Company lists · Data refreshed September 2026

Top 25 Sustainable development nonprofits based in the United States

Name: Sustainable development 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 22, 2026 1,568 companies tracked

RevenueBase identified 1,568 company matches for sustainable development nonprofits associated with the United States as of September 2026 and tracks 31,058 professional contacts across them, including 9,221 with verified work emails. New York is the largest hub.

This list covers company matches for sustainable development 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 22, 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 22, 2026 How this list was built

1,568Companies

31,058Contacts tracked

9,221Verified emails

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The 25 largest sustainable development nonprofits based in the United States

Ranked by team size

Top 25 of 1,568 company matches for sustainable development nonprofits based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 22, 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 22, 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 22, 2026 · View company records in RevenueBase
2	Conservation International	Exact match	Arlington, VA, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
3	Environmental Defense Fund	Exact match	New York, NY, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
4	Winrock International	Exact match	Little Rock, AR, United StatesHQ recorded Sep 22, 2026	201-500	1,166 contacts →
	Exact match “Winrock is a recognized leader in U.S.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
5	Casa Familiar	Exact match	Albuquerque, NM, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
6	Student Conservation Association	Exact match	Arlington, VA, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
7	Mass Audubon	Exact match	Lincoln, MA, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
8	The Providencia Group	Exact match	Ashburn, VA, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
9	RARE	Exact match	Arlington, VA, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
10	IFAW	Exact match	Washington, DC, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
11	Better Earth	Exact match	Tampa, FL, United StatesHQ recorded Sep 22, 2026	201-500	244 contacts →
	Exact match “We are creating a more sustainable and better earth through solar energy.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
12	Ceres, INC	Exact match	Boston, MA, United StatesHQ recorded Sep 22, 2026	51-200	241 contacts →
	Exact match “Ceres is a nonprofit advocacy organization working to accelerate the transition to a cleaner, more just, and resilient world.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
13	Seaside Sustainability	Exact match	Gloucester, MA, United StatesHQ recorded Sep 22, 2026	51-200	240 contacts →
	Exact match “Seaside Sustainability is a nationally recognized, award-winning 501(c)3 charitable organization dedicated to community engagement, education and environmental conservation.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
14	The Conservation Fund	Exact match	Arlington, VA, United StatesHQ recorded Sep 22, 2026	201-500	224 contacts →
	Exact match “We are in the business of conservation, creating innovative solutions that drive nature-based action for climate protection, sustainable economies and vibrant communities.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
15	Conservation Corps Minnesota & Iowa	Exact match	St. Paul, MN, United StatesHQ recorded Sep 22, 2026	201-500	207 contacts →
	Exact match “At Conservation Corps Minnesota & Iowa, youth and young adults grow as environmental stewards and leaders while giving back to the community through meaningful service.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
16	Grownyc	Exact match	New York, NY, United StatesHQ recorded Sep 22, 2026	51-200	185 contacts →
	Exact match “GrowNYC is a hands-on non-profit with a mission to empower all New Yorkers with equitable access to fresh, locally grown food and neighborhood green spaces, reduce waste, and care…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
17	Goodwill Of The Finger Lakes	Exact match	Rochester, NY, United StatesHQ recorded Sep 22, 2026	501-1,000	154 contacts →
	Exact match “Elevating people, community, and planet for a good today and better tomorrow.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
18	Seeds Ecology & Education Centers	Exact match	Traverse City, MI, United StatesHQ recorded Sep 22, 2026	51-200	146 contacts →
	Exact match “We are a 501c3 nonprofit organization established to foster local solutions to global issues.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
19	earthday.org	Exact match	Washington, DC, United StatesHQ recorded Sep 22, 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 22, 2026 · View company records in RevenueBase
20	Ecology Action	Exact match	Santa Cruz, CA, United StatesHQ recorded Sep 22, 2026	51-200	140 contacts →
	Exact match “Ecology Action is an award-winning California 501(c)(3) non-profit that’s been inspiring sustainable community actions since 1970.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
21	Treepeople	Exact match	Beverly Hills, CA, United StatesHQ recorded Sep 22, 2026	51-200	136 contacts →
	Exact match “As the Los Angeles region faces severe impacts from climate change, TreePeople unites the power of trees, people and nature-based solutions to grow a more climate-ready city.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
22	Eden People Planet	Exact match	Murrieta, CA, United StatesHQ recorded Sep 22, 2026	11-50	131 contacts →
	Exact match “Eden: People+Planet is a global 501(c)(3) nonprofit organization focused on landscape restoration and conservation through community partnerships.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
23	KUPU	Exact match	Honolulu, HI, United StatesHQ recorded Sep 22, 2026	51-200	127 contacts →
	Exact match “Much like the Kupukupu Fern, which is one of the first plants to bring life back to the land after a devastating lava flow, Kupu’s heart is to bring life back to the people, land…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
24	Earthwatch Institute	Exact match	Boston, MA, United StatesHQ recorded Sep 22, 2026	n/a	100 contacts →
	Exact match “Earthwatch Institute is focused on expanding access to hands-on science education.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
25	Solar ONE	Exact match	Long Island City, NY, United StatesHQ recorded Sep 22, 2026	51-200	99 contacts →
	Exact match “Solar One is a non-profit, environmental education organization that fosters sustainable practices and environmental equity across New York City.” Recorded in the RevenueBase company graph · Sep 22, 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 “sustainable development 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 1,568 sustainable development nonprofits based in the United States

See the full list, filter by size, metro and specialty, and access 9,221 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainable development nonprofits based in the United States at a glance

As of Sep 22, 2026

29.7%Verified-email coverage

19.8Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

1,125

11-50

314

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 1,568 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 “sustainable development 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 9,221 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 22, 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.

Sustainable development 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 “sustainable development nonprofits”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable development nonprofits are there based in the United States?

RevenueBase identified 1,568 company matches for sustainable development 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 sustainable development nonprofits?

New York leads with 75 company records, followed by Washington (53) and Los Angeles (42).

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 9,221 professional contacts with verified work emails tracked across these 1,568 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 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 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.