Company lists · Data refreshed September 2026

Top 25 Volunteer organizations based in the United States

Name: Volunteer organizations based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 2,730 companies tracked

RevenueBase identified 2,730 volunteer organizations headquartered in the United States as of September 2026 and tracks 77,464 professional contacts across them, including 10,921 with verified work emails. New York is the largest hub.

This list covers volunteer organizations headquartered in the United States, 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 22, 2026.

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 22, 2026 86% judged on-target in blind review

2,730Companies

77,464Contacts tracked

10,921Verified emails

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The 25 largest volunteer organizations based in the United States

Ranked by team size

Top 25 of 2,730 volunteer organizations based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to volunteer 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	Ymca Of The USA	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	n/a	31,282 contacts →
	Indirect evidence “For 175 years, the Y has been a place where meaningful connections help build stronger communities.” Source: RevenueBase Database · checked Sep 22, 2026
2	Scouting America	Indirect evidence	Irving, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	5,563 contacts →
	Indirect evidence “Scouting America (formerly Boy Scouts of America) is one of the largest Scouting organizations in the United States of America and one of the largest youth organizations in the…” Source: RevenueBase Database · checked Sep 22, 2026
3	Endeavors	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,137 contacts →
	Indirect evidence “Endeavors is a national service organization that serves our communities’ most vulnerable populations.” Source: RevenueBase Database · checked Sep 22, 2026
4	Student Conservation Association	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 22, 2026	201-500	795 contacts →
	Indirect evidence “The Student Conservation Association (SCA) is the largest provider of hands-on environmental conservation programs for youth and adults.” Source: RevenueBase Database · checked Sep 22, 2026
5	Bronxworks	Indirect evidence	Bronx, NY, United StatesHQ checked Sep 22, 2026	501-1,000	762 contacts →
	Indirect evidence “BronxWorks helps individuals and families improve their economic and social well-being.” Source: RevenueBase Database · checked Sep 22, 2026
6	Team Rubicon	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 22, 2026	n/a	748 contacts →
	Indirect evidence “Team Rubicon is a veteran-led humanitarian organization that serves global communities before, during, and after disasters and crises.” Source: RevenueBase Database · checked Sep 22, 2026
7	Society Of St. Vincent DE Paul	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 22, 2026	51-200	594 contacts →
	Indirect evidence “The Society of St.” Source: RevenueBase Database · checked Sep 22, 2026
8	Volunteers Of America LOS Angeles	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 22, 2026	501-1,000	573 contacts →
	Indirect evidence “A comprehensive human service organization dedicated to uplifting the lives of individuals and entire communities in Los Angeles since 1896.” Source: RevenueBase Database · checked Sep 22, 2026
9	TZU CHI USA	Strong evidence	San Dimas, CA, United StatesHQ checked Sep 22, 2026	51-200	556 contacts →
	Strong evidence “The Buddhist Tzu Chi Foundation (Tzu Chi USA) is a volunteer-based international non-governmental organization established by Dharma Master Cheng Yen in Hualien, Taiwan, in 1966.” Source: RevenueBase Database · checked Sep 22, 2026
10	Goodera	Strong evidence	San Mateo, CA, United StatesHQ checked Sep 22, 2026	51-200	431 contacts →
	Strong evidence “Goodera executes hosted volunteering experiences that are accessible, engaging, and impactful for the world’s leading organizations like IBM, Airbnb, ServiceNow, Visa, and Target…” Source: RevenueBase Database · checked Sep 22, 2026
11	American Legion Auxiliary	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 22, 2026	n/a	383 contacts →
	Strong evidence “The American Legion Auxiliary, founded in 1919, is a community of volunteers serving veterans, military, and their families.” Source: RevenueBase Database · checked Sep 22, 2026
12	Sunnyside Community Services	Indirect evidence	Sunnyside, NY, United StatesHQ checked Sep 22, 2026	51-200	363 contacts →
	Indirect evidence “Sunnyside Community Services (SCS) is a community-based nonprofit centered on the belief that every person deserves meaningful support to achieve their aspirations – especially…” Source: RevenueBase Database · checked Sep 22, 2026
13	St. Vincent DE Paul Georgia	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 22, 2026	n/a	348 contacts →
	Indirect evidence “At St.” Source: RevenueBase Database · checked Sep 22, 2026
14	SBP	Indirect evidence	New Orleans, LA, United StatesHQ checked Sep 22, 2026	51-200	340 contacts →
	Indirect evidence “SBP is a national social impact organization dedicated to empowering communities to shrink the time between disaster and recovery by rebuilding homes, increasing preparedness and…” Source: RevenueBase Database · checked Sep 22, 2026
15	Global Brigades, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 22, 2026	51-200	333 contacts →
