Company lists · Data refreshed September 2026

Top 25 Environmental nonprofits based in the United States

Name: Environmental 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 5,243 companies tracked

RevenueBase identified 5,243 company matches for environmental nonprofits associated with the United States as of September 2026 and tracks 80,760 professional contacts across them, including 28,852 with verified work emails. New York is the largest hub.

This list covers company matches for environmental nonprofits associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 19, 2026 How this list was built

5,243Companies

80,760Contacts tracked

28,852Verified emails

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The 25 largest environmental nonprofits based in the United States

Ranked by team size

Top 25 of 5,243 company matches for environmental nonprofits based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	The Nature Conservancy	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	5,001-10,000	6,526 contacts →
	Exact match “Air, water, food, shelter, income: nature sustains every aspect of our lives.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Conservation International	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	501-1,000	1,560 contacts →
	Exact match “Since 1987, Conservation International has worked to spotlight and secure the critical benefits that nature provides to humanity.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	World Resources Institute	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,359 contacts →
	Exact match “WRI works to improve people’s lives, protect and restore nature and stabilize the climate.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Environmental Defense Fund	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,352 contacts →
	Exact match “We are Environmental Defense Fund, a leading environmental nonprofit focused on stabilizing the climate while helping build strong and healthy communities.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	Casa Familiar	Exact match	Albuquerque, NM, United StatesHQ recorded Sep 19, 2026	n/a	1,132 contacts →
	Exact match “Casa Familiar is a primary/secondary education company based out of 501 Atrisco Dr Sw, Albuquerque, New Mexico, United States.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	Sierra Club	Exact match	Oakland, CA, United StatesHQ recorded Sep 19, 2026	501-1,000	1,069 contacts →
	Exact match “At the Sierra Club, we believe in the power of togetherness.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	Natural Resources Defense Council Nrdc	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	501-1,000	942 contacts →
	Exact match “NRDC is the nation's most effective environmental action organization.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	Student Conservation Association	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	201-500	795 contacts →
	Exact match “The Student Conservation Association (SCA) is the largest provider of hands-on environmental conservation programs for youth and adults.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	Monterey BAY Aquarium	Exact match	Monterey, CA, United StatesHQ recorded Sep 19, 2026	501-1,000	738 contacts →
	Exact match “The mission of the nonprofit Monterey Bay Aquarium is to inspire conservation of the ocean.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	Earthjustice	Exact match	San Francisco, United StatesHQ recorded Sep 19, 2026	501-1,000	672 contacts →
	Exact match “Earthjustice is a non-profit public interest law organization dedicated to protecting the magnificent places, natural resources, and wildlife of this earth, and to defending the…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	National Wildlife Federation	Exact match	Reston, VA, United StatesHQ recorded Sep 19, 2026	201-500	585 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	Mass Audubon	Exact match	Lincoln, MA, United StatesHQ recorded Sep 19, 2026	201-500	554 contacts →
	Exact match “Mass Audubon is the largest nature-based conservation organization in New England.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	U.S. Green Building Council	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	201-500	553 contacts →
	Exact match “The U.S.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	Trust For Public Land	Exact match	San Francisco, CA, United StatesHQ recorded Sep 19, 2026	201-500	531 contacts →
	Exact match “Trust for Public Land (TPL) is a national nonprofit that works to connect everyone to the benefits and joys of the outdoors.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	The Providencia Group	Exact match	Ashburn, VA, United StatesHQ recorded Sep 19, 2026	201-500	444 contacts →
	Exact match “At Providencia we are focused on positively impacting the communities where we operate, the lives of vulnerable and underserved populations around the world, and the health of our…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	Shimano	Exact match	Irvine, CA, United StatesHQ recorded Sep 19, 2026	201-500	382 contacts →
	Exact match “To promote health and happiness through the enjoyment of nature and the world around us” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	Appalachian Mountain Club	Exact match	Boston, MA, United StatesHQ recorded Sep 19, 2026	201-500	378 contacts →
	Exact match “The mission of the Appalachian Mountain Club is to foster the protection, enjoyment, and understanding of the outdoors.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	RARE	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	51-200	368 contacts →
	Exact match “Rare is a global leader in driving social change for people and nature.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	Clean Water Action	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	366 contacts →
	Exact match “Since our founding during the campaign to pass the landmark Clean Water Act in 1972, Clean Water Action has worked to win strong health and environmental protections by bringing…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	IFAW	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	201-500	355 contacts →
	Exact match “IFAW explores new ways to improve conditions for animals, people, and the place we call home-and we’ve been leading the way for over 50 years.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	Golden Gate National Parks Conservancy	Exact match	San Francisco, CA, United StatesHQ recorded Sep 19, 2026	201-500	315 contacts →
	Exact match “Since 1981, the Golden Gate National Parks Conservancy (Parks Conservancy) has served as the nonprofit partner of the National Park Service, collaborating with the Presidio Trust…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Chesapeake BAY Foundation	Exact match	Annapolis, MD, United StatesHQ recorded Sep 19, 2026	51-200	312 contacts →
	Exact match “The Chesapeake Bay Foundation (CBF) fights for bold and creative solutions to the pollution that plagues the Bay and its tributaries.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	Whitewater	Exact match	Charlotte, NC, United StatesHQ recorded Sep 19, 2026	501-1,000	312 contacts →
	Exact match “Whitewater is a 501(c)(3) nonprofit and outdoor lifestyle brand that facilitates outdoor access by lowering barriers and inspiring people to get outside.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	National Parks Conservation Association	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	303 contacts →
	Exact match “Named a USA Top Workplace in 2023** For a century, National Parks Conservation Association has been a powerful independent voice working to strengthen and protect America's…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25	Union Of Concerned Scientists	Exact match	Cambridge, MA, United StatesHQ recorded Sep 19, 2026	201-500	254 contacts →
	Exact match “Our mission is to use rigorous, independent science to solve our planet's most pressing problems.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “environmental nonprofits”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 5,243 environmental nonprofits based in the United States

See the full list, filter by size, metro and specialty, and access 28,852 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Environmental nonprofits based in the United States at a glance

As of Sep 19, 2026

35.7%Verified-email coverage

15.4Average contacts per company

1-10Median size (employees)

4.1%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

3,659

11-50

1,223

51-200

259

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 5,243 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “environmental nonprofits” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 28,852 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Environmental nonprofits by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “environmental nonprofits”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental nonprofits are there based in the United States?

RevenueBase identified 5,243 company matches for environmental nonprofits associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

The Nature Conservancy tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most environmental nonprofits?

New York leads with 216 company records, followed by Washington (195) 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 limited free results with 500 credits to start. Upgrading provides access to the 28,852 professional contacts with verified work emails tracked across these 5,243 companies; direct dials are available where recorded.

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 SmartSearch, 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.