Company lists · Data refreshed September 2026

Top 25 Environmental design firms based in the United States

Name: Environmental design 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 19, 2026 12,004 companies tracked

RevenueBase identified 12,004 company matches for environmental design firms associated with the United States as of September 2026 and tracks 220,306 professional contacts across them, including 105,766 with verified work emails. New York is the largest hub.

This list covers company matches for environmental design 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 19, 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 19, 2026 How this list was built

12,004Companies

220,306Contacts tracked

105,766Verified emails

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The 25 largest environmental design firms based in the United States

Ranked by team size

Top 25 of 12,004 company matches for environmental design firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 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	WSP In The U.S	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	10001+	9,318 contacts →
	Exact match “What if you could shape built and natural environments – and the future of those that use them?” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Perkins&will	Exact match	Chicago, IL, United StatesHQ recorded Sep 19, 2026	1,001-5,000	2,958 contacts →
	Exact match “Since 1935, we’ve believed that design has the power to make the world a better, more beautiful place.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	HOK	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	1,001-5,000	2,614 contacts →
	Exact match “HOK is a global interdisciplinary design firm.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Hks, INC	Exact match	Dallas, TX, United StatesHQ recorded Sep 19, 2026	1,001-5,000	2,462 contacts →
	Exact match “We are a global firm of architects, designers, planners and advisors who create places noted for their beauty and performance.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	DLR Group	Exact match	30 Offices, MN, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,992 contacts →
	Exact match “DLR Group is an integrated design firm delivering architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	IMEG	Exact match	Rock Island, IL, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,985 contacts →
	Exact match “Leaders in Engineering and Innovation.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	Skidmore, Owings & Merrill SOM	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,967 contacts →
	Exact match “Skidmore, Owings & Merrill (SOM) is a global practice of architects, designers, engineers, and planners, responsible for some of the world’s most technically and environmentally…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	Smithgroup	Exact match	Detroit, MI, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,849 contacts →
	Exact match “SmithGroup is an award-winning, multi-national integrated design firm that employs research, data, advanced technologies and design thinking to help clients solve their greatest…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 19, 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 19, 2026 · View company records in RevenueBase
10	IA Interior Architects	Exact match	San Francisco, CA, United StatesHQ recorded Sep 19, 2026	501-1,000	1,584 contacts →
	Exact match “Celebrating 40 years of visionary design and innovation, IA Interior Architects is the first global architecture firm focused exclusively on interiors.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	HGA	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,543 contacts →
	Exact match “HGA is a national interdisciplinary design firm committed to making a positive, lasting impact for our clients and communities through research-based, holistic solutions.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	Corgan	Exact match	Dallas, TX, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,414 contacts →
	Exact match “Corgan is an employee-owned architecture and design firm with 22 locations and more than 1,300 team members globally.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	PAGE	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,191 contacts →
	Exact match “Performance by Design.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 19, 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 19, 2026 · View company records in RevenueBase
15	Perkins Eastman	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,083 contacts →
	Exact match “Perkins Eastman is a global design practice founded on the belief that design has the power to enhance people’s lives and safeguard the environment.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	Braun Intertec Corporation	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,065 contacts →
	Exact match “At Braun Intertec, we work at the intersection of the natural and built environments, combining science, technology, and engineering.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	Ware Malcomb	Exact match	International Design Firm, United StatesHQ recorded Sep 19, 2026	501-1,000	992 contacts →
	Exact match “Established in 1972, Ware Malcomb is a dynamic, forward-thinking design firm offering streamlined architecture, interior design, branding, and engineering services across the…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	IEA	Exact match	Brooklyn Park, MN, United StatesHQ recorded Sep 19, 2026	n/a	982 contacts →
	Exact match “The Institute for Environmental Assessment, Inc.(IEA) is small business committed to providing trusted environmental safety consulting services for private and public…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	KPF	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	501-1,000	970 contacts →
	Exact match “KPF is dedicated to transforming cities through impactful design, collaborating closely with the world’s most forward-thinking clients to create high performing, carefully crafted…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Parametrix	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	501-1,000	880 contacts →
	Exact match “At Parametrix, we help our clients imagine what's possible.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	ATC Group Services LLC	Exact match	Lafayette, LA, United StatesHQ recorded Sep 19, 2026	1,001-5,000	865 contacts →
	Exact match “ATC Group Services LLC is now Atlas.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	ZGF Architects	Exact match	Portland, OR, United StatesHQ recorded Sep 19, 2026	501-1,000	829 contacts →
	Exact match “With our origins in Oregon, attention to craft and beauty is elemental to the ZGF culture.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	Nbbj Design	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	501-1,000	808 contacts →
	Exact match “NBBJ is an ideas-driven architecture and design firm dedicated to creating connected communities, healthier buildings and a more resilient environment.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	DUDEK	Exact match	Encinitas, CA, United StatesHQ recorded Sep 19, 2026	501-1,000	795 contacts →
	Exact match “Dudek is an environmental, planning, and engineering consulting firm.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25	GPD Group	Exact match	Akron, OH, United StatesHQ recorded Sep 19, 2026	501-1,000	786 contacts →
	Exact match “Founded in 1961, GPD Group (GPD) has grown from only a handful of people to over 870 professionals in 14 offices located in Akron, Atlanta, Cleveland, Columbus, Dallas…” Recorded in the RevenueBase company graph · Sep 19, 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 “environmental design 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 12,004 environmental design firms based in the United States

See the full list, filter by size, metro and specialty, and access 105,766 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Environmental design firms based in the United States at a glance

As of Sep 19, 2026

48.0%Verified-email coverage

18.4Average contacts per company

1-10Median size (employees)

4.7%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

7,293

11-50

3,635

51-200

837

201-500

131

501-1,000

1,001-5,000

5,001-10,000

10001+

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 12,004 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 “environmental design 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 105,766 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 19, 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.

Environmental design 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 “environmental design firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental design firms are there based in the United States?

RevenueBase identified 12,004 company matches for environmental design 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?

WSP In The U.S tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most environmental design firms?

New York leads with 564 company records, followed by Los Angeles (272) and Chicago (205).

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 105,766 professional contacts with verified work emails tracked across these 12,004 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 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 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.