Company lists · Data refreshed September 2026

Top 25 Sustainable development firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 1,649 companies tracked

RevenueBase identified 1,649 company matches for sustainable development firms associated with the United States as of September 2026 and tracks 22,467 professional contacts across them, including 8,746 with verified work emails. New York is the largest hub.

This list covers company matches for sustainable development firms 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 September 22, 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 22, 2026 How this list was built

1,649Companies

22,467Contacts tracked

8,746Verified emails

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The 25 largest sustainable development firms based in the United States

Ranked by team size

Top 25 of 1,649 company matches for sustainable development firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 22, 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	Chemonics International	Exact match	Washington, DC, United StatesHQ recorded Sep 22, 2026	1,001-5,000	4,410 contacts →
	Exact match “In a world where conditions are changing faster, resources are tighter, and the path to results is increasingly complex, delivery matters more than ever.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
2	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 22, 2026	1,001-5,000	1,629 contacts →
	Exact match “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
3	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 22, 2026	n/a	1,145 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 · Sep 22, 2026 · View company records in RevenueBase
4	EBI Consulting	Exact match	Burlington, MA, United StatesHQ recorded Sep 22, 2026	501-1,000	535 contacts →
	Exact match “For 35 years we have been helping investors, lenders, owners, developers, contractors, and property managers reduce risk and optimize their built facilities, infrastructure and…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
5	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 22, 2026	201-500	383 contacts →
	Exact match “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
6	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 22, 2026	201-500	375 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
7	Takkion	Exact match	Evansville, WY, United StatesHQ recorded Sep 22, 2026	1,001-5,000	358 contacts →
	Exact match “TAKKION is Moving Energy Forward.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
8	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Sep 22, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
9	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 22, 2026	201-500	305 contacts →
	Exact match “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
10	Csrs, A Westwood Company	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 22, 2026	51-200	305 contacts →
	Exact match “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
11	Ecology And Environment, INC	Exact match	Lancaster, NY, United StatesHQ recorded Sep 22, 2026	5,001-10,000	278 contacts →
	Exact match “E&E is now WSP USA.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
12	Illumine-I	Exact match	Austin, CA, United StatesHQ recorded Sep 22, 2026	201-500	275 contacts →
	Exact match “The world runs on power.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
13	PSC Consulting	Exact match	Kirkland, WA, United StatesHQ recorded Sep 22, 2026	201-500	254 contacts →
	Exact match “We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
14	Baywa R.E. Americas	Exact match	Carlsbad, CA, United StatesHQ recorded Sep 22, 2026	201-500	244 contacts →
	Exact match “rethinkenergy BayWa r.e is a leading global renewable energy company committed to delivering best-in-class projects, services and solutions.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
15	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Sep 22, 2026	201-500	214 contacts →
	Exact match “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
16	Nexant	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 22, 2026	201-500	183 contacts →
	Exact match “Resource Innovations now combined with Nexant is a substantially woman-owned, woman-led energy consulting firm dedicated to creating equal access to clean resources through…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
17	Canacre	Exact match	Scottsdale, AZ, United StatesHQ recorded Sep 22, 2026	201-500	172 contacts →
	Exact match “Canacre is an infrastructure development consultant specializing in project management, land acquisition, environment, GIS analysis, data management, web-based mapping, community…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
18	Mackay Sposito	Exact match	Vancouver, WA, United StatesHQ recorded Sep 22, 2026	51-200	166 contacts →
	Exact match “We’re consultants in energy, public works and land development, and we’re an array of technical disciplines.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
19	Integrated Business & Technical Consultants, Inc. Ibtci	Exact match	Vienna, VA, United StatesHQ recorded Sep 22, 2026	201-500	161 contacts →
	Exact match “Integrated Business & Technical Consultants Inc.(IBTCI), a U.S.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
20	STOK	Exact match	San Francisco, CA, United StatesHQ recorded Sep 22, 2026	51-200	141 contacts →
	Exact match “Stok leads organizations to decarbonize now.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
21	Hoyle, Tanner & Associates, INC	Exact match	Manchester, NH, United StatesHQ recorded Sep 22, 2026	51-200	137 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 · Sep 22, 2026 · View company records in RevenueBase
22	Four Seasons Environmental, INC	Exact match	Monroe, OH, United StatesHQ recorded Sep 22, 2026	201-500	134 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
23	Halker	Exact match	Centennial, CO, United StatesHQ recorded Sep 22, 2026	51-200	121 contacts →
	Exact match “Halker Consulting provides custom engineered and configured services in Project Assessment and Planning, Engineering and Design, & Consulting and Implementation Guidance.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
24	Envocore	Exact match	Gambrills, MD, United StatesHQ recorded Sep 22, 2026	201-500	116 contacts →
	Exact match “We make sustainable happen.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
25	Cascadia Consulting Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 22, 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 · Sep 22, 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 firms”. 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 1,649 sustainable development firms based in the United States

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Sustainable development firms based in the United States at a glance

As of Sep 22, 2026

38.9%Verified-email coverage

13.6Average contacts per company

1-10Median size (employees)

5.5%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

1,187

11-50

340

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 1,649 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 firms” 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 8,746 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 22, 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 firms 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 firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 1,649 company matches for sustainable development firms associated with the 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?

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

Which city has the most sustainable development firms?

New York leads with 90 company records, followed by Washington (57) and Houston (46).

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 8,746 professional contacts with verified work emails tracked across these 1,649 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 22, 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.