Company lists · Data refreshed September 2026

Top 25 Environmental organizations based in Denver, United States

Name: Environmental organizations based in Denver, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 81 companies tracked

RevenueBase identified 81 environmental organizations headquartered in Denver, United States as of September 2026 and tracks 858 professional contacts across them, including 327 with verified work emails. Washington is the largest hub.

This list covers environmental organizations 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

81Companies

858Contacts tracked

327Verified emails

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The 25 largest environmental organizations based in Denver, United States

Ranked by team size

Top 25 of 81 environmental organizations based in Denver, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental 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 Public Interest Network	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	201-500	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, 2026
2	National Environmental Health Association Neha	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	107 contacts →
	Strong evidence “The National Environmental Health Association (NEHA) supports thousands of members who are committed to ensuring that the air we breathe, the food we eat, the water we drink and…” Source: RevenueBase Database · checked Sep 19, 2026
3	Environment America	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
4	Green Corps	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	62 contacts →
	Strong 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, 2026
5	Spheros Environmental	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	201-500	48 contacts →
	Strong evidence “Environmental insight for complex real-world decisions Spheros Environmental helps clients make clear, defensible decisions in complex environments.” Source: RevenueBase Database · checked Sep 19, 2026
6	Conservation Colorado	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	42 contacts →
	Indirect evidence “The Future Is Worth The Fight.” Source: RevenueBase Database · checked Sep 19, 2026
7	Quandary Consultants	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	51-200	40 contacts →
	Strong evidence “Quandary Consultants, LLC (QC) is an environmental and regulatory consulting company.” Source: RevenueBase Database · checked Sep 19, 2026
8	Earth Force	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	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, 2026
9	Volunteers For Outdoor Colorado VOC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
10	Cottonwood Institute	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	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, 2026
11	Coalitions & Collaboratives	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
12	The Alliance For Collective Action	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “We bring people together to develop and advance solutions for a thriving planet.” Source: RevenueBase Database · checked Sep 19, 2026
13	Rocky Mountain Wild	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	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, 2026
14	The Fresh Ideas Group	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Indirect evidence “FIG is a fiercely distinct communications agency.” Source: RevenueBase Database · checked Sep 19, 2026
15	Environment Colorado	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	51-200	8 contacts →
	Strong evidence “Environment Colorado is a policy and action group with one mission: to build a greener, healthier world.” Source: RevenueBase Database · checked Sep 19, 2026
16	Colorado Alliance For Environmental Education	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Strong 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, 2026
17	Lacy Consulting Services, LLC	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Strong 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, 2026
18	Institute For Environmental Solutions	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	7 contacts →
	Strong evidence “IES is a non profit committed to finding scientific solutions for environmental problems.” Source: RevenueBase Database · checked Sep 19, 2026
19	Center For Western Priorities	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	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, 2026
20	Kastlfel	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	6 contacts →
	Indirect evidence “We've seen the future and it's way better!” Source: RevenueBase Database · checked Sep 19, 2026
21	FINCH	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence “Finch is a resource hub for everything sustainability.” Source: RevenueBase Database · checked Sep 19, 2026
22	Alliance For Human Animal Coexistence	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Strong 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, 2026
23	Canopy Edge	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	11-50	4 contacts →
	Indirect evidence “Canopy Edge is a global management consulting firm that provides clients with the strategic advice and tools needed to navigate and excel in the Net Zero corporate sustainability…” Source: RevenueBase Database · checked Sep 19, 2026
24	Colorado Sierra Club	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	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, 2026
25	Environmental And Animal Defense	Strong evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	1-10	3 contacts →
	Strong 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, 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: environmental 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 environmental organizations.
Partial evidence: Its own public description names part of environmental organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental 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 81 environmental organizations based in Denver, United States

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Environmental organizations based in Denver, United States at a glance

As of Sep 19, 2026

38.1%Verified-email coverage

10.6Average contacts per company

1-10Median size (employees)

258.0%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 81 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 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 Denver, United States whose own description of what they do matches “environmental 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 environmental 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 environmental organizations, 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, 327 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 organizations by metro in the United States

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 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 environmental organizations are there based in Denver, United States?

RevenueBase identified 81 environmental organizations 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 organizations?

Washington leads with 209 headquartered companies, followed by New York (204) and Los Angeles (133).

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 327 verified decision-maker contacts tracked across these 81 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.