Company lists · Data refreshed September 2026

Top 25 Environmental conservation groups based in the United States

Name: Environmental conservation groups 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 290 companies tracked

RevenueBase identified 290 environmental conservation groups headquartered in the United States as of September 2026 and tracks 12,051 professional contacts across them, including 4,912 with verified work emails. Washington is the largest hub.

This list covers environmental conservation groups 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

290Companies

12,051Contacts tracked

4,912Verified emails

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The 25 largest environmental conservation groups based in the United States

Ranked by team size

Top 25 of 290 environmental conservation groups 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 conservation groups: 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	National Wildlife Federation	Partial evidence	Reston, VA, United StatesHQ checked Sep 19, 2026	201-500	585 contacts →
	Partial evidence “As America's largest non-profit conservation organization, the National Wildlife Federation works closely with those who span the social and political spectrum, but who are…” Source: RevenueBase Database · checked Sep 19, 2026
4	Mass Audubon	Partial evidence	Lincoln, MA, United StatesHQ checked Sep 19, 2026	201-500	554 contacts →
	Partial evidence “Mass Audubon is the largest nature-based conservation organization in New England.” Source: RevenueBase Database · checked Sep 19, 2026
5	Center For Biological Diversity	Indirect evidence	Tucson, AZ, United StatesHQ checked Sep 19, 2026	51-200	219 contacts →
	Indirect evidence “At the Center for Biological Diversity, we believe that the welfare of human beings is deeply linked to nature, to the existence in our world of a vast diversity of wild animals…” Source: RevenueBase Database · checked Sep 19, 2026
6	Defenders Of Wildlife	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	202 contacts →
	Indirect evidence “Defenders of Wildlife is dedicated to the protection of all native animals and plants in their natural communities.” Source: RevenueBase Database · checked Sep 19, 2026
7	Point Blue Conservation Science	Partial evidence	Petaluma, CA, United StatesHQ checked Sep 19, 2026	51-200	160 contacts →
	Partial evidence “Point Blue Conservation Science (Point Blue) is dedicated to conserving birds, other wildlife, and ecosystems through innovative scientific research, restoration, outreach and…” Source: RevenueBase Database · checked Sep 19, 2026
8	Greenpeace USA	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	97 contacts →
	Indirect evidence “Founded in 1971, Greenpeace began when a small group of activists sailed from Vancouver to protest nuclear testing at Amchitka, Alaska.” Source: RevenueBase Database · checked Sep 19, 2026
9	Bridging The GAP	Partial evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	11-50	83 contacts →
	Partial evidence “Bridging The Gap brings people together to protect and restore the web of life on Earth and foster inclusive, thriving communities through environmental education, innovation, and…” Source: RevenueBase Database · checked Sep 19, 2026
10	Save The Sound	Partial evidence	New Haven, CT, United StatesHQ checked Sep 19, 2026	11-50	74 contacts →
	Partial evidence “Save the Sound leads environmental action across Connecticut, Westchester, NYC, and Long Island.” Source: RevenueBase Database · checked Sep 19, 2026
11	Michigan League Of Conservation Voters	Partial evidence	Ann Arbor, MI, United StatesHQ checked Sep 19, 2026	11-50	64 contacts →
	Partial evidence “The Michigan League of Conservation Voters is a statewide political organization whose mission is to elect pro-conservation candidates to office and to hold all decision makers…” Source: RevenueBase Database · checked Sep 19, 2026
12	Earth Island Institute	Strong evidence	Berkeley, CA, United StatesHQ checked Sep 19, 2026	51-200	64 contacts →
	Strong evidence “Earth Island Institute is a nonprofit environmental organization and fiscal sponsor to more than seventy-five projects working in the areas of conservation, climate change…” Source: RevenueBase Database · checked Sep 19, 2026
13	Delaware Nature Society	Strong evidence	Hockessin, DE, United StatesHQ checked Sep 19, 2026	51-200	64 contacts →
	Strong evidence “Founded in 1964, Delaware Nature Society works to improve the environment through conservation, advocacy, and education.” Source: RevenueBase Database · checked Sep 19, 2026
14	Nature Forward	Strong evidence	Chevy Chase, MD, United StatesHQ checked Sep 19, 2026	11-50	64 contacts →
	Strong evidence “Nature Forward is the longest-serving independent environmental organization in the DC area, linking conservation with environmental education.” Source: RevenueBase Database · checked Sep 19, 2026
15	Rainforest Trust	Indirect evidence	Warrenton, VA, United StatesHQ checked Sep 19, 2026	11-50	53 contacts →
