Company lists · Data refreshed November 2026

Top 25 Sustainable development consultancies based in the United States

Name: Sustainable development consultancies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 1,259 companies tracked

RevenueBase identified 1,259 company matches for sustainable development consultancies associated with the United States as of November 2026 and tracks 10,923 professional contacts across them, including 3,509 with verified work emails. New York is the largest hub.

This list covers company matches for sustainable development consultancies associated with the 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 November 5, 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 Nov 5, 2026 How this list was built

1,259Companies

10,923Contacts tracked

3,509Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest sustainable development consultancies based in the United States

Ranked by team size

Top 25 of 1,259 company matches for sustainable development consultancies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	OLA	Exact match	Austin, TX, United StatesHQ recorded Nov 5, 2026	n/a	1,164 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Nov 5, 2026	201-500	335 contacts →
	Exact match “ECT delivers environmental solutions for essential infrastructure.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3	Csrs, A Westwood Company	Exact match	Baton Rouge, LA, United StatesHQ recorded Nov 5, 2026	51-200	270 contacts →
	Exact match “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	Keramida INC	Exact match	Indianapolis, NY, United StatesHQ recorded Nov 5, 2026	51-200	172 contacts →
	Exact match “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5	Hoyle, Tanner & Associates, INC	Exact match	Manchester, VT, United StatesHQ recorded Nov 5, 2026	51-200	145 contacts →
	Exact match “Hoyle Tanner provides our clients with integrated engineering designs that utilize sustainable and low impact development principles through innovative strategies and technologies.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	Environ Energy	Exact match	New York, NY, United StatesHQ recorded Nov 5, 2026	51-200	127 contacts →
	Exact match “Environ Energy is a leader in accelerating global sustainable energy transformation for more than 30 years.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	Cascadia Consulting Group	Exact match	Seattle, CA, United StatesHQ recorded Nov 5, 2026	51-200	110 contacts →
	Exact match “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	AKT Peerless	Exact match	Saginaw, IL, United StatesHQ recorded Nov 5, 2026	51-200	107 contacts →
	Exact match “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	Citadel EHS	Exact match	Glendale, CA, United StatesHQ recorded Nov 5, 2026	51-200	101 contacts →
	Exact match “Founded in 1993, Citadel EHS provides comprehensive environmental, health, safety, and sustainability consulting solutions to meet the needs of both the public and private sectors.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	Verdani Partners	Exact match	Carlsbad, CA, United StatesHQ recorded Nov 5, 2026	51-200	96 contacts →
	Exact match “Verdani Partners is a full service sustainability consulting firm specialized in corporate sustainability, LEED certification and greening and retrofitting existing buildings.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	Onepointfive Opf.Degree	Exact match	New York, NY, United StatesHQ recorded Nov 5, 2026	11-50	96 contacts →
	Exact match “At OnePointFive we solve your sustainability focused business challenges by empowering your organization with expert-led solutions, embedded training, and cutting edge tools to…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	Baumann Consulting	Exact match	Washington, DC, United StatesHQ recorded Nov 5, 2026	51-200	71 contacts →
	Exact match “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	WRD Environmental	Exact match	Chicago, IL, United StatesHQ recorded Nov 5, 2026	11-50	71 contacts →
	Exact match “WRD Environmental helps organizations committed to sustainability realize their vision.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	Bloomberg Associates	Exact match	New York, NY, United StatesHQ recorded Nov 5, 2026	11-50	68 contacts →
	Exact match “Bloomberg Associates is an international consulting service founded by Michael R.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Dresdner Robin	Exact match	Jersey City, NJ, United StatesHQ recorded Nov 5, 2026	51-200	67 contacts →
	Exact match “Dresdner Robin is an award-winning land-use consultancy with a specialty in urban design and development, plus brownfield redevelopment.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	Ckinetics	Exact match	Cupertino, CA, United StatesHQ recorded Nov 5, 2026	51-200	66 contacts →
	Exact match “cKinetics is a Sustainability specialist which provides: Sustainability strategy advisory services, Information products and incubation capital.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Brightworks Sustainability	Exact match	Portland, TN, United StatesHQ recorded Nov 5, 2026	51-200	61 contacts →
	Exact match “Recognized for advanced subject matter expertise, wide-ranging technical resources, creative problem-solving, and excellence in professional practice, Brightworks Sustainability…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18	3r Sustainability	Exact match	Pittsburgh, PA, United StatesHQ recorded Nov 5, 2026	11-50	61 contacts →
	Exact match “3R Sustainability is a women-owned business providing consulting services rooted in science, supported by data, and driven by innovation, education, and continual improvement…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	Spectreco	Exact match	Atlanta, GA, United StatesHQ recorded Nov 5, 2026	11-50	57 contacts →
	Exact match “At Spectreco, our ethos revolves around simplicity, speed, sprint, and trust.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	Sustainable Building Partners	Exact match	Fairfax, VA, United StatesHQ recorded Nov 5, 2026	11-50	56 contacts →
	Exact match “Sustainable Building Partners (SBP) offers building professionals and end-users precise energy efficiency and sustainable solutions for new and existing assets.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21	Marstel-Day, LLC	Exact match	Fredericksburg, VA, United StatesHQ recorded Nov 5, 2026	51-200	56 contacts →
	Exact match “Marstel-Day is a small business working to solve today’s complex environmental and sustainability challenges around the world.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	Coho, An ERM Group Company	Exact match	Bethesda, MD, United StatesHQ recorded Nov 5, 2026	51-200	55 contacts →
	Exact match “Coho, an ERM Group company, is a global climate adviser dedicated to helping clients navigate complexity and take ambitious steps on their climate journey.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23	Ecodit	Exact match	Mclean, VA, United StatesHQ recorded Nov 5, 2026	n/a	55 contacts →
	Exact match “ECODIT is dedicated to working with governments, businesses, and local communities around the world to advance environmentally- and socially- responsible development.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24	Meridian Institute	Exact match	Washington Dc, United StatesHQ recorded Nov 5, 2026	51-200	55 contacts →
	Exact match “We are a mission-driven, nonprofit consultancy.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25	Institute For Local Self-Reliance	Exact match	Washington, MN, United StatesHQ recorded Nov 5, 2026	11-50	49 contacts →
	Exact match “The Institute for Local Self-Reliance (ILSR) is a nonprofit research and educational organization that provides technical assistance and information on sustainable development…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “sustainable development consultancies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 1,259 sustainable development consultancies based in the United States

See the full list, filter by size, metro and specialty, and access 3,509 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Sustainable development consultancies based in the United States at a glance

As of Nov 5, 2026

32.1%Verified-email coverage

8.7Average contacts per company

1-10Median size (employees)

8.4%Largest-city concentration · New York

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

979

11-50

213

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,259 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 the United States whose business descriptions match “sustainable development 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 3,509 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 November 5, 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.

Sustainable development consultancies by metro

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 “sustainable development consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable development consultancies are there based in the United States?

RevenueBase identified 1,259 company matches for sustainable development consultancies associated with the United States as of November 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?

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

Which city has the most sustainable development consultancies?

New York leads with 106 company records, followed by Washington (65) and Los Angeles (36).

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 3,509 professional contacts with verified work emails tracked across these 1,259 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 November 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,259 sustainable development consultancies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Sustainable development consultancies by geography

Browse the directory

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.