	Indirect evidence “Global Brigades empowers communities in Honduras, Panama, Guatemala, Belize, Ghana, and Greece to drive their own development through a holistic model of health and economic…” Source: RevenueBase Database · checked Sep 22, 2026
16	JA Worldwide	Indirect evidence	Boston, MA, United StatesHQ checked Sep 22, 2026	1,001-5,000	327 contacts →
	Indirect evidence “As one of the world’s largest and most impactful youth-serving NGOs, JA Worldwide delivers hands-on, immersive learning in entrepreneurship, work readiness, and financial health.” Source: RevenueBase Database · checked Sep 22, 2026
17	Goddard Riverside	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	501-1,000	312 contacts →
	Indirect evidence “Goddard Riverside is one of New York City's leading human service organizations.” Source: RevenueBase Database · checked Sep 22, 2026
18	Ymca Of Greater Pittsburgh	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 22, 2026	201-500	292 contacts →
	Indirect evidence “Our Mission Put Christian principles into practice through programs that build healthy spirit, mind and body for all.” Source: RevenueBase Database · checked Sep 22, 2026
19	Chautauqua Institution	Indirect evidence	Chautauqua, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	288 contacts →
	Indirect evidence “Chautauqua Institution is a not-for-profit global convener of dialogue on the most significant issues of the day through engagement across four pillars of the arts, education…” Source: RevenueBase Database · checked Sep 22, 2026
20	Ymca Of The Pikes Peak Region	Indirect evidence	Colorado Springs, United StatesHQ checked Sep 22, 2026	501-1,000	285 contacts →
	Indirect evidence “As part of the largest not-for-profit community based organization in America, the YMCA of the Pikes Peak Region is committed to extending our charitable heritage by directly…” Source: RevenueBase Database · checked Sep 22, 2026
21	Taproot Foundation	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 22, 2026	n/a	275 contacts →
	Indirect evidence “Taproot Foundation is a nonprofit organization connecting communities and driving social change.” Source: RevenueBase Database · checked Sep 22, 2026
22	World Renew	Indirect evidence	Byron Center, MI, United StatesHQ checked Sep 22, 2026	51-200	271 contacts →
	Indirect evidence “At World Renew, we join with the world’s families to change the story of hunger, poverty, and illness.” Source: RevenueBase Database · checked Sep 22, 2026
23	Crowddoing	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 22, 2026	n/a	237 contacts →
	Indirect evidence “CrowdDoing.world is a joint initiative of Match4Action Foundation and Reframe It.” Source: RevenueBase Database · checked Sep 22, 2026
24	Volunteer Match, Powered By Idealist	Strong evidence	New York, NY, United StatesHQ checked Sep 22, 2026	n/a	234 contacts →
	Strong evidence “VolunteerMatch, Powered by Idealist is the world's largest volunteer recruitment and engagement network.” Source: RevenueBase Database · checked Sep 22, 2026
25	Conservation Legacy	Indirect evidence	Durango, CO, United StatesHQ checked Sep 22, 2026	51-200	213 contacts →
	Indirect evidence “Conservation Legacy is a national organization dedicated to supporting locally based conservation service programs.” Source: RevenueBase Database · checked Sep 22, 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: volunteer 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 volunteer organizations.
Partial evidence: Its own public description names part of volunteer organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name volunteer 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 2,730 volunteer organizations based in the United States

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Volunteer organizations based in the United States at a glance

As of Sep 22, 2026

14.1%Verified-email coverage

28.4Average contacts per company

1-10Median size (employees)

2.5%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

1,738

11-50

581

51-200

232

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,730 companies.

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 volunteer 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “volunteer 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 volunteer 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 volunteer organizations, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 10,921 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 22, 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.

Volunteer organizations by metro

Volunteer organizations in New York67
Volunteer organizations in Los Angeles56
Volunteer organizations in Washington46
Volunteer organizations in Atlanta37
Volunteer organizations in Chicago35
Volunteer organizations in Dallas28
Volunteer organizations in Houston27
Volunteer organizations in San Diego25

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 volunteer 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 volunteer organizations are there based in the United States?

RevenueBase identified 2,730 volunteer organizations headquartered in the United States 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?

Ymca Of The USA, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most volunteer organizations?

New York leads with 67 headquartered companies, followed by Los Angeles (56) and Washington (46).

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 10,921 verified decision-maker contacts tracked across these 2,730 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 22, 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.