Company lists · Data refreshed September 2026

Top 25 Environmental organizations based in Washington, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 209 companies tracked

RevenueBase identified 209 company matches for environmental organizations associated with Washington, United States as of September 2026 and tracks 22,905 professional contacts across them, including 8,586 with verified work emails. Across the United States, Washington is the largest hub for this category.

This list covers company matches for environmental organizations associated with Washington, 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

209Companies

22,905Contacts tracked

8,586Verified emails

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The 25 largest environmental organizations based in Washington, United States

Ranked by team size

Top 25 of 209 company matches for environmental organizations based in Washington, 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	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
2	World Wildlife Fund	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,290 contacts →
	Exact match “Our planet faces many big conservation challenges.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	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
4	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
5	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
6	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
7	Sunrise Movement	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	n/a	222 contacts →
	Exact match “Sunrise is a movement of young people uniting to stop the climate crisis.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	League Of Conservation Voters	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	218 contacts →
	Exact match “LCV believes our earth is worth fighting for because everyone has a right to clean air, water, and a safe, healthy community.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	Defenders Of Wildlife	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	202 contacts →
	Exact match “Defenders of Wildlife is dedicated to the protection of all native animals and plants in their natural communities.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	The Wilderness Society	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	199 contacts →
	Exact match “The Wilderness Society (TWS) is the leading conservation organization working to protect America’s wild places and public lands for the health of local communities, wildlife, and…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	American Rivers	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	147 contacts →
	Exact match “American Rivers protects wild rivers, restores damaged rivers, and conserves clean water for people and nature.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	earthday.org	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	144 contacts →
	Exact match “EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	American Forests	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	136 contacts →
	Exact match “Founded in 1875, American Forests is the oldest national nonprofit conservation organization in the U.S.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	Resources For The Future	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	135 contacts →
	Exact match “Resources for the Future improves environmental, energy, and natural resource decisions through impartial economic research and policy engagement.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	Earthworks	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	126 contacts →
	Exact match “EARTHWORKS is a nonprofit organization dedicated to protecting communities and the environment from the impacts of irresponsible mineral and energy development while seeking…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	Environmental Working Group	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	120 contacts →
	Exact match “The Environmental Working Group is a non-profit, non-partisan organization dedicated to protecting human health and the environment.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	American Forest Foundation	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	118 contacts →
	Exact match “The American Forest Foundation (AFF) is a national conservation organization that works to deliver clean water, wildlife habitat, carbon sequestration and storage, and sustainable…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	Environmental LAW Institute	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	102 contacts →
	Exact match “The Environmental Law Institute (ELI) makes law work for people, places, and the planet.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	Greenpeace USA	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	97 contacts →
	Exact match “Founded in 1971, Greenpeace began when a small group of activists sailed from Vancouver to protest nuclear testing at Amchitka, Alaska.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Society Of Environmental Toxicology And Chemistry Setac	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	91 contacts →
	Exact match “The mission of the Society of Environmental Toxicology and Chemistry (SETAC) is to advance environmental science and management.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	Bezos Earth Fund	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	89 contacts →
	Exact match “Built on the belief that Earth is the best planet in the solar system, Jeff Bezos & Lauren Sánchez Bezos have made a $10 billion commitment to protect and restore the natural…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Earthecho International	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	n/a	86 contacts →
	Exact match “EarthEcho International is a nonprofit 501c3 organization founded in 2005 by siblings Philippe and Alexandra Cousteau in honor of their father Philippe Cousteau Sr, son of the…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	Delterra	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	83 contacts →
	Exact match “Delterra is an environmental NGO, originally founded by McKinsey & Company.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	Earthrights International	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	82 contacts →
	Exact match “EarthRights International is a nongovernmental, nonprofit organization that combines the power of law and the power of people in defense of earth rights.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25	Forest Trends Association	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	11-50	76 contacts →
	Exact match “Forest Trends works to conserve forests and other ecosystems through the creation and wide adoption of a range of environmental finance, market, and other payment and incentive…” 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 organizations”. 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 209 environmental organizations based in Washington, United States

See the full list, filter by size, metro and specialty, and access 8,586 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Environmental organizations based in Washington, United States at a glance

As of Sep 19, 2026

37.5%Verified-email coverage

109.6Average contacts per company

1-10Median size (employees)

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

116

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 209 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 Washington, United States whose business descriptions match “environmental organizations” 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 8,586 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 organizations by metro in the United States

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 organizations”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental organizations are there based in Washington, United States?

RevenueBase identified 209 company matches for environmental organizations associated with Washington, 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?

World Resources Institute tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most environmental organizations?

Washington leads the United States with 209 company records, followed by New York (204) and Los Angeles (133).

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 8,586 professional contacts with verified work emails tracked across these 209 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.