Company lists · Data refreshed September 2026
Top 25 Sustainable development nonprofits based in the United States
RevenueBase identified 1,568 sustainable development nonprofits headquartered in 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 sustainable development 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 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.
The 25 largest sustainable development nonprofits based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 6,526 contacts → | ||||
Indirect evidence “Air, water, food, shelter, income: nature sustains every aspect of our lives.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,560 contacts → | ||||
Indirect evidence “Since 1987, Conservation International has worked to spotlight and secure the critical benefits that nature provides to humanity.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,352 contacts → | ||||
Partial evidence “We are Environmental Defense Fund, a leading environmental nonprofit focused on stabilizing the climate while helping build strong and healthy communities.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,166 contacts → | ||||
Indirect evidence “Winrock is a recognized leader in U.S.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,132 contacts → | ||||
Indirect evidence “Casa Familiar is a primary/secondary education company based out of 501 Atrisco Dr Sw, Albuquerque, New Mexico, United States.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 6 | 795 contacts → | ||||
Indirect evidence “The Student Conservation Association (SCA) is the largest provider of hands-on environmental conservation programs for youth and adults.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 7 | 554 contacts → | ||||
Indirect evidence “Mass Audubon is the largest nature-based conservation organization in New England.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 8 | 444 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 9 | 368 contacts → | ||||
Indirect evidence “Rare is a global leader in driving social change for people and nature.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 10 | 355 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 11 | 244 contacts → | ||||
Partial evidence “We are creating a more sustainable and better earth through solar energy.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 12 | 241 contacts → | ||||
Partial evidence “Ceres is a nonprofit advocacy organization working to accelerate the transition to a cleaner, more just, and resilient world.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 22, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 22, 2026Thanks. The Data Team will review it. | |||||
| 15 | 207 contacts → | ||||
Indirect evidence “At Conservation Corps Minnesota & Iowa, youth and young adults grow as environmental stewards and leaders while giving back to the community through meaningful service.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 16 | 185 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 17 | 154 contacts → | ||||
Indirect evidence “Elevating people, community, and planet for a good today and better tomorrow.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 18 | 146 contacts → | ||||
Partial evidence “We are a 501c3 nonprofit organization established to foster local solutions to global issues.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 19 | 144 contacts → | ||||
Indirect evidence “EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 20 | 140 contacts → | ||||
Partial evidence “Ecology Action is an award-winning California 501(c)(3) non-profit that’s been inspiring sustainable community actions since 1970.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 21 | 136 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 22 | 131 contacts → | ||||
Partial evidence “Eden: People+Planet is a global 501(c)(3) nonprofit organization focused on landscape restoration and conservation through community partnerships.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 23 | 127 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 24 | 100 contacts → | ||||
Indirect evidence “Earthwatch Institute is focused on expanding access to hands-on science education.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 25 | 99 contacts → | ||||
Partial evidence “Solar One is a non-profit, environmental education organization that fosters sustainable practices and environmental equity across New York City.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
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: sustainable development 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 sustainable development nonprofits.
- Partial evidence
- Its own public description names part of sustainable development nonprofits, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name sustainable development 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 1,568 sustainable development nonprofits based in the United States
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Sustainable development nonprofits based in the United States at a glance
As of Sep 22, 2026Companies by employee count
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
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among sustainable development 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 “sustainable development 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 sustainable development 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 sustainable development 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, 9,221 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.
Sustainable development nonprofits by metro
- Sustainable development nonprofits in New York64
- Sustainable development nonprofits in Washington53
- Sustainable development nonprofits in Los Angeles42
- Sustainable development nonprofits in San Francisco32
- Sustainable development nonprofits in Miami30
- Sustainable development nonprofits in Atlanta28
- Sustainable development nonprofits in Seattle26
- Sustainable development nonprofits in Boston25
- Sustainable development nonprofits in Denver25
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 sustainable development 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 sustainable development nonprofits are there based in the United States?
RevenueBase identified 1,568 sustainable development 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 sustainable development nonprofits?
New York leads with 64 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 9,221 verified decision-maker contacts tracked across these 1,568 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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Sustainable development nonprofits by geography
- Sustainable development nonprofits based in Belo Horizonte, Brazil
- Sustainable development nonprofits based in Rio De Janeiro, Brazil
- Sustainable development nonprofits based in Sao Paulo, Brazil
- Sustainable development nonprofits based in Toronto, Canada
- Sustainable development nonprofits based in Vancouver, Canada
- Sustainable development nonprofits based in Bengaluru, India
- Sustainable development nonprofits based in Mumbai, India
- Sustainable development nonprofits based in New Delhi, India
- Sustainable development nonprofits based in Pune, India
- Sustainable development nonprofits based in Atlanta, United States
- Sustainable development nonprofits based in Denver, United States
- Sustainable development nonprofits based in Los Angeles, United States
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.
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- Sustainable development nonprofits based in Belo Horizonte, Brazil
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- Sustainable development nonprofits based in Sao Paulo, Brazil
- Sustainable development nonprofits based in Toronto, Canada
- Sustainable development nonprofits based in Vancouver, Canada
- Sustainable development nonprofits based in Bengaluru, India