Company lists · Data refreshed September 2026

Top 25 Environmental organizations based in Oakland, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 48 companies tracked

RevenueBase identified 48 environmental organizations headquartered in Oakland, United States as of September 2026 and tracks 1,689 professional contacts across them, including 725 with verified work emails. Washington is the largest hub.

This list covers environmental organizations headquartered in Oakland, 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

48Companies

1,689Contacts tracked

725Verified emails

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The 25 largest environmental organizations based in Oakland, United States

Ranked by team size

Top 25 of 48 environmental organizations based in Oakland, 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	Sierra Club	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	501-1,000	1,069 contacts →
	Indirect evidence “At the Sierra Club, we believe in the power of togetherness.” Source: RevenueBase Database · checked Sep 19, 2026
2	Trellis Group	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	51-200	67 contacts →
	Indirect evidence “Trellis Group, formerly GreenBiz Group, empowers professional communities to confront the climate crisis while building a regenerative, prosperous and just economy that supports…” Source: RevenueBase Database · checked Sep 19, 2026
3	California Environmental Voters	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	58 contacts →
	Strong evidence “California Environmental Voters (EnviroVoters) exists to build the political power to solve the climate crisis, advance justice, and create a roadmap for global action.” Source: RevenueBase Database · checked Sep 19, 2026
4	Circlepoint	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	47 contacts →
	Indirect evidence “At Circlepoint, we are committed to helping our clients solve the challenges of today.” Source: RevenueBase Database · checked Sep 19, 2026
5	Asian Pacific Environmental Network	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	37 contacts →
	Strong evidence “All people have a right to a clean and healthy environment in which their communities can live, work, learn, play and thrive.” Source: RevenueBase Database · checked Sep 19, 2026
6	watttime.org	Strong evidence	Oakland, United StatesHQ checked Sep 19, 2026	11-50	35 contacts →
	Strong evidence “WattTime is an environmental tech nonprofit that empowers all people, companies, policymakers, and countries to slash emissions and choose cleaner energy.” Source: RevenueBase Database · checked Sep 19, 2026
7	Center For Environmental Health	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Strong evidence “We envision a world where everyone lives, works, learns and plays in a healthy environment; we protect people from toxic chemicals by working with communities, businesses, and the…” Source: RevenueBase Database · checked Sep 19, 2026
8	Rose Foundation For Communities And The Environment	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	30 contacts →
	Strong evidence “The Rose Foundation envisions a future where nature is protected, people’s rights are ensured, and environmental justice is advanced, and where these three values are deeply…” Source: RevenueBase Database · checked Sep 19, 2026
9	International Rivers	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	26 contacts →
	Indirect evidence “International Rivers' mission is to protect rivers and defend the rights of communities that depend on them.” Source: RevenueBase Database · checked Sep 19, 2026
10	California Environmental Justice Alliance	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Strong evidence “The California Environmental Justice Alliance is a statewide, community-led alliance that works to achieve environmental justice by advancing policy solutions.” Source: RevenueBase Database · checked Sep 19, 2026
11	Olofson Environmental, INC	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
12	SAN Francisco Baykeeper	Indirect evidence	Oakland, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence “San Francisco Baykeeper has defended the Bay since 1989.” Source: RevenueBase Database · checked Sep 19, 2026
13	Sierra Club Foundation	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “The Sierra Club Foundation promotes climate solutions, conservation, and movement building through a powerful combination of strategic philanthropy and grassroots advocacy.” Source: RevenueBase Database · checked Sep 19, 2026
14	Climate Action California	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	17 contacts →
	Indirect evidence “Climate Action California has grown out of 350 Silicon Valley’s Legislation/Policy team’s work in recent years to include individuals and groups from around our state.” Source: RevenueBase Database · checked Sep 19, 2026
15	BAY Area Green Tours, 501 C 3	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Bay Area Green Tours provides educational tours and events that demonstrate the sustainable economy in action, inspire support of local green businesses, and empower people to…” Source: RevenueBase Database · checked Sep 19, 2026
16	Restore Native Plants	Indirect evidence	Oakland, NJ, United StatesHQ checked Sep 19, 2026	1-10	12 contacts →
	Indirect evidence “Restore Native Plants is an innovative team focused on restoring the region’s native plant and animal species – many of which have become threatened and endangered.” Source: RevenueBase Database · checked Sep 19, 2026
17	Calwild	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “CalWild protects and restores the state’s wildest natural landscapes and watersheds on public lands.” Source: RevenueBase Database · checked Sep 19, 2026
18	Lozeau Drury LLP	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	11-50	8 contacts →
	Strong evidence “We are a boutique environmental law firm representing non-profit environmental and recreational groups, labor organizations, neighborhood associations, and Indian tribes in their…” Source: RevenueBase Database · checked Sep 19, 2026
19	Gigantic Idea Studio	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence “Gigantic Idea Studio, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
20	California Interfaith Power & Light	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “Welcome to California Interfaith Power & Light, the originator of the Interfaith Power & Light campaign that began in and now has 40 state affiliates.” Source: RevenueBase Database · checked Sep 19, 2026
21	WEAD	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “MISSION STATEMENT Focusing on women’s unique perspectives we collaborate internationally to further the field and understanding of ecological and social justice art.” Source: RevenueBase Database · checked Sep 19, 2026
22	Stop The Money Pipeline	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	4 contacts →
	Indirect evidence “We're going after the root cause of the #climatecrisis: Wall Street’s financing of fossil fuels.” Source: RevenueBase Database · checked Sep 19, 2026
23	Greenbiz Group	Strong evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	51-200	4 contacts →
	Strong evidence “GreenBiz Group is a media and events company that views climate change and other global environmental challenges as existential threats to business and society, as well as…” Source: RevenueBase Database · checked Sep 19, 2026
24	Critical Ecology LAB	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	4 contacts →
	Indirect evidence “For centuries, the exploitation of land and labor–from cotton plantations to oil fields–has laid the groundwork for today’s climate crisis.” Source: RevenueBase Database · checked Sep 19, 2026
25	Keep Oakland Beautiful	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	1-10	4 contacts →
	Indirect evidence “Keep Oakland Beautiful (KOB) is a non-profit organization and an affiliate of Keep America Beautiful.” 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 48 environmental organizations based in Oakland, United States

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Environmental organizations based in Oakland, United States at a glance

As of Sep 19, 2026

42.9%Verified-email coverage

35.2Average contacts per company

1-10Median size (employees)

435.4%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for Oakland, so it is reported there. Company counts and contact totals on this page are exact for Oakland, over 48 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 Oakland, 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 Oakland 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, 725 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 Oakland, United States?

RevenueBase identified 48 environmental organizations headquartered in Oakland, 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?

Sierra Club, headquartered in Oakland, 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 725 verified decision-maker contacts tracked across these 48 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.