Company lists · Data refreshed September 2026

Top 25 Biodiversity conservation nonprofits based in the United States

Name: Biodiversity conservation 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 651 companies tracked

RevenueBase identified 651 biodiversity conservation nonprofits headquartered in the United States as of September 2026 and tracks 21,602 professional contacts across them, including 7,397 with verified work emails. Washington is the largest hub.

This list covers biodiversity conservation 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

651Companies

21,602Contacts tracked

7,397Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest biodiversity conservation nonprofits based in the United States

Ranked by team size

Top 25 of 651 biodiversity conservation 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 biodiversity conservation 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	Conservation International	Partial evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	501-1,000	1,560 contacts →
	Partial evidence “Since 1987, Conservation International has worked to spotlight and secure the critical benefits that nature provides to humanity.” Source: RevenueBase Database · checked Sep 19, 2026
3	World Wildlife Fund	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,290 contacts →
	Partial evidence “Our planet faces many big conservation challenges.” Source: RevenueBase Database · checked Sep 19, 2026
4	National Audubon Society	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	900 contacts →
	Indirect evidence “The National Audubon Society protects birds and the places they need, today and tomorrow, throughout the Americas using science, advocacy, education, and on-the-ground…” Source: RevenueBase Database · checked Sep 19, 2026
5	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
6	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
7	National Fish And Wildlife Foundation	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	252 contacts →
	Partial evidence “The National Fish and Wildlife Foundation (NFWF) works with partners to foster sustainable and impactful conservation solutions so that people and nature thrive together.” Source: RevenueBase Database · checked Sep 19, 2026
8	Seaside Sustainability	Partial evidence	Gloucester, MA, United StatesHQ checked Sep 19, 2026	51-200	240 contacts →
	Partial 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	Partial evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	201-500	224 contacts →
	Partial 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	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
11	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
12	Wildlife Works	Partial evidence	Mill Valley, CA, United StatesHQ checked Sep 19, 2026	201-500	188 contacts →
	Partial evidence “Wildlife Works is a community-centered wildlife conservation company that implements market-based initiatives to protect the planet’s threatened wilderness and endangered wildlife.” Source: RevenueBase Database · checked Sep 19, 2026
13	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
14	Mongabay	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 19, 2026	51-200	152 contacts →
	Indirect evidence “Mongabay.com publishes news and information on tropical forests and related topics.” Source: RevenueBase Database · checked Sep 19, 2026
15	American Forests	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	136 contacts →
	Strong evidence “Founded in 1875, American Forests is the oldest national nonprofit conservation organization in the U.S.” Source: RevenueBase Database · checked Sep 19, 2026
16	American Bird Conservancy	Indirect evidence	The Plains, VA, United StatesHQ checked Sep 19, 2026	51-200	120 contacts →
	Indirect evidence “American Bird Conservancy (ABC) takes bold action to conserve wild birds and their habitats throughout the Americas.” Source: RevenueBase Database · checked Sep 19, 2026
17	Ecology Project International	Indirect evidence	Missoula, MT, United StatesHQ checked Sep 19, 2026	51-200	105 contacts →
	Indirect evidence “EPI is a non-profit organization dedicated to developing place-based, ecological education partnerships between local experts and high school students to address critical…” Source: RevenueBase Database · checked Sep 19, 2026
18	The Wilds	Indirect evidence	Cumberland, OH, United StatesHQ checked Sep 19, 2026	51-200	88 contacts →
	Indirect evidence “At The Wilds, our mission is simple but powerful: Empowering People.” Source: RevenueBase Database · checked Sep 19, 2026
19	Marine Conservation Institute	Partial evidence	Glen Ellen, CA, United StatesHQ checked Sep 19, 2026	11-50	85 contacts →
	Partial evidence “Marine Conservation Institute is a team of highly-experienced marine scientists and environmental policy advocates dedicated to saving ocean life for us and future generations.” Source: RevenueBase Database · checked Sep 19, 2026
20	Fossil RIM Wildlife Center	Partial evidence	Glen Rose, TX, United StatesHQ checked Sep 19, 2026	51-200	84 contacts →
	Partial evidence “Fossil Rim Wildlife Center is dedicated to the conservation of species in peril, conducting scientific research, training of professionals.” Source: RevenueBase Database · checked Sep 19, 2026
21	Zoological Society Of Milwaukee	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 19, 2026	51-200	83 contacts →
	Indirect evidence “The Zoological Society of Milwaukee's mission is to conserve wildlife and endangered species, educate people about the importance of wildlife and the environment, and support the…” Source: RevenueBase Database · checked Sep 19, 2026
22	Bridging The GAP	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	11-50	83 contacts →
	Indirect 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
23	River Partners	Indirect evidence	Chico, CA, United StatesHQ checked Sep 19, 2026	51-200	81 contacts →
	Indirect evidence “River Partners brings life back to rivers.” Source: RevenueBase Database · checked Sep 19, 2026
24	Resources Legacy Fund	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 19, 2026	51-200	77 contacts →
	Indirect evidence “Resources Legacy Fund builds the architecture behind lasting environmental progress.” Source: RevenueBase Database · checked Sep 19, 2026
25	Forest Trends Association	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	76 contacts →
	Indirect evidence “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…” 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: biodiversity conservation 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 biodiversity conservation nonprofits.
Partial evidence: Its own public description names part of biodiversity conservation nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name biodiversity conservation 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 651 biodiversity conservation nonprofits based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,397 reachable decision-makers.

Free signup · no credit card

View the full list →

Biodiversity conservation nonprofits based in the United States at a glance

As of Sep 19, 2026

34.2%Verified-email coverage

33.2Average contacts per company

1-10Median size (employees)

3.2%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

449

11-50

140

51-200

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 651 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 biodiversity conservation 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 “biodiversity conservation 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 biodiversity conservation 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 biodiversity conservation 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, 7,397 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 biodiversity conservation 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 biodiversity conservation nonprofits are there based in the United States?

RevenueBase identified 651 biodiversity conservation 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 biodiversity conservation nonprofits?

Washington leads with 21 headquartered companies, followed by New York (16) and San Francisco (13).

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 7,397 verified decision-maker contacts tracked across these 651 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.

Ready to reach these companies? Verified emails and direct dials for all 651 biodiversity conservation nonprofits based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Biodiversity conservation nonprofits by geography

Browse the directory

Browse: Companies home · All United States lists · All Biodiversity conservation nonprofits lists · New lists

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.