Company lists · Data refreshed September 2026

Top 25 Wildlife conservation organizations based in the United States

Name: Wildlife conservation organizations based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 868 companies tracked

RevenueBase identified 868 wildlife conservation organizations headquartered in the United States as of September 2026 and tracks 37,931 professional contacts across them, including 12,162 with verified work emails. Washington is the largest hub.

This list covers wildlife conservation organizations 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 22, 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 22, 2026 86% judged on-target in blind review

868Companies

37,931Contacts tracked

12,162Verified emails

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The 25 largest wildlife conservation organizations based in the United States

Ranked by team size

Top 25 of 868 wildlife conservation organizations based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to wildlife conservation organizations: 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 22, 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 22, 2026
2	Wildlife Conservation Society	Partial evidence	Bronx, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	3,663 contacts →
	Partial evidence “WCS stands for wildlife and wild places.” Source: RevenueBase Database · checked Sep 22, 2026
3	World Wildlife Fund	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,290 contacts →
	Partial evidence “Our planet faces many big conservation challenges.” Source: RevenueBase Database · checked Sep 22, 2026
4	Natural Resources Defense Council Nrdc	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	501-1,000	942 contacts →
	Indirect evidence “NRDC is the nation's most effective environmental action organization.” Source: RevenueBase Database · checked Sep 22, 2026
5	Florida Fish & Wildlife Conservation Commission	Partial evidence	Tallahassee, FL, United StatesHQ checked Sep 22, 2026	1,001-5,000	904 contacts →
	Partial evidence “Mission: Managing fish and wildlife resources for their long-term well-being and the benefit of people.” Source: RevenueBase Database · checked Sep 22, 2026
6	National Audubon Society	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 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 22, 2026
7	National Wildlife Federation	Strong evidence	Reston, VA, United StatesHQ checked Sep 22, 2026	201-500	585 contacts →
	Strong 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 22, 2026
8	Mass Audubon	Partial evidence	Lincoln, MA, United StatesHQ checked Sep 22, 2026	201-500	554 contacts →
	Partial evidence “Mass Audubon is the largest nature-based conservation organization in New England.” Source: RevenueBase Database · checked Sep 22, 2026
9	ZOO Atlanta	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 22, 2026	201-500	500 contacts →
	Partial evidence “Vision We envision a world where wildlife and humans flourish together.” Source: RevenueBase Database · checked Sep 22, 2026
10	Brookfield ZOO Chicago	Strong evidence	Brookfield, IL, United StatesHQ checked Sep 22, 2026	501-1,000	441 contacts →
	Strong evidence “The mission of Brookfield Zoo Chicago is to inspire conservation leadership by connecting people to wildlife and nature.” Source: RevenueBase Database · checked Sep 22, 2026
11	Denver ZOO Conservation Alliance	Strong evidence	Denver, CO, United StatesHQ checked Sep 22, 2026	201-500	413 contacts →
	Strong evidence “For 129 years, Denver Zoo Conservation Alliance has connected people with wildlife.” Source: RevenueBase Database · checked Sep 22, 2026
12	SAN Antonio ZOO	Partial evidence	San Antonio, United StatesHQ checked Sep 22, 2026	501-1,000	356 contacts →
	Partial evidence “San Antonio Zoo® is a non-profit 501(c)(3) organization committed to securing a future for wildlife.” Source: RevenueBase Database · checked Sep 22, 2026
13	Dallas ZOO	Indirect evidence	Dallas, United StatesHQ checked Sep 22, 2026	201-500	285 contacts →
	Indirect evidence “The Dallas Zoo, established in is the largest zoological experience in Texas.” Source: RevenueBase Database · checked Sep 22, 2026
14	Oregon ZOO	Partial evidence	Portland, OR, United StatesHQ checked Sep 22, 2026	201-500	255 contacts →
	Partial evidence “The Oregon Zoo connects communities to the wonder of wildlife to create a better future for all.” Source: RevenueBase Database · checked Sep 22, 2026
15	National Fish And Wildlife Foundation	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	252 contacts →
	Strong 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 22, 2026
16	The Jane Goodall Institute	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	201-500	232 contacts →
	Partial evidence “The Jane Goodall Institute is a global, community-led conservation organization founded in 1977 that advances the vision and work of Dr.” Source: RevenueBase Database · checked Sep 22, 2026
17	Center For Biological Diversity	Indirect evidence	Tucson, AZ, United StatesHQ checked Sep 22, 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 22, 2026
18	Panthera	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	51-200	218 contacts →
	Partial evidence “Founded in 2006, Panthera is devoted to the conservation of the world’s 40 species of wild cats and the vast ecosystems they inhabit.” Source: RevenueBase Database · checked Sep 22, 2026
19	Brevard ZOO	Partial evidence	Melbourne, FL, United StatesHQ checked Sep 22, 2026	51-200	215 contacts →
	Partial evidence “Brevard Zoo's mission is “we share our joy of nature to help people and wildlife thrive.” To support that mission, we focus on providing world-class care to our animals, offering…” Source: RevenueBase Database · checked Sep 22, 2026
20	Defenders Of Wildlife	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	202 contacts →
	Partial evidence “Defenders of Wildlife is dedicated to the protection of all native animals and plants in their natural communities.” Source: RevenueBase Database · checked Sep 22, 2026
21	The Wilderness Society	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	199 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026
22	Wildlife Works	Strong evidence	Mill Valley, CA, United StatesHQ checked Sep 22, 2026	201-500	188 contacts →
	Strong 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 22, 2026
23	SEA Shepherd Conservation Society	Strong evidence	Alexandria, VA, United StatesHQ checked Sep 22, 2026	n/a	183 contacts →
	Strong evidence “Established in 1977, Sea Shepherd Conservation Society (SSCS) is an international non-profit, marine wildlife conservation organization.” Source: RevenueBase Database · checked Sep 22, 2026
24	Rocky Mountain ELK Foundation	Strong evidence	Missoula, MT, United StatesHQ checked Sep 22, 2026	51-200	178 contacts →
	Strong evidence “RMEF is a wildlife conservation organization with a mission of ensuring the future of elk, other wildlife, their habitat and our hunting heritage.” Source: RevenueBase Database · checked Sep 22, 2026
25	Memphis ZOO	Strong evidence	Memphis, TN, United StatesHQ checked Sep 22, 2026	201-500	173 contacts →
	Strong evidence “Our vision is to be one of the world's best Zoos by preserving wildlife through education, conservation, and research.” Source: RevenueBase Database · checked Sep 22, 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: wildlife conservation organizations. 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 wildlife conservation organizations.
Partial evidence: Its own public description names part of wildlife conservation organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wildlife conservation organizations. 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 868 wildlife conservation organizations based in the United States

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Wildlife conservation organizations based in the United States at a glance

As of Sep 22, 2026

32.1%Verified-email coverage

43.7Average contacts per company

1-10Median size (employees)

3.3%Largest-city concentration · Washington

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

590

11-50

182

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 868 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 wildlife conservation organizations, 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 “wildlife conservation organizations”. 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 wildlife conservation organizations), 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 wildlife conservation organizations, 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, 12,162 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 22, 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.

Wildlife conservation organizations by metro

Wildlife conservation organizations in Washington29
Wildlife conservation organizations in New York27

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 wildlife conservation organizations, 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 wildlife conservation organizations are there based in the United States?

RevenueBase identified 868 wildlife conservation organizations 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 wildlife conservation organizations?

Washington leads with 29 headquartered companies, followed by New York (27) and Denver (11).

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 12,162 verified decision-maker contacts tracked across these 868 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 22, 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.