 contacts →
	Strong evidence “EDI is a top company in association management, providing professional services for national and international medical, certification, and scientific associations.” Source: RevenueBase Database · checked Sep 20, 2026
18	OABRJ	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 20, 2026	501-1,000	520 contacts →
	Indirect evidence “Perfil oficial da OABRJ Advocacia valorizada, cidadania respeitada.” Source: RevenueBase Database · checked Sep 20, 2026
19	Doctors Of BC	Indirect evidence	Vancouver, CanadaHQ checked Sep 20, 2026	201-500	511 contacts →
	Indirect evidence “At Doctors of BC, we make a meaningful difference in improving health care for British Columbians by working alongside our physician members to achieve quality patient care…” Source: RevenueBase Database · checked Sep 20, 2026
20	OAB BA	Partial evidence	Salvador, BrazilHQ checked Sep 20, 2026	10001+	506 contacts →
	Partial evidence “The Brazilian Bar Association (OAB) was created in 1930, by virtue of a presidential decree, to assist the attorney class.” Source: RevenueBase Database · checked Sep 20, 2026
21	Avma American Veterinary Medical Association	Partial evidence	Schaumburg, IL, United StatesHQ checked Sep 20, 2026	51-200	492 contacts →
	Partial evidence “The AVMA is the nation’s leading advocate for the veterinary profession.” Source: RevenueBase Database · checked Sep 20, 2026
22	Public Relations Society Of America Prsa	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	n/a	491 contacts →
	Indirect evidence “PRSA is where communicators stay ahead of what's actually landing on our desks: AI, crisis, misinformation, and reputation management.” Source: RevenueBase Database · checked Sep 20, 2026
23	Ordem DOS Advogados Portugueses	Indirect evidence	Lisbon, PortugalHQ checked Sep 20, 2026	51-200	488 contacts →
	Indirect evidence “A Ordem dos Advogados é a associação pública representativa dos profissionais que exercem a advocacia.” Source: RevenueBase Database · checked Sep 20, 2026
24	V&vn Verpleegkundigen & Verzorgenden Nederland	Indirect evidence	Utrecht, NetherlandsHQ checked Sep 20, 2026	51-200	475 contacts →
	Indirect evidence “V & VN staat voor Verpleegkundigen & Verzorgenden Nederland.” Source: RevenueBase Database · checked Sep 20, 2026
25	Barreau DE Bruxelles	Indirect evidence	Bruxelles, BelgiumHQ checked Sep 20, 2026	n/a	449 contacts →
	Indirect evidence “Ordre français des avocats du barreau de Bruxelles” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: professional associations. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names professional associations.
Partial evidence: Its own public description names part of professional associations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name professional associations. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 5,499 professional associations worldwide

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Professional associations worldwide at a glance

As of Sep 20, 2026

17.7%Verified-email coverage

18.0Average contacts per company

1-10Median size (employees)

2.5%Largest-city concentration · Paris

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

2,792

11-50

1,294

51-200

658

201-500

288

501-1,000

173

1,001-5,000

166

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among professional associations, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for professional associations are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “professional associations”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names professional associations), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among professional associations, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 17,468 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Professional associations by location

19 lists · largest first

Every Professional associations list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names professional associations, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many professional associations are there worldwide?

RevenueBase identified 5,499 professional associations worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

OAB SP, headquartered in Sao Paulo, tops this list with the largest team on record.

Which country has the most professional associations?

The United States leads with 1,494 companies, followed by France (346) and Canada (251). Every professional associations list by country and city is linked on this page.

Which city has the most professional associations?

Paris leads with 140 headquartered companies, followed by London (74) and Madrid (60).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 17,468 verified decision-maker contacts tracked across these 5,499 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.