Company lists · Data refreshed September 2026
Top 25 Marine conservation nonprofits based in the United States
RevenueBase identified 433 marine conservation nonprofits headquartered in the United States as of September 2026 and tracks 12,434 professional contacts across them, including 3,731 with verified work emails. Miami is the largest hub.
This list covers marine 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 20, 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 marine conservation nonprofits based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 3,663 contacts → | ||||
Indirect evidence “WCS stands for wildlife and wild places.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 738 contacts → | ||||
Strong evidence “The mission of the nonprofit Monterey Bay Aquarium is to inspire conservation of the ocean.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 453 contacts → | ||||
Strong evidence “Founded in 1955, Mote Marine Laboratory & Aquarium is an independent, nonprofit 501(c)3 research organization based in Sarasota, Fla, with additional field stations in eastern…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 438 contacts → | ||||
Strong evidence “The New England Aquarium is a catalyst for global change through public engagement, commitment to marine animal conservation, leadership in education, innovative scientific…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 425 contacts → | ||||
Partial evidence “We are a private nonprofit organization whose mission is to connect people with nature to inspire compassion and care for our ocean planet!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 328 contacts → | ||||
Indirect evidence “The Surfrider Foundation is a 501(c)3 non-profit organization dedicated to the protection and enjoyment of our world’s ocean, waves and beaches.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 302 contacts → | ||||
Partial evidence “The Florida Aquarium actively participates in and promotes stewardship of the natural environment as part of our mission of conservation.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 272 contacts → | ||||
Partial evidence “The Seattle Aquarium is a nonprofit Aquarium committed to Earth’s one ocean.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 256 contacts → | ||||
Partial evidence “OUR MISSION: We believe in preserving our environment while inspiring the human spirit through leadership in the rescue, rehabilitation, and release of marine life; environmental…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 227 contacts → | ||||
Indirect evidence “Our ocean is truly awesome-but it is not invincible.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 191 contacts → | ||||
Indirect evidence “Pacific Whale Foundation is a non-profit organization founded in 1980 to save whales from extinction.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 135 contacts → | ||||
Indirect evidence “OceanX is a mission to explore the unseen ocean, map uncharted areas of the world, observe rare deep-sea creatures, pursue scientific and medical breakthroughs, and then bring all…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 130 contacts → | ||||
Indirect evidence “Global Fishing Watch is an international non-profit organization committed to advancing the sustainability of our oceans through increased transparency.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 122 contacts → | ||||
Indirect evidence “The Gulf of Maine Research Institute (GMRI) pioneers collaborative solutions to global ocean challenges.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 103 contacts → | ||||
Strong evidence “Loggerhead Marinelife Center is a nonprofit sea turtle hospital that promotes the conservation of ocean ecosystems with a special focus on sea turtles.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 96 contacts → | ||||
Partial evidence “Coral Restoration Foundation™ is a 501(c)(3) non-profit ocean conservation organization based in Key Largo, Florida.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 88 contacts → | ||||
Strong evidence “The National Marine Mammal Foundation is a 501(c)3 nonprofit organization with a mission to improve and protect life for all marine mammals, humans, and our shared oceans by…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 86 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 85 contacts → | ||||
Strong 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 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 60 contacts → | ||||
Partial evidence “The Oregon Coast Aquarium is a 501(c)3 nonprofit organization located in Newport, on the beautiful Oregon Coast.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 57 contacts → | ||||
Indirect evidence “Oceanic Global inspires us to care deeply for the ocean and provides solutions to protect it.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 53 contacts → | ||||
Indirect evidence “For more than 35 years, Rainforest Trust has not wavered from its mission of preventing deforestation, preserving critical habitat and safeguarding endangered species.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 53 contacts → | ||||
Partial evidence “Hubbs-SeaWorld Research Institute (HSWRI) is a non-profit scientific research organization committed to conserving and renewing marine life to ensure a healthier planet.” Source: RevenueBase Database · checked Sep 20, 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: marine 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 marine conservation nonprofits.
- Partial evidence
- Its own public description names part of marine conservation nonprofits, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name marine 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 433 marine conservation nonprofits based in the United States
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Marine conservation nonprofits based in the United States at a glance
As of Sep 20, 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 433 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 marine 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 “marine 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 marine 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 marine 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, 3,731 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 20, 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 marine 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 marine conservation nonprofits are there based in the United States?
RevenueBase identified 433 marine 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?
Wildlife Conservation Society, headquartered in Bronx, tops this list with the largest team on record.
Which city has the most marine conservation nonprofits?
Miami leads with 14 headquartered companies, followed by San Diego (13) and San Francisco (12).
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 3,731 verified decision-maker contacts tracked across these 433 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 20, 2026.
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Marine conservation nonprofits by geography
- Marine conservation nonprofits based in Australia
- Marine conservation nonprofits based in Brazil
- Marine conservation nonprofits based in Canada
- Marine conservation nonprofits based in France
- Marine conservation nonprofits based in Indonesia
- Marine conservation nonprofits based in Italy
- Marine conservation nonprofits based in Mexico
- Marine conservation nonprofits based in the Netherlands
- Marine conservation nonprofits based in Portugal
- Marine conservation nonprofits based in South Africa
- Marine conservation nonprofits based in Spain
- Marine conservation nonprofits based in the United Kingdom
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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- Marine conservation nonprofits based in Australia
- Marine conservation nonprofits based in Brazil
- Marine conservation nonprofits based in Canada
- Marine conservation nonprofits based in France
- Marine conservation nonprofits based in Indonesia
- Marine conservation nonprofits based in Italy