Company lists · Data refreshed September 2026

Top 25 Membership organizations worldwide

Name: Membership organizations worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 4,408 companies tracked

RevenueBase identified 4,408 membership organizations worldwide as of September 2026 and tracks 59,554 professional contacts across them, including 10,691 with verified work emails. The United States is the largest market and London the largest hub.

This list covers membership organizations 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 membership organizations 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

4,408Companies

59,554Contacts tracked

10,691Verified emails

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The 25 largest membership organizations worldwide

Ranked by team size

Top 25 of 4,408 membership organizations worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to membership organizations: 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	AAA	Indirect evidence	Coppell, TX, United StatesHQ checked Sep 20, 2026	5,001-10,000	12,030 contacts →
	Indirect evidence “Our mission is to Save Lives, Create Member Value and Deliver Exceptional Experiences.” Source: RevenueBase Database · checked Sep 20, 2026
2	RAC WA	Indirect evidence	West Perth, AustraliaHQ checked Sep 20, 2026	1,001-5,000	1,388 contacts →
	Indirect evidence “At RAC we offer career opportunities that will allow you to give back and make a difference to our members and the WA community.” Source: RevenueBase Database · checked Sep 20, 2026
3	Meeting Professionals International	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 20, 2026	n/a	1,080 contacts →
	Indirect evidence “Meeting Professionals International (MPI) is the largest meeting and event industry association worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
4	PKF - Australia	Indirect evidence	Melbourne, AustraliaHQ checked Sep 20, 2026	501-1,000	1,005 contacts →
	Indirect evidence “PKF is a global community where dynamic business and wealth advisors can belong, grow, and thrive.” Source: RevenueBase Database · checked Sep 20, 2026
5	COCA	Indirect evidence	Edmotnon, AB, CanadaHQ checked Sep 20, 2026	n/a	966 contacts →
	Indirect evidence “The Canadian Organization of Campus Activities, better known by its acronym COCA, repre-sents more than 60 post-secondary institutions from Vancouver to St.” Source: RevenueBase Database · checked Sep 20, 2026
6	Smithbucklin	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	501-1,000	720 contacts →
	Indirect evidence “Associations help industries, fields and professions stay current and connected for the members and communities who depend on them.” Source: RevenueBase Database · checked Sep 20, 2026
7	U.S. Chamber Of Commerce	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	501-1,000	693 contacts →
	Indirect evidence “The Chamber of Commerce of the United States is the world’s largest business organization.” Source: RevenueBase Database · checked Sep 20, 2026
8	DOC Servizi	Indirect evidence	Verona, ItalyHQ checked Sep 20, 2026	5,001-10,000	632 contacts →
	Indirect evidence “Doc Servizi unisce tutti coloro che condividono l'amore per l'arte, lo spettacolo, la cultura, il benessere e la conoscenza.” Source: RevenueBase Database · checked Sep 20, 2026
9	Sicoob Credicom	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 20, 2026	501-1,000	622 contacts →
	Indirect evidence “Olá!” Source: RevenueBase Database · checked Sep 20, 2026
10	Genoverband E.V	Indirect evidence	Neu-isenburg, GermanyHQ checked Sep 20, 2026	1,001-5,000	598 contacts →
	Indirect evidence “Wir sind Wirtschaftsprüfungs, Betreuungs- und Beratungsverband für rund 2.600 Genossenschaften in 14 Bundesländern.” Source: RevenueBase Database · checked Sep 20, 2026
11	Executive Director, INC	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 20, 2026	201-500	543 contacts →
	Indirect 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
12	Universo AGV	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 20, 2026	201-500	528 contacts →
	Indirect evidence “Orgulho em ser associação.” Source: RevenueBase Database · checked Sep 20, 2026
13	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
14	Aiga Design	Strong evidence	New York, NY, United StatesHQ checked Sep 20, 2026	n/a	422 contacts →
	Strong evidence “As the profession’s oldest and largest professional membership organization for design-with 72 chapters and more than members-we advance design as a professional craft, strategic…” Source: RevenueBase Database · checked Sep 20, 2026
15	Naylor Association Solutions Naylor, LLC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 20, 2026	201-500	384 contacts →
	Indirect evidence “Naylor Association Solutions empowers associations to achieve success through innovative association tools and services for strengthening member engagement and increasing non-dues…” Source: RevenueBase Database · checked Sep 20, 2026
16	ICSC	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	375 contacts →
