Company lists · Data refreshed September 2026

Top 25 City sustainability consultants based in Washington, United States

Name: City sustainability consultants based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 100 companies tracked

RevenueBase identified 100 city sustainability consultants headquartered in Washington, United States as of September 2026 and tracks 1,929 professional contacts across them, including 641 with verified work emails. New York is the largest hub.

This list covers city sustainability consultants headquartered in Washington, 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

100Companies

1,929Contacts tracked

641Verified emails

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The 25 largest city sustainability consultants based in Washington, United States

Ranked by team size

Top 25 of 100 city sustainability consultants based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to city sustainability consultants: 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	Synergy Consulting, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	434 contacts →
	Indirect evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 19, 2026
2	RTKL	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1,001-5,000	351 contacts →
	Partial evidence “CRTKL has now joined Arcadis, a global leader in the delivery of sustainable design, engineering and consultancy solutions for natural and built assets.” Source: RevenueBase Database · checked Sep 19, 2026
3	Peer Consultants, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	71 contacts →
	Indirect evidence “In 1978, PEER was established under Dr.” Source: RevenueBase Database · checked Sep 19, 2026
4	Baumann Consulting	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	63 contacts →
	Indirect evidence “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Source: RevenueBase Database · checked Sep 19, 2026
5	David M. Schwarz Architects	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	40 contacts →
	Indirect evidence “David M.” Source: RevenueBase Database · checked Sep 19, 2026
6	Northbridge	Indirect evidence	Washington, United StatesHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “At Northbridge, we provide our clients with the tools and expertise to help solve complex financial, policy, and environmental challenges.” Source: RevenueBase Database · checked Sep 19, 2026
7	North Arrow, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “DUNS Number: 08-001-8268 CAGE Code: 7GN69 SBA Certified Small Business District of Columbia Certified Business Enterprise (CBE) Metropolitan Washington Airports Authority Local…” Source: RevenueBase Database · checked Sep 19, 2026
8	Ridge-Lane Limited Partners	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	21 contacts →
	Indirect evidence “RIDGE-LANE Limited Partners is a strategic advisory and venture development company founded by financier R.” Source: RevenueBase Database · checked Sep 19, 2026
9	Fillat Architecture	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “FILLAT+ is a design studio headquartered in Washington, DC with offices in Baltimore, New York and San Diego.” Source: RevenueBase Database · checked Sep 19, 2026
10	The Clark Group LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “The Clark Group is an environmental policy consulting firm that provides a broad range of services to government, private and nonprofit clients.” Source: RevenueBase Database · checked Sep 19, 2026
11	Amis Patel Brewer	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1-10	18 contacts →
	Partial evidence “Amis, Patel & Brewer, LLP is a boutique law firm focused on providing legal services to the renewable energy and sustainability sectors.” Source: RevenueBase Database · checked Sep 19, 2026
12	E&w LAW	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
13	Bell Architects, PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “BELL Architects' works closely with communities to create places where people want to be.” Source: RevenueBase Database · checked Sep 19, 2026
14	Bradley Site Design, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “Located in Washington, DC, Bradley Site Design is a dynamic Landscape Architecture, Civil Engineering and Planning firm founded in 1994 and dedicated to the creation of socially…” Source: RevenueBase Database · checked Sep 19, 2026
15	Numark Associates, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
16	Sustainable Capital Advisors	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Sustainable Capital Advisors (SCA) is a strategy consulting and financial advisory firm focused on delivering innovative capital solutions for the sustainable infrastructure…” Source: RevenueBase Database · checked Sep 19, 2026
17	Co2efficient	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1-10	14 contacts →
	Indirect evidence “CO2EFFICIENT LLC (COEFFICIENT) was founded in 2017 as a mission-focused Washington, D.C.” Source: RevenueBase Database · checked Sep 19, 2026
18	Sustainable YOU	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	14 contacts →
	Partial evidence “Sustainable You is a national strategic consulting firm in solar and sustainability serving residential and small commercial clients with a focus in the DC, Maryland and Virginia…” Source: RevenueBase Database · checked Sep 19, 2026
19	Soto Architecture & Urban Design, Pllc	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Architecture & Urban design team located in the 14th Street corridor of Washington, DC.” Source: RevenueBase Database · checked Sep 19, 2026
20	LEE And Associates, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “lee and associates, inc (lai) is a respected and highly responsive firm offering planning and design professional services as it relates to how man relates to the land and the…” Source: RevenueBase Database · checked Sep 19, 2026
21	Rebel North America	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	12 contacts →
	Indirect evidence “As one of the leading U.S.” Source: RevenueBase Database · checked Sep 19, 2026
22	Sustainable Strategies DC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1-10	11 contacts →
	Indirect evidence “Sustainable Strategies DC is a government affairs and strategic consulting firm based in Washington, DC, that helps clients secure resources for community revitalization and tools…” Source: RevenueBase Database · checked Sep 19, 2026
23	Trusted Advisory Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1-10	10 contacts →
	Partial evidence “Trusted Advisory Group is a Washington, DC based management consultant firm focused on the commercial real estate industry.” Source: RevenueBase Database · checked Sep 19, 2026
24	Global Connective Center, LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	10 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
25	Green Strategies, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Indirect evidence “Green Strategies Inc.” 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: city sustainability consultants. 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 city sustainability consultants.
Partial evidence: Its own public description names part of city sustainability consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name city sustainability consultants. 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 100 city sustainability consultants based in Washington, United States

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City sustainability consultants based in Washington, United States at a glance

As of Sep 19, 2026

33.2%Verified-email coverage

19.3Average contacts per company

1-10Median size (employees)

176.0%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

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 100 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 city sustainability consultants, 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 Washington, United States whose own description of what they do matches “city sustainability consultants”. 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 city sustainability consultants), 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 city sustainability consultants, and records with no verified work email. Companies headquartered outside Washington 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, 641 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.

City sustainability consultants 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 city sustainability consultants, 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 city sustainability consultants are there based in Washington, United States?

RevenueBase identified 100 city sustainability consultants headquartered in Washington, 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?

Synergy Consulting, INC, headquartered in Washington, tops this list with the largest team on record.

Which city has the most city sustainability consultants?

New York leads with 176 headquartered companies, followed by Washington (100) and Chicago (77).

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 641 verified decision-maker contacts tracked across these 100 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.