Company lists · Data refreshed September 2026

Top 25 Environmental education nonprofits based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 1,976 companies tracked

RevenueBase identified 1,976 environmental education nonprofits headquartered in the United States as of September 2026 and tracks 31,804 professional contacts across them, including 10,941 with verified work emails. Washington is the largest hub.

This list covers environmental education nonprofits 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 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

1,976Companies

31,804Contacts tracked

10,941Verified emails

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The 25 largest environmental education nonprofits based in the United States

Ranked by team size

Top 25 of 1,976 environmental education nonprofits based in the 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 education 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	The Nature Conservancy	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,526 contacts →
	Indirect evidence “Air, water, food, shelter, income: nature sustains every aspect of our lives.” Source: RevenueBase Database · checked Sep 19, 2026
2	Natural Resources Defense Council Nrdc	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	942 contacts →
	Partial evidence “NRDC is the nation's most effective environmental action organization.” Source: RevenueBase Database · checked Sep 19, 2026
3	Student Conservation Association	Partial evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	201-500	795 contacts →
	Partial 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 19, 2026
4	Mass Audubon	Indirect evidence	Lincoln, MA, United StatesHQ checked Sep 19, 2026	201-500	554 contacts →
	Indirect evidence “Mass Audubon is the largest nature-based conservation organization in New England.” Source: RevenueBase Database · checked Sep 19, 2026
5	Unity Environmental University	Partial evidence	New Gloucester, ME, United StatesHQ checked Sep 19, 2026	51-200	527 contacts →
	Partial evidence “For more than fifty years, Unity Environmental University has been preparing the next generation of environmental professionals and leaders to successfully face real-world…” Source: RevenueBase Database · checked Sep 19, 2026
6	RARE	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	51-200	368 contacts →
	Indirect evidence “Rare is a global leader in driving social change for people and nature.” Source: RevenueBase Database · checked Sep 19, 2026
7	University Of Washington, Environmental Studies	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	n/a	244 contacts →
	Strong evidence “The Program on the Environment is an innovative experiment in interdisciplinary environmental education combining natural science, the human dimension, and community-based…” Source: RevenueBase Database · checked Sep 19, 2026
8	Seaside Sustainability	Strong evidence	Gloucester, MA, United StatesHQ checked Sep 19, 2026	51-200	240 contacts →
	Strong evidence “Seaside Sustainability is a nationally recognized, award-winning 501(c)3 charitable organization dedicated to community engagement, education and environmental conservation.” Source: RevenueBase Database · checked Sep 19, 2026
9	The Conservation Fund	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	201-500	224 contacts →
	Indirect evidence “We are in the business of conservation, creating innovative solutions that drive nature-based action for climate protection, sustainable economies and vibrant communities.” Source: RevenueBase Database · checked Sep 19, 2026
10	Conservation Corps Minnesota & Iowa	Partial evidence	St. Paul, MN, United StatesHQ checked Sep 19, 2026	201-500	207 contacts →
	Partial evidence “At Conservation Corps Minnesota & Iowa, youth and young adults grow as environmental stewards and leaders while giving back to the community through meaningful service.” Source: RevenueBase Database · checked Sep 19, 2026
11	Montana Conservation Corps	Partial evidence	Bozeman, MT, United StatesHQ checked Sep 19, 2026	n/a	193 contacts →
	Partial evidence “Montana Conservation Corps is a nonprofit organization whose mission is to inspire young people, through hands-on conservation service to be leaders, stewards of the land, and…” Source: RevenueBase Database · checked Sep 19, 2026
12	Naturebridge	Partial evidence	Sausalito, CA, United StatesHQ checked Sep 19, 2026	201-500	188 contacts →
	Partial evidence “Environmental science in nature’s classroom NatureBridge provides hands-on environmental science programs for young people.” Source: RevenueBase Database · checked Sep 19, 2026
13	Grownyc	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	51-200	185 contacts →
	Indirect evidence “GrowNYC is a hands-on non-profit with a mission to empower all New Yorkers with equitable access to fresh, locally grown food and neighborhood green spaces, reduce waste, and care…” Source: RevenueBase Database · checked Sep 19, 2026
14	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
15	Holden Forests & Gardens	Partial evidence	Kirtland, OH, United StatesHQ checked Sep 19, 2026	51-200	156 contacts →
