Company lists · Data refreshed September 2026

Top 25 Climate policy consultancies based in Washington, United States

RevenueBase identified 59 company matches for climate policy consultancies associated with Washington, United States as of September 2026 and tracks 408 professional contacts across them, including 212 with verified work emails. Across the United States, Washington is the largest hub for this category.

This list covers company matches for climate policy consultancies associated with Washington, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 27, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 27, 2026 How this list was built
59Companies
408Contacts tracked
212Verified emails
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The 25 largest climate policy consultancies based in Washington, United States

Ranked by team size
Top 25 of 59 company matches for climate policy consultancies based in Washington, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 27, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-5035 contacts →

Exact match

“The Center for Clean Air Policy (CCAP) supports every step of climate action, from ambition to implementation.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
2Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-5033 contacts →

Exact match

“Boundary Stone Partners exists to accelerate the transformative ideas and technologies that will make our world better.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
3Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-5023 contacts →

Exact match

“The Climate Leadership Council (the Council) is a nonprofit think tank dedicated to championing the most effective, fair, and lasting climate solutions.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
4Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-5019 contacts →

Exact match

“The Clark Group is an environmental policy consulting firm that provides a broad range of services to government, private and nonprofit clients.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
5Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-5018 contacts →

Exact match

“At Earth & Water, we are more than lawyers – we’re strategic advisors with unique experience who advance our clients’ interests across a broad range of environmental and business…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
6Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-5014 contacts →

Exact match

“Climate Advisers brings together globally recognized climate thought leaders on US policy and politics, international diplomacy, tropical forests and other nature-based solutions…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
7Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-1014 contacts →

Exact match

“CO2EFFICIENT LLC (COEFFICIENT) was founded in 2017 as a mission-focused Washington, D.C.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
8Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-108 contacts →

Exact match

“Green Strategies Inc.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
9Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-508 contacts →

Exact match

“The Center for Climate Strategies provides high-level support for planning, analysis, and implementation of climate, energy, and economic programs in partnership with government…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
10Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-507 contacts →

Exact match

“We provide services to leaders of organizations that want to plan and implement climate adaptation actions to protect and maximize their investments across their programs…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
11Exact matchWashington, DC, United StatesHQ recorded Sep 27, 202611-507 contacts →

Exact match

“Clima Capital Partners LLC (CLIMA) advises and creates sustainable value for local economies and communities through robust climate finance solutions, managing and mitigating…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
12Exact matchWashington, United StatesHQ recorded Sep 27, 20261-107 contacts →

Exact match

“Green Capitol LLC works on sustainable development policy at the state, federal and international levels, serving clients on agriculture, energy and environment concerns via…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
13Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-106 contacts →

Exact match

“Energy Shrink is an environmental consulting practice specialized in sustainability and energy efficiency in buildings, that is, high-performance or green buildings.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
14Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-106 contacts →

Exact match

“We bring decades of fundraising, organizational development and marketing and communications background to non-profit and for-profit executive leadership, CEOs, philanthropists…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
15Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-105 contacts →

Exact match

“38 North Solutions is a boutique consulting firm that provides a suite of business strategy and public policy services to innovative businesses and organizations.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
16Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-105 contacts →

Exact match

“Alt Surya is a global climate advisory firm, which provides expert consulting services to clients in Asia and North America.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
17Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-105 contacts →

Exact match

“Our team leverages deep industry expertise to help you navigate regulatory shifts and seize new opportunities in clean energy.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
18Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-104 contacts →

Exact match

“Leading and innovative company that finding solutions, bridging gaps and driving positive action for clients and the planet.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
19Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-104 contacts →

Exact match

“Echo Communications Advisors is a public affairs firm specializing in clean energy, climate, and conservation policy.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
20Exact matchWashington, United StatesHQ recorded Sep 27, 20261-104 contacts →

Exact match

“Sustainability Frameworks helps its public and private sector clients develop strategies to manage their environmental and social risks and opportunities, optimize their…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
21Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-104 contacts →

Exact match

“Range Renewable Advisors (“Range” or “Range Renewables”) is a renewable energy advisory firm focused on helping clients tackle complex financial solutions in development, project…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
22Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-104 contacts →

Exact match

“JG Global Advisory, LLC is a minority, woman-owned small business (WOSB) consultancy providing advisory services and integrated solutions for environmental and international…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
23Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-103 contacts →

Exact match

“Pagitsas Advisors is a professional services firm specializing in the commercialization of sustainability.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
24Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-102 contacts →

Exact match

“Strategic advisory services for the triple bottom line.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
25Exact matchWashington, DC, United StatesHQ recorded Sep 27, 20261-102 contacts →

Exact match

“Center for Energy Poverty and Climate allows policymakers to brainstorm solutions to difficult problems, and leverage programs to achieve net zero.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase

Showing 25 of 59 climate policy consultancies based in Washington, United States

See the full list, filter by size, metro and specialty, and access 212 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Climate policy consultancies based in Washington, United States at a glance

As of Sep 27, 2026
52.0%Verified-email coverage
6.9Average contacts per company
1-10Median size (employees)
Sep 27, 2026Page data refreshed

Companies by employee count

1-10
46
11-50
12
51-200
1

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 59 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with Washington, United States whose business descriptions match “climate policy consultancies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 212 professional contacts with verified work emails across the full matched dataset. 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 27, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “climate policy consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many climate policy consultancies are there based in Washington, United States?

RevenueBase identified 59 company matches for climate policy consultancies associated with Washington, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

CCAP tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most climate policy consultancies?

Washington leads the United States with 59 company records, followed by New York (52) and Chicago (31).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 212 professional contacts with verified work emails tracked across these 59 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 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 SmartSearch, 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.