	Indirect evidence “ICSC is the member organization for the advancement of the Marketplaces Industry.” Source: RevenueBase Database · checked Sep 20, 2026
17	Rede Construir	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 20, 2026	1,001-5,000	304 contacts →
	Indirect evidence “A Rede Construir é uma rede associativa do ramo do varejo de material de construção, que busca através da união de iniciativas, troca de experiências e boas práticas…” Source: RevenueBase Database · checked Sep 20, 2026
18	BNA	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 20, 2026	n/a	254 contacts →
	Indirect evidence “Our mission is to strengthen architectural firms that add value to client and society on promising markets.” Source: RevenueBase Database · checked Sep 20, 2026
19	Music Business Association	Strong evidence	Nashville, TN, United StatesHQ checked Sep 20, 2026	n/a	250 contacts →
	Strong evidence “The Music Business Association (Music Biz) is a non-profit membership organization that advances and promotes music commerce, a community committed to the full spectrum of…” Source: RevenueBase Database · checked Sep 20, 2026
20	Events Industry Council	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	10001+	249 contacts →
	Indirect evidence “The Events Industry Council (EIC)’s more than 30 member organizations represent more than 103,500 individuals and 19,500 firms and properties involved in the meetings, conventions…” Source: RevenueBase Database · checked Sep 20, 2026
21	socialmedia.org	Strong evidence	Remote, United StatesHQ checked Sep 20, 2026	51-200	245 contacts →
	Strong evidence “We're the confidential, vendor‑free membership organization for people leading social media at the world's biggest companies.” Source: RevenueBase Database · checked Sep 20, 2026
22	Broker Network	Indirect evidence	Knaresborough, United KingdomHQ checked Sep 20, 2026	51-200	207 contacts →
	Indirect evidence “As a nationwide Network, we offer independent brokers a range of impeccably-led services that are proven to improve market presence and generate healthy profit.” Source: RevenueBase Database · checked Sep 20, 2026
23	Virtual, INC	Strong evidence	Wakefield, MA, United StatesHQ checked Sep 20, 2026	201-500	181 contacts →
	Strong evidence “Virtual is a top provider of professional services for associations, consortia and other membership-based organizations, delivering tailored management solutions that drive…” Source: RevenueBase Database · checked Sep 20, 2026
24	PCMA	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	176 contacts →
	Indirect evidence “Business events move the world forward.” Source: RevenueBase Database · checked Sep 20, 2026
25	Growthzone	Indirect evidence	Dover, DE, United StatesHQ checked Sep 20, 2026	51-200	172 contacts →
	Indirect evidence “GrowthZone delivers a full suite of solutions built for member-based organizations.” 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: membership organizations. 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 membership organizations.
Partial evidence: Its own public description names part of membership organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name membership organizations. 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 4,408 membership organizations worldwide

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Membership organizations worldwide at a glance

As of Sep 20, 2026

18.0%Verified-email coverage

13.5Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

2,477

11-50

1,141

51-200

451

201-500

179

501-1,000

1,001-5,000

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 membership organizations, 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 membership organizations are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “membership organizations”. 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 membership organizations), 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 membership organizations, 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, 10,691 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.

Membership organizations by location

19 lists · largest first

Every Membership organizations 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 membership organizations, 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 membership organizations are there worldwide?

RevenueBase identified 4,408 membership organizations 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?

AAA, headquartered in Coppell, tops this list with the largest team on record.

Which country has the most membership organizations?

The United States leads with 1,519 companies, followed by the United Kingdom (346) and France (251). Every membership organizations list by country and city is linked on this page.

Which city has the most membership organizations?

London leads with 100 headquartered companies, followed by New York (51) and Paris (44).

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 10,691 verified decision-maker contacts tracked across these 4,408 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.