	Partial evidence “Holden Forests & Gardens is made up of two of Northeast Ohio’s most important environmental and cultural institutions, the Holden Arboretum and Cleveland Botanical Garden, whose…” Source: RevenueBase Database · checked Sep 19, 2026
16	Seeds Ecology & Education Centers	Partial evidence	Traverse City, MI, United StatesHQ checked Sep 19, 2026	51-200	146 contacts →
	Partial evidence “We are a 501c3 nonprofit organization established to foster local solutions to global issues.” Source: RevenueBase Database · checked Sep 19, 2026
17	earthday.org	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	144 contacts →
	Partial evidence “EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
18	Ecology Action	Indirect evidence	Santa Cruz, CA, United StatesHQ checked Sep 19, 2026	51-200	140 contacts →
	Indirect evidence “Ecology Action is an award-winning California 501(c)(3) non-profit that’s been inspiring sustainable community actions since 1970.” Source: RevenueBase Database · checked Sep 19, 2026
19	The School For Field Studies	Partial evidence	Beverly, MA, United StatesHQ checked Sep 19, 2026	51-200	139 contacts →
	Partial evidence “The School for Field Studies (SFS) is a unique 501c3 nonprofit academic institution headquartered in Beverly, MA.” Source: RevenueBase Database · checked Sep 19, 2026
20	Treepeople	Indirect evidence	Beverly Hills, CA, United StatesHQ checked Sep 19, 2026	51-200	136 contacts →
	Indirect evidence “As the Los Angeles region faces severe impacts from climate change, TreePeople unites the power of trees, people and nature-based solutions to grow a more climate-ready city.” Source: RevenueBase Database · checked Sep 19, 2026
21	Environmental Charter Schools	Partial evidence	Redondo Beach, CA, United StatesHQ checked Sep 19, 2026	51-200	130 contacts →
	Partial evidence “Environmental Charter Schools (ECS) is an innovative network of free public schools serving South Los Angeles.” Source: RevenueBase Database · checked Sep 19, 2026
22	KUPU	Indirect evidence	Honolulu, HI, United StatesHQ checked Sep 19, 2026	51-200	127 contacts →
	Indirect evidence “Much like the Kupukupu Fern, which is one of the first plants to bring life back to the land after a devastating lava flow, Kupu’s heart is to bring life back to the people, land…” Source: RevenueBase Database · checked Sep 19, 2026
23	SEI	Strong evidence	San Rafael, CA, United StatesHQ checked Sep 19, 2026	51-200	127 contacts →
	Strong evidence “SEI is an environmental nonprofit that builds leaders to accelerate climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026
24	Teton Science Schools	Partial evidence	Jackson, WY, United StatesHQ checked Sep 19, 2026	51-200	118 contacts →
	Partial evidence “Teton Science Schools connects people, place, and nature through education.” Source: RevenueBase Database · checked Sep 19, 2026
25	Islandwood	Strong evidence	Bainbridge Island, WA, United StatesHQ checked Sep 19, 2026	51-200	112 contacts →
	Strong evidence “As an environmental education nonprofit, we believe there are many paths to creating a more sustainable and equitable world.” 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 education 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 education nonprofits.
Partial evidence: Its own public description names part of environmental education nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental education 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 1,976 environmental education nonprofits based in the United States

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Environmental education nonprofits based in the United States at a glance

As of Sep 19, 2026

34.4%Verified-email coverage

16.1Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,346

11-50

481

51-200

108

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 1,976 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 education 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 the United States whose own description of what they do matches “environmental education 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 education 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 education nonprofits, 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, 10,941 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 education nonprofits by metro

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 education 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 education nonprofits are there based in the United States?

RevenueBase identified 1,976 environmental education nonprofits 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?

The Nature Conservancy, headquartered in Arlington, tops this list with the largest team on record.

Which city has the most environmental education nonprofits?

Washington leads with 62 headquartered companies, followed by New York (51) and Los Angeles (36).

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 10,941 verified decision-maker contacts tracked across these 1,976 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.