Company lists · Data refreshed September 2026

Top 25 Environmental nonprofits based in Boston, United States

Name: Environmental nonprofits based in Boston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 55 companies tracked

RevenueBase identified 55 environmental nonprofits headquartered in Boston, United States as of September 2026 and tracks 1,905 professional contacts across them, including 782 with verified work emails. Washington is the largest hub.

This list covers environmental nonprofits headquartered in Boston, 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 19, 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 19, 2026 86% judged on-target in blind review

55Companies

1,905Contacts tracked

782Verified emails

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The 25 largest environmental nonprofits based in Boston, United States

Ranked by team size

Top 25 of 55 environmental nonprofits based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental nonprofits: 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	Appalachian Mountain Club	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	378 contacts →
	Indirect evidence “The mission of the Appalachian Mountain Club is to foster the protection, enjoyment, and understanding of the outdoors.” Source: RevenueBase Database · checked Sep 19, 2026
2	Ceres, INC	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	241 contacts →
	Partial evidence “Ceres is a nonprofit advocacy organization working to accelerate the transition to a cleaner, more just, and resilient world.” Source: RevenueBase Database · checked Sep 19, 2026
3	Conservation LAW Foundation	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	174 contacts →
	Indirect evidence “Since 1966, CLF has taken on powerful opponents who would pollute our air and water and squander our resources.” Source: RevenueBase Database · checked Sep 19, 2026
4	Earthwatch Institute	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	n/a	100 contacts →
	Indirect evidence “Earthwatch Institute is focused on expanding access to hands-on science education.” Source: RevenueBase Database · checked Sep 19, 2026
5	Student Pirgs	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	85 contacts →
	Indirect evidence “See more and apply online at http://jobs.studentpirgs.org The Student PIRGs are hiring Campus Organizers to lead and train the next generation of activists!” Source: RevenueBase Database · checked Sep 19, 2026
6	Corporate Accountability	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	47 contacts →
	Indirect evidence “Corporate Accountability stops transnational corporations from devastating democracy, trampling human rights, and destroying our planet.” Source: RevenueBase Database · checked Sep 19, 2026
7	Environmental League Of Massachusetts ELM	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “The Environmental League of Massachusetts advocates for policy that meets the scale and urgency of our environmental challenges.” Source: RevenueBase Database · checked Sep 19, 2026
8	Alternatives For Community And Environment	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	23 contacts →
	Partial evidence “ACE builds the power of communities of color and low income communities in Massachusetts to eradicate environmental racism and classism, create healthy sustainable communities…” Source: RevenueBase Database · checked Sep 19, 2026
9	Environmental Voter Project	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	20 contacts →
	Strong evidence “The Environmental Voter Project is a non-partisan nonprofit with a laser focus on getting environmentalists to vote.” Source: RevenueBase Database · checked Sep 19, 2026
10	KLA KIM Lundgren Associates	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	19 contacts →
	Indirect evidence “KLA is a small, woman-owned, Boston-based benefit corporation that partners with local governments across the country to build the sustainable, resilient communities they envision.” Source: RevenueBase Database · checked Sep 19, 2026
11	Living On Earth	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “As the planet we call home faces a climate emergency, Living on Earth is your go-to source for the latest coverage of climate change, ecology, and human health.” Source: RevenueBase Database · checked Sep 19, 2026
12	Applied Economics Clinic	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Partial evidence “Based in Massachusetts, the Applied Economics Clinic (AEC) is a mission-based non-profit consulting group that offers expert services in the areas of energy, environment, consumer…” Source: RevenueBase Database · checked Sep 19, 2026
13	Massrecycle	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Strong evidence “MassRecycle is a 501(c)3 nonprofit organization dedicated to promoting and realizing the vital environmental, social and economic benefits created by reducing, reusing, and…” Source: RevenueBase Database · checked Sep 19, 2026
14	Product Stewardship Institute	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	10 contacts →
	Partial evidence “The Product Stewardship Institute is a policy expert and consulting nonprofit that powers the emerging circular economy to ensure products are responsibly managed from design to…” Source: RevenueBase Database · checked Sep 19, 2026
15	Frontier Group Non-Profit Think Tank	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “Frontier Group provides information and ideas to build a healthier, more sustainable America.” Source: RevenueBase Database · checked Sep 19, 2026
16	Brightly	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “Climate change and food waste, two world-shaping challenges that threaten to disrupt the lives of not only those who experience food insecurity, but every single one of us.” Source: RevenueBase Database · checked Sep 19, 2026
17	Newmoa	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Partial evidence “Leading the Northeast to a sustainable, waste-free future NEWMOA is a non-profit, non-partisan, interstate association whose membership is composed of the state environment agency…” Source: RevenueBase Database · checked Sep 19, 2026
18	Safety For Nonprofits INC	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	8 contacts →
	Partial evidence “Safety For NonProfits, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
19	Community Action Works	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Partial evidence “At Community Action Works, we believe that environmental threats are big, but the power of well-organized community groups is bigger.” Source: RevenueBase Database · checked Sep 19, 2026
20	National Environmental LAW Center	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Partial evidence “The National Environmental Law Center (NELC) is a non-profit public interest litigation center founded in 1990 to enforce anti-pollution laws and promote long-term solutions to…” Source: RevenueBase Database · checked Sep 19, 2026
21	E INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Indirect evidence “e" inc.” Source: RevenueBase Database · checked Sep 19, 2026
22	Healthy Ocean Coalition	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence “Our Mission We are a national network of ocean lovers – a free-to-join coalition of the willing - dedicated to preventing the exploitation, destruction, and neglect of our ocean…” Source: RevenueBase Database · checked Sep 19, 2026
23	NET Zero Institute	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Partial evidence “We're redefining the relationship between business and the natural world to create competitive advantage while reducing adverse environmental impacts.” Source: RevenueBase Database · checked Sep 19, 2026
24	Merck Family Fund	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “In 1954, George W.” Source: RevenueBase Database · checked Sep 19, 2026
25	Sierra Club Massachusetts Chapter	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Partial evidence “Massachusetts Sierra Club is the state chapter of the largest, oldest, and most influential environmental grassroots organization in the country.” Source: RevenueBase Database · checked Sep 19, 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: environmental nonprofits. 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 environmental nonprofits.
Partial evidence: Its own public description names part of environmental nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental nonprofits. 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 55 environmental nonprofits based in Boston, United States

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Environmental nonprofits based in Boston, United States at a glance

As of Sep 19, 2026

41.0%Verified-email coverage

34.6Average contacts per company

1-10Median size (employees)

354.5%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

10001+

Email recency for this list is measured across the whole United States list rather than for Boston, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 55 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 environmental nonprofits, 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 Boston, United States whose own description of what they do matches “environmental nonprofits”. 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 environmental nonprofits), 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 environmental nonprofits, and records with no verified work email. Companies headquartered outside Boston 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, 782 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 19, 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.

Environmental nonprofits by metro in the United States

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 environmental nonprofits, 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 environmental nonprofits are there based in Boston, United States?

RevenueBase identified 55 environmental nonprofits headquartered in Boston, 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?

Appalachian Mountain Club, headquartered in Boston, tops this list with the largest team on record.

Which city has the most environmental nonprofits?

Washington leads with 195 headquartered companies, followed by New York (194) and San Francisco (126).

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 782 verified decision-maker contacts tracked across these 55 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 19, 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.