	Indirect evidence “For more than 35 years, Rainforest Trust has not wavered from its mission of preventing deforestation, preserving critical habitat and safeguarding endangered species.” Source: RevenueBase Database · checked Sep 19, 2026
16	Washington Conservation Action	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	51 contacts →
	Strong evidence “Washington Conservation Action’s mission is to advocate for environmental progress and justice through actions that mobilize the public, elect champions for the environment, and…” Source: RevenueBase Database · checked Sep 19, 2026
17	Institute For Applied Ecology	Indirect evidence	Corvallis, OR, United StatesHQ checked Sep 19, 2026	51-200	44 contacts →
	Indirect evidence “The Institute for Applied Ecology is a non-profit 501(c)(3) organization founded in with a mission to conserve native species and habitats.” Source: RevenueBase Database · checked Sep 19, 2026
18	Earthplace	Partial evidence	Westport, CT, United StatesHQ checked Sep 19, 2026	51-200	42 contacts →
	Partial evidence “Where nature education, conservation, and science meet.” Source: RevenueBase Database · checked Sep 19, 2026
19	Natural Resources Council Of Maine	Partial evidence	Augusta, ME, United StatesHQ checked Sep 19, 2026	11-50	42 contacts →
	Partial evidence “The Natural Resources Council of Maine is our state’s leading nonprofit membership organization protecting, restoring, and conserving Maine’s environment, now and for future…” Source: RevenueBase Database · checked Sep 19, 2026
20	Conservation Colorado	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	42 contacts →
	Indirect evidence “The Future Is Worth The Fight.” Source: RevenueBase Database · checked Sep 19, 2026
21	Piedmont Wildlife Center	Indirect evidence	Durham, NC, United StatesHQ checked Sep 19, 2026	n/a	42 contacts →
	Indirect evidence “Piedmont Wildlife Center is a 501(C)3 nonprofit inspiring lifelong connections with nature through engaging learning experiences, youth camps, wildlife education, and programs…” Source: RevenueBase Database · checked Sep 19, 2026
22	D.J. Case & Associates	Indirect evidence	Mishawaka, IN, United StatesHQ checked Sep 19, 2026	11-50	40 contacts →
	Indirect evidence “We work with state and federal natural resource agencies and organizations.” Source: RevenueBase Database · checked Sep 19, 2026
23	Conservation Nation	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	39 contacts →
	Indirect evidence “In the fight to save endangered animals and the planet, we need every smart voice and solution at the table.” Source: RevenueBase Database · checked Sep 19, 2026
24	Pennsylvania Environmental Council PEC	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “The Pennsylvania Environmental Council (PEC) protects and restores the natural and built environments through innovation, collaboration, education and advocacy.” Source: RevenueBase Database · checked Sep 19, 2026
25	Environmental Nature Center	Partial evidence	Newport Beach, CA, United StatesHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “Please join us in connecting people to nature by donating to the Environmental Nature Center this giving season.” 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 conservation groups. 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 conservation groups.
Partial evidence: Its own public description names part of environmental conservation groups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental conservation groups. 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 290 environmental conservation groups based in the United States

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Environmental conservation groups based in the United States at a glance

As of Sep 19, 2026

40.8%Verified-email coverage

41.6Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

188

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 290 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 conservation groups, 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 conservation groups”. 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 conservation groups), 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 conservation groups, 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, 4,912 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.

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 conservation groups, 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 conservation groups are there based in the United States?

RevenueBase identified 290 environmental conservation groups 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 conservation groups?

Washington leads with 9 headquartered companies, followed by Miami (6) and New York (6).

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 4,912 verified decision-maker contacts tracked across these 290 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.