Company lists · Data refreshed September 2026
Top 25 Environmental nonprofits based in Denver, United States
RevenueBase identified 66 environmental nonprofits headquartered in Denver, United States as of September 2026 and tracks 709 professional contacts across them, including 220 with verified work emails. Washington is the largest hub.
This list covers environmental nonprofits headquartered in Denver, 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.
The 25 largest environmental nonprofits based in Denver, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 114 contacts → | ||||
Indirect evidence “The Public Interest Network runs organizations committed to our vision of a better world, a set of core values, and a strategic approach to getting things done.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 93 contacts → | ||||
Indirect evidence “Every day, we see more heartbreaking evidence of the damage being done to our planet: climate change, plastic pollution, wildlife disappearing forever.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 79 contacts → | ||||
Indirect evidence “PIRG is an advocate for the public interest.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 62 contacts → | ||||
Partial evidence “Today, the state of our environment is a household issue: global warming is in the news every day, students across the country are rallying to green their campuses, celebrities…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 42 contacts → | ||||
Indirect evidence “The Future Is Worth The Fight.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 30 contacts → | ||||
Indirect evidence “Earth Force is a national non profit with over 30 years of experience partnering with school districts, youth-serving organizations, and educators to evolve student learning…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 contacts → | ||||
Partial evidence “The Park People is a private 501(c)(3) nonprofit organization that works to preserve, enhance, and advocate for Denver’s parks, recreation resources, open space, and urban forest.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 19 contacts → | ||||
Indirect evidence “Volunteers for Outdoor Colorado (VOC) is the state's oldest and largest outdoor stewardship organization.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 18 contacts → | ||||
Indirect evidence “Cottonwood Institute (CI) is an award-winning educational non-profit organization based in Denver, Colorado.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 17 contacts → | ||||
Indirect evidence “COCO's mission is to advance healthy and resilient communities through collaborative conservation and restoration.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 10 contacts → | ||||
Indirect evidence “Our mission is to protect, connect, and restore wildlife and wildlands in the southern Rocky Mountain region.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 8 contacts → | ||||
Partial evidence “Environment Colorado is a policy and action group with one mission: to build a greener, healthier world.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 7 contacts → | ||||
Partial evidence “We support the many types of educators who teach concepts we all need to understand: how natural systems work, what we must do to interact responsibly with the environment, and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 contacts → | ||||
Partial evidence “Helping environmental organizations and sustainability-focused business achieve community and environmental goals through environmental social science and diversity, equity, and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 7 contacts → | ||||
Partial evidence “IES is a non profit committed to finding scientific solutions for environmental problems.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 6 contacts → | ||||
Indirect evidence “The Center for Western Priorities is a Denver-based nonpartisan conservation organization that serves as a source of accurate information, promotes responsible policies and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 6 contacts → | ||||
Indirect evidence “We've seen the future and it's way better!” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 5 contacts → | ||||
Indirect evidence “We believe that healthy soils, sustainable food systems and the people who work within them are the capital of our planet's future.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 5 contacts → | ||||
Partial evidence “With a mission to unify the well-being of people, animals, and the environment, our foundational principle is the fact that we cannot advance the causes of animal protection and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 contacts → | ||||
Indirect evidence “The Colorado Sierra Club is a powerful collective of more than grassroots changemakers working together across the state to advance climate solutions, act for justice, get…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Partial evidence “At Environmental and Animal Defense, our mission is to provide the Denver and Colorado Front Range community with legal services for environmental and animal issues.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 contacts → | ||||
Partial evidence “A place for ALL women and allies who are passionate about environmental sustainability.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 contacts → | ||||
Indirect evidence “Created in 2015, CLP is building change with youth across the spectrum, educators, and communities by learning to see where we consume resources and how we produce waste so that…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2 contacts → | ||||
Indirect evidence “We believe nature is an asset.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Indirect evidence “The Big SandBox strives to mobilize urban communities around green infrastructure and produce meaningful community spaces: schoolyards, urban parks and other places.” Source: RevenueBase Database · checked Sep 19, 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: environmental 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 environmental nonprofits.
- Partial evidence
- Its own public description names part of environmental nonprofits, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name environmental 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 66 environmental nonprofits based in Denver, United States
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Environmental nonprofits based in Denver, United States at a glance
As of Sep 19, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Denver, so it is reported there. Company counts and contact totals on this page are exact for Denver, over 66 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 environmental 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 Denver, United States whose own description of what they do matches “environmental 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 environmental 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 environmental nonprofits, and records with no verified work email. Companies headquartered outside Denver 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, 220 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.
Environmental nonprofits by metro in the United States
- Environmental nonprofits in Washington195
- Environmental nonprofits in New York194
- Environmental nonprofits in San Francisco126
- Environmental nonprofits in Los Angeles117
- Environmental nonprofits in Portland94
- Environmental nonprofits in Seattle88
- Environmental nonprofits in Atlanta67
- Environmental nonprofits in Denver66
- Environmental nonprofits in Miami58
- Environmental nonprofits in San Diego58
- Environmental nonprofits in Boston55
- Environmental nonprofits in Austin53
- Environmental nonprofits in Chicago50
- Environmental nonprofits in Oakland47
- Environmental nonprofits in Houston44
- Environmental nonprofits in Boulder42
- Environmental nonprofits in Philadelphia36
- Environmental nonprofits in Minneapolis34
- Environmental nonprofits in Sacramento29
- Environmental nonprofits in Berkeley28
- Environmental nonprofits in Pittsburgh28
- Environmental nonprofits in Richmond27
- Environmental nonprofits in Honolulu26
- Environmental nonprofits in Madison26
- Environmental nonprofits in Raleigh26
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 environmental 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 environmental nonprofits are there based in Denver, United States?
RevenueBase identified 66 environmental nonprofits headquartered in Denver, 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 Public Interest Network, headquartered in Denver, tops this list with the largest team on record.
Which city has the most environmental nonprofits?
Washington leads with 195 headquartered companies, followed by New York (194) and San Francisco (126).
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 220 verified decision-maker contacts tracked across these 66 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.
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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.
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